Mitsubishi MELSEC-F FX2N Series User manual

This manual contains text, diagrams and explanations which will guide the reader in the correct installation and
operation of the FX2N-4AD and should be read and understood before attempting to install or use the unit.
Further information can be found in the FX SERIES PROGRAMMING MANUAL, FX2N SERIES HARDWARE MANUAL .
•The FX2N-4AD analog special function block has four input channels. The input channels receive analog signals
and convert them into a digital value. This is called an A/D conversion. The FX2N-4AD has maximum resolution of
12 bits.
•The selection of voltage or current based input/output is by user wiring. Analog ranges of -10 to 10V DC (resolution:
5mV), and/or 4 to 20mA, -20 to 20mA(resolution: 20µA) may be selected.
•Data transfer between the FX2N-4AD and the FX2N main unit is by buffer memory exchange. There are 32 buffer
memories (each of 16 bits) in the FX2N-4AD.
•The FX2N-4AD occupies 8 points of I/O on the FX2N expansion bus. The 8 points can be allocated from either inputs
or outputs. The FX2N-4AD draws 30mA from the 5V rail of the FX2N main unit or powered extension unit.
1.1 EXTERNAL DIMENSIONS
Weight : Approx. 0.3 kg (0.66 lbs) Dimensions : mm (inches)
➀The analog input is received through a twisted pair
shielded cable. This cable should be wired separately
from power lines or any other lines which may induce
electrical noise.
➁If a voltage ripple occurs during input, or there is
electrically induced noise on the external wiring, connect a
smoothing capacitor of 0.1 to 0.47µF, 25V.
➂If you are using current input, connect the V+ and I+
terminals to each other.
➃If there is excessive electrical noise, connect the FG frame
ground terminal with the grounded terminal on the
FX2N-4AD.
➄Connect the ground terminal on the FX2N-4AD unit with the
grounded terminal on the main unit. Use class 3
grounding on the main unit, if available.
POWER
A/D
24V
55(2.17)
90(3.54)
4
87(3.43)
FX2N-4AD
55(2.17)
80(3.15)
I+
VI-
V+
I+
VI-
CH4
CH3
CH2
CH1
V+
I+V+
I+
V+
24+
24-
VI- VI- FG
FG
FG
9(0.35) 4
Mounting holes
4.5mm(0.18)dia.
DIN rail
Mounting slot
35mm(1.38)
Extension cable
and connector A/D LED 24V LED
Terminal screws M3(0.12)
CH1
V+
24+
24-
VI-
3.1 Environment specification
Item Specification
Environmental specifications (excluding following) Same as those for the FX2N main unit
Dielectric withstand voltage 500VAC, 1min (between all terminals and ground)
3.2 Power supply specification
Item Specification
Analog circuits 24V DC ±10%, 55mA
(external power supply from main unit)
Digital circuits 5V DC, 30mA (internal powersupply from main unit)
PC
V+
FG
I+
VI-
Voltage input
-10V to +10V
V+
FG
I+
VI-
Current input
-20mA to +20mA
24-
24+
100KW
100KW
250W
250W
100KW
100KW CH4
CH1
+15V
AG
-15V
AG
CH4
CH1
1
Shielded
2
3
4
5
1
Shielded
Class 3
Grounding
(100Wor less) Extension cable
FX2N-4AD
Analog Input Block
DC24V 55mA DC/DC
converter
3.3 Performance specification
Analog Inputs
Item Voltage input Current input
Either voltage or current input can be selected with your choice of input terminal. Up to four
input points can be used at one time.
Analog input range DC -10V to +10V (input resistance: 200kΩ). Warning: this unit may be damaged by input
voltage in excess of ±15V.
DC -20mA to +20mA (input resistance:
250Ω). Warning: this unit may be damaged
by input currents in excess of ±32mA.
Digital output 12-bit conversion stored in 16-bit 2’s complement form.
Maximum value: +2047 Minimum value: -2048
Resolution 5mV (10V default range 1/2000) 20µA (20mA default range 1/1000)
Over all accuracy ±1% (for the range of -10V to +10V) ±1% (for the range of -20mA to +20mA)
Conversion speed 15ms/channel (Normal speed), 6ms/channel (High speed)
Analog Inputs continued...
Preset 0 (-10V to +10V) Preset 1 (+4mA to +20mA) Preset 2 (-20mA to +20mA)
NOTE: Preset ranges are selected by an appropriate setting in buffer memory of the analog block.
Current/Voltage input selection must match the correct input terminal connections.
Miscellaneous
Item Specification
Isolation Photo-coupler isolation between analog and digital circuits.
DC/DC converter isolation of power from FX2N MPU.
No isolation between analog channels.
Number of occupied I/O points 8 points taken from the FX2N expansion bus
(can be either inputs or outputs)
3.4 Allocation of buffer memories (BFM)
In buffer memory locations (BFMs)
marked with an “*” data can be written
from the PC using the TO command.
For buffer memories (BFMs) without “*”
mark, data can be read to the PC using
the FROM command.
Before reading from the analog special
function block, ensure these settings
have been sent to the analog special
function block. Otherwise, the previous
values held in the analog block will be
used.
The buffer memory also gives a facility
to adjust offset and gain by software.
Offset (intercept): The analog input
value when the digital output becomes 0.
Gain (slope): The analog input value
when the digital output becomes +1000.
(1) Channel Selection
Channel initialization is made by a 4 character HEX number HOOOO inbuffer memory BFM #0.
The least significant character controls channel 1 and the 4 character controls channel 4.
Setting of each character is as follows:
O = 0: Preset range (-10V to +10V) O = 2: Preset range (-20mA to +20mA)
O = 1: Preset range (+4mA to +20mA) O = 3: Channel OFF
Example: H3310
CH1: Preset range (-10V to +10V)
CH2: Preset range (+4mA to +20mA)
CH3, CH4: Channel OFF
(2) Analog to Digital Conversion Speed Change
By writing 0 or 1 into BFM #15 of the FX2N-4AD, the speed at which A/D conversion is performed can be changed.
However the following points should be noted:
To maintain a high speed conversion rate, use the FROM/TO commands as seldom as possible.
NOTES: When a conversion speed change is made, BFM #1-#4 are set to their default values immediately after the
change. This is regardless of the values they held originally. Bear this in mind if a speed change will be
made as part of the normal program execution.
(3) Adjusting Gain and Offset values
(a) When buffer memory BFM #20 is activated by setting it to K1, all settings within the analog special function
block are reset to their default settings. This is a very quick method to erase any undesired gain and offset
adjustments.
(b) If (b1, b0) of BFM #21 is set to (1,0), gain and offset adjustments are prohibited to prevent inadvertent changes
by the operator. In order to adjust the gain and offset values, bits (b1, b0) must be set to (0,1). The default is
(0,1).
(c) Gain and offset values of BFM #23 and #24 are sent to non-volatile memory gain and offset registers of the
specified input channels. Input channels to be adjusted are specified by the appropriate G-O (gain-offset) bits
of BFM #22
Example: If bits G1 and O1 are set to 1, input channel 1 will be adjusted when BFM #22 is written to by a TO
instruction.
(d) Channels can be adjusted individually or together with the same gain and offset values.
(e) Gain and offset values in BFM #23 #24 are in units of mV or µA. Due to the resolution of the unit the actual
response will be in steps of 5mV or 20µA.
FX2N-4AD SPECIAL FUNCTION BLOCK
USER’S GUIDE
JY992D65201A
TERMINAL LAYOUTS
2
BFM Contents
*#0 Channel initialization Default = H0000
*#1 Channel 1 Contains the number of samples (1 to
4096) to be used for an averaged result.
The default setting is 8-normal speed. High
speed operation can be selected with a
value of 1.
*#2 Channel 2
*#3 Channel 3
*#4 Channel 4
#5 Channel 1 These buffer memories contain the
averaged input values for the number of
samples entered for the channel in buffer
memories #1 to #4 respectively.
#6 Channel 2
#7 Channel 3
#8 Channel 4
#9 Channel 1 These buffer memories contain the present
value currently being read by each input
channel.
#10 Channel 2
#11 Channel 3
#12 Channel 4
#13-#14 Reserved
#15 Selection of A/D conversion
speed see note 2
When set to 0, a normal speed is selected
of 15ms/ch (default)
When set to 1, a high speed is selected of
6ms/ch
BFM b7 b6 b5 b4 b3 b2 b1 b0
#16-#19 Reserved
*#20 Reset to Defaults and Preset. Default = 0
*#21 Offset, Gain Adjust Prohibit. Default = (0, 1) Permit
*#22 Offset, Gain Adjust G4 O4 G3 O3 G2 O2 G1 O1
*#23 Offset Value Default = 0
*#24 Gain Value Default = 5,000
#25-#28 Reserved
#29 Error status
#30 Identification code K2010
#31 Cannot be used
Voltage input
Digital output
-2,000
-2,048
-10.240V
+2,000 +2,047
+10.235V
+10V
-10V
+1,750
+1,000
Current input
Digital
output
+32mA
+20mA+4mA0 Current input
Digital
output
-1,000
-1,600
-32mA
+1,000
+1,600
+32mA
+20mA
-20mA
INTRODUCTION
1
INSTALLATION NOTES AND USAGE
3
www.datasheet4u.com

This manual contains text, diagrams and explanations which will guide the reader in the correct installation and
operation of the FX2N-4AD and should be read and understood before attempting to install or use the unit.
Further information can be found in the FX SERIES PROGRAMMING MANUAL, FX2N SERIES HARDWARE MANUAL .
•The FX2N-4AD analog special function block has four input channels. The input channels receive analog signals
and convert them into a digital value. This is called an A/D conversion. The FX2N-4AD has maximum resolution of
12 bits.
•The selection of voltage or current based input/output is by user wiring. Analog ranges of -10 to 10V DC (resolution:
5mV), and/or 4 to 20mA, -20 to 20mA(resolution: 20µA) may be selected.
•Data transfer between the FX2N-4AD and the FX2N main unit is by buffer memory exchange. There are 32 buffer
memories (each of 16 bits) in the FX2N-4AD.
•The FX2N-4AD occupies 8 points of I/O on the FX2N expansion bus. The 8 points can be allocated from either inputs
or outputs. The FX2N-4AD draws 30mA from the 5V rail of the FX2N main unit or powered extension unit.
1.1 EXTERNAL DIMENSIONS
Weight : Approx. 0.3 kg (0.66 lbs) Dimensions : mm (inches)
➀The analog input is received through a twisted pair
shielded cable. This cable should be wired separately
from power lines or any other lines which may induce
electrical noise.
➁If a voltage ripple occurs during input, or there is
electrically induced noise on the external wiring, connect a
smoothing capacitor of 0.1 to 0.47µF, 25V.
➂If you are using current input, connect the V+ and I+
terminals to each other.
➃If there is excessive electrical noise, connect the FG frame
ground terminal with the grounded terminal on the
FX2N-4AD.
➄Connect the ground terminal on the FX2N-4AD unit with the
grounded terminal on the main unit. Use class 3
grounding on the main unit, if available.
POWER
A/D
24V
55(2.17)
90(3.54)
4
87(3.43)
FX2N-4AD
55(2.17)
80(3.15)
I+
VI-
V+
I+
VI-
CH4
CH3
CH2
CH1
V+
I+V+
I+
V+
24+
24-
VI- VI- FG
FG
FG
9(0.35) 4
Mounting holes
4.5mm(0.18)dia.
DIN rail
Mounting slot
35mm(1.38)
Extension cable
and connector A/D LED 24V LED
Terminal screws M3(0.12)
CH1
V+
24+
24-
VI-
3.1 Environment specification
Item Specification
Environmental specifications (excluding following) Same as those for the FX2N main unit
Dielectric withstand voltage 500VAC, 1min (between all terminals and ground)
3.2 Power supply specification
Item Specification
Analog circuits 24V DC ±10%, 55mA
(external power supply from main unit)
Digital circuits 5V DC, 30mA (internal powersupply from main unit)
PC
V+
FG
I+
VI-
Voltage input
-10V to +10V
V+
FG
I+
VI-
Current input
-20mA to +20mA
24-
24+
100KW
100KW
250W
250W
100KW
100KW CH4
CH1
+15V
AG
-15V
AG
CH4
CH1
1
Shielded
2
3
4
5
1
Shielded
Class 3
Grounding
(100Wor less) Extension cable
FX2N-4AD
Analog Input Block
DC24V 55mA DC/DC
converter
3.3 Performance specification
Analog Inputs
Item Voltage input Current input
Either voltage or current input can be selected with your choice of input terminal. Up to four
input points can be used at one time.
Analog input range DC -10V to +10V (input resistance: 200kΩ). Warning: this unit may be damaged by input
voltage in excess of ±15V.
DC -20mA to +20mA (input resistance:
250Ω). Warning: this unit may be damaged
by input currents in excess of ±32mA.
Digital output 12-bit conversion stored in 16-bit 2’s complement form.
Maximum value: +2047 Minimum value: -2048
Resolution 5mV (10V default range 1/2000) 20µA (20mA default range 1/1000)
Over all accuracy ±1% (for the range of -10V to +10V) ±1% (for the range of -20mA to +20mA)
Conversion speed 15ms/channel (Normal speed), 6ms/channel (High speed)
Analog Inputs continued...
Preset 0 (-10V to +10V) Preset 1 (+4mA to +20mA) Preset 2 (-20mA to +20mA)
NOTE: Preset ranges are selected by an appropriate setting in buffer memory of the analog block.
Current/Voltage input selection must match the correct input terminal connections.
Miscellaneous
Item Specification
Isolation Photo-coupler isolation between analog and digital circuits.
DC/DC converter isolation of power from FX2N MPU.
No isolation between analog channels.
Number of occupied I/O points 8 points taken from the FX2N expansion bus
(can be either inputs or outputs)
3.4 Allocation of buffer memories (BFM)
In buffer memory locations (BFMs)
marked with an “*” data can be written
from the PC using the TO command.
For buffer memories (BFMs) without “*”
mark, data can be read to the PC using
the FROM command.
Before reading from the analog special
function block, ensure these settings
have been sent to the analog special
function block. Otherwise, the previous
values held in the analog block will be
used.
The buffer memory also gives a facility
to adjust offset and gain by software.
Offset (intercept): The analog input
value when the digital output becomes 0.
Gain (slope): The analog input value
when the digital output becomes +1000.
(1) Channel Selection
Channel initialization is made by a 4 character HEX number HOOOO inbuffer memory BFM #0.
The least significant character controls channel 1 and the 4 character controls channel 4.
Setting of each character is as follows:
O = 0: Preset range (-10V to +10V) O = 2: Preset range (-20mA to +20mA)
O = 1: Preset range (+4mA to +20mA) O = 3: Channel OFF
Example: H3310
CH1: Preset range (-10V to +10V)
CH2: Preset range (+4mA to +20mA)
CH3, CH4: Channel OFF
(2) Analog to Digital Conversion Speed Change
By writing 0 or 1 into BFM #15 of the FX2N-4AD, the speed at which A/D conversion is performed can be changed.
However the following points should be noted:
To maintain a high speed conversion rate, use the FROM/TO commands as seldom as possible.
NOTES: When a conversion speed change is made, BFM #1-#4 are set to their default values immediately after the
change. This is regardless of the values they held originally. Bear this in mind if a speed change will be
made as part of the normal program execution.
(3) Adjusting Gain and Offset values
(a) When buffer memory BFM #20 is activated by setting it to K1, all settings within the analog special function
block are reset to their default settings. This is a very quick method to erase any undesired gain and offset
adjustments.
(b) If (b1, b0) of BFM #21 is set to (1,0), gain and offset adjustments are prohibited to prevent inadvertent changes
by the operator. In order to adjust the gain and offset values, bits (b1, b0) must be set to (0,1). The default is
(0,1).
(c) Gain and offset values of BFM #23 and #24 are sent to non-volatile memory gain and offset registers of the
specified input channels. Input channels to be adjusted are specified by the appropriate G-O (gain-offset) bits
of BFM #22
Example: If bits G1 and O1 are set to 1, input channel 1 will be adjusted when BFM #22 is written to by a TO
instruction.
(d) Channels can be adjusted individually or together with the same gain and offset values.
(e) Gain and offset values in BFM #23 #24 are in units of mV or µA. Due to the resolution of the unit the actual
response will be in steps of 5mV or 20µA.
FX2N-4AD SPECIAL FUNCTION BLOCK
USER’S GUIDE
JY992D65201A
TERMINAL LAYOUTS
2
BFM Contents
*#0 Channel initialization Default = H0000
*#1 Channel 1 Contains the number of samples (1 to
4096) to be used for an averaged result.
The default setting is 8-normal speed. High
speed operation can be selected with a
value of 1.
*#2 Channel 2
*#3 Channel 3
*#4 Channel 4
#5 Channel 1 These buffer memories contain the
averaged input values for the number of
samples entered for the channel in buffer
memories #1 to #4 respectively.
#6 Channel 2
#7 Channel 3
#8 Channel 4
#9 Channel 1 These buffer memories contain the present
value currently being read by each input
channel.
#10 Channel 2
#11 Channel 3
#12 Channel 4
#13-#14 Reserved
#15 Selection of A/D conversion
speed see note 2
When set to 0, a normal speed is selected
of 15ms/ch (default)
When set to 1, a high speed is selected of
6ms/ch
BFM b7 b6 b5 b4 b3 b2 b1 b0
#16-#19 Reserved
*#20 Reset to Defaults and Preset. Default = 0
*#21 Offset, Gain Adjust Prohibit. Default = (0, 1) Permit
*#22 Offset, Gain Adjust G4 O4 G3 O3 G2 O2 G1 O1
*#23 Offset Value Default = 0
*#24 Gain Value Default = 5,000
#25-#28 Reserved
#29 Error status
#30 Identification code K2010
#31 Cannot be used
Voltage input
Digital output
-2,000
-2,048
-10.240V
+2,000 +2,047
+10.235V
+10V
-10V
+1,750
+1,000
Current input
Digital
output
+32mA
+20mA+4mA0 Current input
Digital
output
-1,000
-1,600
-32mA
+1,000
+1,600
+32mA
+20mA
-20mA
INTRODUCTION
1
INSTALLATION NOTES AND USAGE
3
www.datasheet4u.com

This manual contains text, diagrams and explanations which will guide the reader in the correct installation and
operation of the FX2N-4AD and should be read and understood before attempting to install or use the unit.
Further information can be found in the FX SERIES PROGRAMMING MANUAL, FX2N SERIES HARDWARE MANUAL .
•The FX2N-4AD analog special function block has four input channels. The input channels receive analog signals
and convert them into a digital value. This is called an A/D conversion. The FX2N-4AD has maximum resolution of
12 bits.
•The selection of voltage or current based input/output is by user wiring. Analog ranges of -10 to 10V DC (resolution:
5mV), and/or 4 to 20mA, -20 to 20mA(resolution: 20µA) may be selected.
•Data transfer between the FX2N-4AD and the FX2N main unit is by buffer memory exchange. There are 32 buffer
memories (each of 16 bits) in the FX2N-4AD.
•The FX2N-4AD occupies 8 points of I/O on the FX2N expansion bus. The 8 points can be allocated from either inputs
or outputs. The FX2N-4AD draws 30mA from the 5V rail of the FX2N main unit or powered extension unit.
1.1 EXTERNAL DIMENSIONS
Weight : Approx. 0.3 kg (0.66 lbs) Dimensions : mm (inches)
➀The analog input is received through a twisted pair
shielded cable. This cable should be wired separately
from power lines or any other lines which may induce
electrical noise.
➁If a voltage ripple occurs during input, or there is
electrically induced noise on the external wiring, connect a
smoothing capacitor of 0.1 to 0.47µF, 25V.
➂If you are using current input, connect the V+ and I+
terminals to each other.
➃If there is excessive electrical noise, connect the FG frame
ground terminal with the grounded terminal on the
FX2N-4AD.
➄Connect the ground terminal on the FX2N-4AD unit with the
grounded terminal on the main unit. Use class 3
grounding on the main unit, if available.
POWER
A/D
24V
55(2.17)
90(3.54)
4
87(3.43)
FX2N-4AD
55(2.17)
80(3.15)
I+
VI-
V+
I+
VI-
CH4
CH3
CH2
CH1
V+
I+V+
I+
V+
24+
24-
VI- VI- FG
FG
FG
9(0.35) 4
Mounting holes
4.5mm(0.18)dia.
DIN rail
Mounting slot
35mm(1.38)
Extension cable
and connector A/D LED 24V LED
Terminal screws M3(0.12)
CH1
V+
24+
24-
VI-
3.1 Environment specification
Item Specification
Environmental specifications (excluding following) Same as those for the FX2N main unit
Dielectric withstand voltage 500VAC, 1min (between all terminals and ground)
3.2 Power supply specification
Item Specification
Analog circuits 24V DC ±10%, 55mA
(external power supply from main unit)
Digital circuits 5V DC, 30mA (internal powersupply from main unit)
PC
V+
FG
I+
VI-
Voltage input
-10V to +10V
V+
FG
I+
VI-
Current input
-20mA to +20mA
24-
24+
100KW
100KW
250W
250W
100KW
100KW CH4
CH1
+15V
AG
-15V
AG
CH4
CH1
1
Shielded
2
3
4
5
1
Shielded
Class 3
Grounding
(100Wor less) Extension cable
FX2N-4AD
Analog Input Block
DC24V 55mA DC/DC
converter
3.3 Performance specification
Analog Inputs
Item Voltage input Current input
Either voltage or current input can be selected with your choice of input terminal. Up to four
input points can be used at one time.
Analog input range DC -10V to +10V (input resistance: 200kΩ). Warning: this unit may be damaged by input
voltage in excess of ±15V.
DC -20mA to +20mA (input resistance:
250Ω). Warning: this unit may be damaged
by input currents in excess of ±32mA.
Digital output 12-bit conversion stored in 16-bit 2’s complement form.
Maximum value: +2047 Minimum value: -2048
Resolution 5mV (10V default range 1/2000) 20µA (20mA default range 1/1000)
Over all accuracy ±1% (for the range of -10V to +10V) ±1% (for the range of -20mA to +20mA)
Conversion speed 15ms/channel (Normal speed), 6ms/channel (High speed)
Analog Inputs continued...
Preset 0 (-10V to +10V) Preset 1 (+4mA to +20mA) Preset 2 (-20mA to +20mA)
NOTE: Preset ranges are selected by an appropriate setting in buffer memory of the analog block.
Current/Voltage input selection must match the correct input terminal connections.
Miscellaneous
Item Specification
Isolation Photo-coupler isolation between analog and digital circuits.
DC/DC converter isolation of power from FX2N MPU.
No isolation between analog channels.
Number of occupied I/O points 8 points taken from the FX2N expansion bus
(can be either inputs or outputs)
3.4 Allocation of buffer memories (BFM)
In buffer memory locations (BFMs)
marked with an “*” data can be written
from the PC using the TO command.
For buffer memories (BFMs) without “*”
mark, data can be read to the PC using
the FROM command.
Before reading from the analog special
function block, ensure these settings
have been sent to the analog special
function block. Otherwise, the previous
values held in the analog block will be
used.
The buffer memory also gives a facility
to adjust offset and gain by software.
Offset (intercept): The analog input
value when the digital output becomes 0.
Gain (slope): The analog input value
when the digital output becomes +1000.
(1) Channel Selection
Channel initialization is made by a 4 character HEX number HOOOO inbuffer memory BFM #0.
The least significant character controls channel 1 and the 4 character controls channel 4.
Setting of each character is as follows:
O = 0: Preset range (-10V to +10V) O = 2: Preset range (-20mA to +20mA)
O = 1: Preset range (+4mA to +20mA) O = 3: Channel OFF
Example: H3310
CH1: Preset range (-10V to +10V)
CH2: Preset range (+4mA to +20mA)
CH3, CH4: Channel OFF
(2) Analog to Digital Conversion Speed Change
By writing 0 or 1 into BFM #15 of the FX2N-4AD, the speed at which A/D conversion is performed can be changed.
However the following points should be noted:
To maintain a high speed conversion rate, use the FROM/TO commands as seldom as possible.
NOTES: When a conversion speed change is made, BFM #1-#4 are set to their default values immediately after the
change. This is regardless of the values they held originally. Bear this in mind if a speed change will be
made as part of the normal program execution.
(3) Adjusting Gain and Offset values
(a) When buffer memory BFM #20 is activated by setting it to K1, all settings within the analog special function
block are reset to their default settings. This is a very quick method to erase any undesired gain and offset
adjustments.
(b) If (b1, b0) of BFM #21 is set to (1,0), gain and offset adjustments are prohibited to prevent inadvertent changes
by the operator. In order to adjust the gain and offset values, bits (b1, b0) must be set to (0,1). The default is
(0,1).
(c) Gain and offset values of BFM #23 and #24 are sent to non-volatile memory gain and offset registers of the
specified input channels. Input channels to be adjusted are specified by the appropriate G-O (gain-offset) bits
of BFM #22
Example: If bits G1 and O1 are set to 1, input channel 1 will be adjusted when BFM #22 is written to by a TO
instruction.
(d) Channels can be adjusted individually or together with the same gain and offset values.
(e) Gain and offset values in BFM #23 #24 are in units of mV or µA. Due to the resolution of the unit the actual
response will be in steps of 5mV or 20µA.
FX2N-4AD SPECIAL FUNCTION BLOCK
USER’S GUIDE
JY992D65201A
TERMINAL LAYOUTS
2
BFM Contents
*#0 Channel initialization Default = H0000
*#1 Channel 1 Contains the number of samples (1 to
4096) to be used for an averaged result.
The default setting is 8-normal speed. High
speed operation can be selected with a
value of 1.
*#2 Channel 2
*#3 Channel 3
*#4 Channel 4
#5 Channel 1 These buffer memories contain the
averaged input values for the number of
samples entered for the channel in buffer
memories #1 to #4 respectively.
#6 Channel 2
#7 Channel 3
#8 Channel 4
#9 Channel 1 These buffer memories contain the present
value currently being read by each input
channel.
#10 Channel 2
#11 Channel 3
#12 Channel 4
#13-#14 Reserved
#15 Selection of A/D conversion
speed see note 2
When set to 0, a normal speed is selected
of 15ms/ch (default)
When set to 1, a high speed is selected of
6ms/ch
BFM b7 b6 b5 b4 b3 b2 b1 b0
#16-#19 Reserved
*#20 Reset to Defaults and Preset. Default = 0
*#21 Offset, Gain Adjust Prohibit. Default = (0, 1) Permit
*#22 Offset, Gain Adjust G4 O4 G3 O3 G2 O2 G1 O1
*#23 Offset Value Default = 0
*#24 Gain Value Default = 5,000
#25-#28 Reserved
#29 Error status
#30 Identification code K2010
#31 Cannot be used
Voltage input
Digital output
-2,000
-2,048
-10.240V
+2,000 +2,047
+10.235V
+10V
-10V
+1,750
+1,000
Current input
Digital
output
+32mA
+20mA+4mA0 Current input
Digital
output
-1,000
-1,600
-32mA
+1,000
+1,600
+32mA
+20mA
-20mA
INTRODUCTION
1
INSTALLATION NOTES AND USAGE
3
www.datasheet4u.com

(4) Status Information BFM #29
Bit devices of BFM #29 ON OFF
b0 : Error When any of b1 to b4 is ON. If any of b2 to b4 is ON, A/D conversion of
all the channels is stopped No error
b1 : Offset / gain error Offset/Gain data in EEPROM is corrupted
or adjustment error. Offset/Gain data normal
b2 : Power source abnormality 24V DC power supply failure Power supply normal
b3 : Hardware error A/D converter or other hardware failure Hardware Normal
b10 : Digital range error Digital output value is less than -2048 or
more than +2047 Digital output value is normal.
b11: Averaging error Number of averaging samples is 4097 or
more or 0 or less (default of 8 will be used) Averaging is normal. (between 1 and 4096)
b12: Offset / gain adjust prohibit Prohibit-(b1, b0) of BFM #21 is set to (1, 0) Permit-(b1, b0) of BFM #21 is set to (0,1)
NOTE: b4 to b7, b9 and b13 to b15 are undefined.
(5) Identification Code BFM #30
The identification (or ID) code number for a Special Function Block is read using the FROM command.
This number for the FX2N-4AD unit is K2010.
The user’s program in the PC can use this facility in the program to identify the special function block before
commencing data transfer from and to the special function block.
CAUTION
•Values of BFM #0, #23 and #24 are copied to EEPROM memory of the FX2N-4AD. BFM #21 and BFM #22
are only copied when data is written to the gain/offset command buffer BFM #22. Also, BFM #20 causes
writing to the EEPROM memory. The EEPROM has a life of about 10,000 cycles (changes), so do not
use programs which frequently change these BFMs.
•Because of the time needed to write to the EEPROM memory, a delay of 300 ms is required between
instructions that cause a write to the EEPROM.
Therefore, a delay timer should be used before writing to the EEPROM a second time.
Offset and gain can be set independently or together. Reasonable offset ranges are -5 to +5V or -20mA to 20mA, and
gain values 1V to 15V or 4mA to 32mA. Gain and offset can be adjusted by software in the FX2N main unit (see
program example 2)
•Bit device’s b1, b2 of the gain/offset BFM #21 should be set to 0, 1 to allow adjustment.
•Once adjustment is complete these bit devices should be set to 1, 0 to prohibit any further changes.
•Channel initialization (BFM #0) should be set to the nearest range, i. e. voltage/current etc.
5.1 Basic Program
In the following example channels CH1 and CH2 are used as voltage inputs. The FX2N-4AD block is connected at the
position of special function block No.0. Averaging is set at 4 and data registers D0 and D1 of the PC receive the
averaged digital data.
The ID code for the special function block at position “0" is read
from BFM #30 of that block and stored at D4 in the main unit.
This is compared to check the block is a FX2N-4AD, if OK M1 is
turned ON. These two program steps are not strictly needed to
perform an analog read. They are however a useful check and
are recommended as good practice.
The analog input channels (CH1, CH2) are setup by writing
H3300 to BFM #0 of the FX2N-4AD.
The number of averaged samples for CH1 and CH2 is set to 4 by
writing 4 to BFM #1 and #2 respectively.
The operational status of the FX2N-4AD is read from BFM #29
and output as bit devices at the FX2N main unit.
If there are no errors in the operation of the FX2N-4AD, then the
averaged data BFM’s are read.
In the case of this example BFM #5 and #6 are read into the FX2N
main unit and stored at D0 and D1. These devices contain the
averaged data for CH1 and CH2 respectively.
5.2 Using gain and offset in a program
The gain and offset of the FX2N-4AD can be adjusted using push-button switches on the input terminal of the PC. It can
also be adjusted using software settings sent from the PC.
Only the gain and offset values in the memory of the FX2N-4AD need be adjusted. A voltmeter or an ammeter for the
analog input is not needed. A program for the PC will be needed however.
The following is an example of changing the offset value on input channel CH1 to 0V and the gain value to 2.5V.
The FX2N-4AD block is in the position of block No.0 (i.e. closest to the FX2N main unit).
Example: Adjusting gain/offset via software settings
Adjustment start.
(H0000) →BFM #0 (initialize input channels)
Enter the instructions on the left and RUN the PC.
(K1) →BFM #21
BFM #21 (gain/offset adjust prohibit) must be set to permit with
(b1, b0) = (0,1).
(K0) →BFM #22 (offset/gain adjust)
Reset adjust bits.
(K0) →BFM #23 (offset)
(K2500) →BFM #24 (gain)
(H0003) →BFM #22 (offset/gain adjust)
3 = 0011 i.e. O1 = 1, G1 = 1.
Therefore channel 1 is adjusted.
Adjustment end.
(K2) →BFM #21
BFM #21 gain/offset adjust prohibit.
6.1 _Preliminary checks
I. Check whether the input wiring and/or extension cables are properly connected on FX2N-4AD analog special function
block
II. Check that the FX2N system configuration rules have not been broken, i.e. the number of special function blocks
does not exceed 8 and the total system I/O is equal or less than 256 I/O.
III. Ensure that the correct operating range has been selected for the application.
IV. Check that there is no power overload on either the 5V or 24V power sources, remember the loading on a FX2N
main unit or a powered extension unit varies according to the number of extension blocks or special function
blocks connected.
V. Put the FX2N main unit into RUN.
6.2 Error checking
If the FX2N-4AD special function block does not seem to operate normally, check the following items.
•Check the status of the POWER LED.
Lit : The extension cable is properly connected.
Otherwise : Check the connection of the extension cable.
•Check the external wiring.
•Check the status fo the “24V” LED (top right corner of the FX2N-4AD).
Lit : FX2N-4AD is OK, 24V DC power source is OK.
Otherwise : Possible 24VDC power failure, if OK possible FX2N-4AD failure.
•Check the status fo the “A/D” LED (top right corner of the FX2N-4AD).
Lit : A/D conversion is proceeding normally.
Otherwise : Check buffer memory #29 (error status). If any bits (b2 and b3) are ON, then this is why
the A/D LED is OFF.
Guidelines for the safety of the user and protection of the FX2N-4AD special function block
•This manual has been written to be used by trained and competent personnel. This is defined by
the European directives for machinery, low voltage and EMC.
•If in doubt at any stage during the installation of the FX2N-24AD always consult a professional
electrical engineer who is qualified and trained to the local and national standards. If in doubt
about the operation or use of the FX2N-4AD please consult the nearest Mitsubishi Electric
distributor.
•Under no circumstances will Mitsubishi Electric be liable or responsible for any consequential
damage that may arise as a result of the installation or use of this equipment.
•All examples and diagrams shown in this manual are intended only as an aid to understanding
the text, not to guarantee operation. Mitsubishi Electric will accept no responsibility for actual
use of the product based on these illustrative examples.
HEAD OFFICE:MITSUBISHI DENKI BLDG MARUNOUCHI TOKYO 100 TELEX:J24532 CABLE MELCO TOKYO
HIMEJI WORKS:840, CHIYODA CHO, HIMEJI, JAPAN
Manual number : JY992D65201
Manual revision : A
Date : JUNE 1997
JY992D65201A
Effective JUN. 1997
Specifications are subject to
change without notice
Gain determines the angle or slope of the calibration line,
identified at a digital value of 1000.
(a) Small gain Large steps in digital readings
(b) Zero gain default : 5V or 20mA
(c) Large gain Small steps in digital readings
Offset is the ‘Position’ of the calibrated line, identified at a
digital value of 0.
(d) Negative offset
(e) Zero offset default : 0V or 4mA
(f) Positive offset
+1,000
Analog
Digital
Gain value
(a) (b)
(c)
Gain
Analog
Digital
Offset value
(d) (e) (f)
Offset
0
M8002
initial
pulse
TO K0 K30 D4 K1
CMP K2010 D4 M0
TO K0 K0 H3300 K1
P
M1
TO K0 K1 K4 K2
P
FROM K0 K29 K4M10 K1
M10 M20 FROM K0 K5 D0 K2
NO
error Digital output
value is normal
X010 SET M0
TO K0 K0 H0000 K1
P
TO K0 K21 K1 K1
P
TO K0 K22 K0 K1
M0
TO
TO K0 K23 K0 K1
P
TO K0 K24 K2500 K1
P
TO K0 K22 H0003 K1
TO
T1
TO K0 K21 K2 K1
P
T1 RST M0
P
K4
K4
P
DEFINING GAIN AND OFFSET
4
EXAMPLE PROGRAM
5DIAGNOSTICS 6
www.datasheet4u.com

(4) Status Information BFM #29
Bit devices of BFM #29 ON OFF
b0 : Error When any of b1 to b4 is ON. If any of b2 to b4 is ON, A/D conversion of
all the channels is stopped No error
b1 : Offset / gain error Offset/Gain data in EEPROM is corrupted
or adjustment error. Offset/Gain data normal
b2 : Power source abnormality 24V DC power supply failure Power supply normal
b3 : Hardware error A/D converter or other hardware failure Hardware Normal
b10 : Digital range error Digital output value is less than -2048 or
more than +2047 Digital output value is normal.
b11: Averaging error Number of averaging samples is 4097 or
more or 0 or less (default of 8 will be used) Averaging is normal. (between 1 and 4096)
b12: Offset / gain adjust prohibit Prohibit-(b1, b0) of BFM #21 is set to (1, 0) Permit-(b1, b0) of BFM #21 is set to (0,1)
NOTE: b4 to b7, b9 and b13 to b15 are undefined.
(5) Identification Code BFM #30
The identification (or ID) code number for a Special Function Block is read using the FROM command.
This number for the FX2N-4AD unit is K2010.
The user’s program in the PC can use this facility in the program to identify the special function block before
commencing data transfer from and to the special function block.
CAUTION
•Values of BFM #0, #23 and #24 are copied to EEPROM memory of the FX2N-4AD. BFM #21 and BFM #22
are only copied when data is written to the gain/offset command buffer BFM #22. Also, BFM #20 causes
writing to the EEPROM memory. The EEPROM has a life of about 10,000 cycles (changes), so do not
use programs which frequently change these BFMs.
•Because of the time needed to write to the EEPROM memory, a delay of 300 ms is required between
instructions that cause a write to the EEPROM.
Therefore, a delay timer should be used before writing to the EEPROM a second time.
Offset and gain can be set independently or together. Reasonable offset ranges are -5 to +5V or -20mA to 20mA, and
gain values 1V to 15V or 4mA to 32mA. Gain and offset can be adjusted by software in the FX2N main unit (see
program example 2)
•Bit device’s b1, b2 of the gain/offset BFM #21 should be set to 0, 1 to allow adjustment.
•Once adjustment is complete these bit devices should be set to 1, 0 to prohibit any further changes.
•Channel initialization (BFM #0) should be set to the nearest range, i. e. voltage/current etc.
5.1 Basic Program
In the following example channels CH1 and CH2 are used as voltage inputs. The FX2N-4AD block is connected at the
position of special function block No.0. Averaging is set at 4 and data registers D0 and D1 of the PC receive the
averaged digital data.
The ID code for the special function block at position “0" is read
from BFM #30 of that block and stored at D4 in the main unit.
This is compared to check the block is a FX2N-4AD, if OK M1 is
turned ON. These two program steps are not strictly needed to
perform an analog read. They are however a useful check and
are recommended as good practice.
The analog input channels (CH1, CH2) are setup by writing
H3300 to BFM #0 of the FX2N-4AD.
The number of averaged samples for CH1 and CH2 is set to 4 by
writing 4 to BFM #1 and #2 respectively.
The operational status of the FX2N-4AD is read from BFM #29
and output as bit devices at the FX2N main unit.
If there are no errors in the operation of the FX2N-4AD, then the
averaged data BFM’s are read.
In the case of this example BFM #5 and #6 are read into the FX2N
main unit and stored at D0 and D1. These devices contain the
averaged data for CH1 and CH2 respectively.
5.2 Using gain and offset in a program
The gain and offset of the FX2N-4AD can be adjusted using push-button switches on the input terminal of the PC. It can
also be adjusted using software settings sent from the PC.
Only the gain and offset values in the memory of the FX2N-4AD need be adjusted. A voltmeter or an ammeter for the
analog input is not needed. A program for the PC will be needed however.
The following is an example of changing the offset value on input channel CH1 to 0V and the gain value to 2.5V.
The FX2N-4AD block is in the position of block No.0 (i.e. closest to the FX2N main unit).
Example: Adjusting gain/offset via software settings
Adjustment start.
(H0000) →BFM #0 (initialize input channels)
Enter the instructions on the left and RUN the PC.
(K1) →BFM #21
BFM #21 (gain/offset adjust prohibit) must be set to permit with
(b1, b0) = (0,1).
(K0) →BFM #22 (offset/gain adjust)
Reset adjust bits.
(K0) →BFM #23 (offset)
(K2500) →BFM #24 (gain)
(H0003) →BFM #22 (offset/gain adjust)
3 = 0011 i.e. O1 = 1, G1 = 1.
Therefore channel 1 is adjusted.
Adjustment end.
(K2) →BFM #21
BFM #21 gain/offset adjust prohibit.
6.1 _Preliminary checks
I. Check whether the input wiring and/or extension cables are properly connected on FX2N-4AD analog special function
block
II. Check that the FX2N system configuration rules have not been broken, i.e. the number of special function blocks
does not exceed 8 and the total system I/O is equal or less than 256 I/O.
III. Ensure that the correct operating range has been selected for the application.
IV. Check that there is no power overload on either the 5V or 24V power sources, remember the loading on a FX2N
main unit or a powered extension unit varies according to the number of extension blocks or special function
blocks connected.
V. Put the FX2N main unit into RUN.
6.2 Error checking
If the FX2N-4AD special function block does not seem to operate normally, check the following items.
•Check the status of the POWER LED.
Lit : The extension cable is properly connected.
Otherwise : Check the connection of the extension cable.
•Check the external wiring.
•Check the status fo the “24V” LED (top right corner of the FX2N-4AD).
Lit : FX2N-4AD is OK, 24V DC power source is OK.
Otherwise : Possible 24VDC power failure, if OK possible FX2N-4AD failure.
•Check the status fo the “A/D” LED (top right corner of the FX2N-4AD).
Lit : A/D conversion is proceeding normally.
Otherwise : Check buffer memory #29 (error status). If any bits (b2 and b3) are ON, then this is why
the A/D LED is OFF.
Guidelines for the safety of the user and protection of the FX2N-4AD special function block
•This manual has been written to be used by trained and competent personnel. This is defined by
the European directives for machinery, low voltage and EMC.
•If in doubt at any stage during the installation of the FX2N-24AD always consult a professional
electrical engineer who is qualified and trained to the local and national standards. If in doubt
about the operation or use of the FX2N-4AD please consult the nearest Mitsubishi Electric
distributor.
•Under no circumstances will Mitsubishi Electric be liable or responsible for any consequential
damage that may arise as a result of the installation or use of this equipment.
•All examples and diagrams shown in this manual are intended only as an aid to understanding
the text, not to guarantee operation. Mitsubishi Electric will accept no responsibility for actual
use of the product based on these illustrative examples.
HEAD OFFICE:MITSUBISHI DENKI BLDG MARUNOUCHI TOKYO 100 TELEX:J24532 CABLE MELCO TOKYO
HIMEJI WORKS:840, CHIYODA CHO, HIMEJI, JAPAN
Manual number : JY992D65201
Manual revision : A
Date : JUNE 1997
JY992D65201A
Effective JUN. 1997
Specifications are subject to
change without notice
Gain determines the angle or slope of the calibration line,
identified at a digital value of 1000.
(a) Small gain Large steps in digital readings
(b) Zero gain default : 5V or 20mA
(c) Large gain Small steps in digital readings
Offset is the ‘Position’ of the calibrated line, identified at a
digital value of 0.
(d) Negative offset
(e) Zero offset default : 0V or 4mA
(f) Positive offset
+1,000
Analog
Digital
Gain value
(a) (b)
(c)
Gain
Analog
Digital
Offset value
(d) (e) (f)
Offset
0
M8002
initial
pulse
TO K0 K30 D4 K1
CMP K2010 D4 M0
TO K0 K0 H3300 K1
P
M1
TO K0 K1 K4 K2
P
FROM K0 K29 K4M10 K1
M10 M20 FROM K0 K5 D0 K2
NO
error Digital output
value is normal
X010 SET M0
TO K0 K0 H0000 K1
P
TO K0 K21 K1 K1
P
TO K0 K22 K0 K1
M0
TO
TO K0 K23 K0 K1
P
TO K0 K24 K2500 K1
P
TO K0 K22 H0003 K1
TO
T1
TO K0 K21 K2 K1
P
T1 RST M0
P
K4
K4
P
DEFINING GAIN AND OFFSET
4
EXAMPLE PROGRAM
5DIAGNOSTICS 6
www.datasheet4u.com

(4) Status Information BFM #29
Bit devices of BFM #29 ON OFF
b0 : Error When any of b1 to b4 is ON. If any of b2 to b4 is ON, A/D conversion of
all the channels is stopped No error
b1 : Offset / gain error Offset/Gain data in EEPROM is corrupted
or adjustment error. Offset/Gain data normal
b2 : Power source abnormality 24V DC power supply failure Power supply normal
b3 : Hardware error A/D converter or other hardware failure Hardware Normal
b10 : Digital range error Digital output value is less than -2048 or
more than +2047 Digital output value is normal.
b11: Averaging error Number of averaging samples is 4097 or
more or 0 or less (default of 8 will be used) Averaging is normal. (between 1 and 4096)
b12: Offset / gain adjust prohibit Prohibit-(b1, b0) of BFM #21 is set to (1, 0) Permit-(b1, b0) of BFM #21 is set to (0,1)
NOTE: b4 to b7, b9 and b13 to b15 are undefined.
(5) Identification Code BFM #30
The identification (or ID) code number for a Special Function Block is read using the FROM command.
This number for the FX2N-4AD unit is K2010.
The user’s program in the PC can use this facility in the program to identify the special function block before
commencing data transfer from and to the special function block.
CAUTION
•Values of BFM #0, #23 and #24 are copied to EEPROM memory of the FX2N-4AD. BFM #21 and BFM #22
are only copied when data is written to the gain/offset command buffer BFM #22. Also, BFM #20 causes
writing to the EEPROM memory. The EEPROM has a life of about 10,000 cycles (changes), so do not
use programs which frequently change these BFMs.
•Because of the time needed to write to the EEPROM memory, a delay of 300 ms is required between
instructions that cause a write to the EEPROM.
Therefore, a delay timer should be used before writing to the EEPROM a second time.
Offset and gain can be set independently or together. Reasonable offset ranges are -5 to +5V or -20mA to 20mA, and
gain values 1V to 15V or 4mA to 32mA. Gain and offset can be adjusted by software in the FX2N main unit (see
program example 2)
•Bit device’s b1, b2 of the gain/offset BFM #21 should be set to 0, 1 to allow adjustment.
•Once adjustment is complete these bit devices should be set to 1, 0 to prohibit any further changes.
•Channel initialization (BFM #0) should be set to the nearest range, i. e. voltage/current etc.
5.1 Basic Program
In the following example channels CH1 and CH2 are used as voltage inputs. The FX2N-4AD block is connected at the
position of special function block No.0. Averaging is set at 4 and data registers D0 and D1 of the PC receive the
averaged digital data.
The ID code for the special function block at position “0" is read
from BFM #30 of that block and stored at D4 in the main unit.
This is compared to check the block is a FX2N-4AD, if OK M1 is
turned ON. These two program steps are not strictly needed to
perform an analog read. They are however a useful check and
are recommended as good practice.
The analog input channels (CH1, CH2) are setup by writing
H3300 to BFM #0 of the FX2N-4AD.
The number of averaged samples for CH1 and CH2 is set to 4 by
writing 4 to BFM #1 and #2 respectively.
The operational status of the FX2N-4AD is read from BFM #29
and output as bit devices at the FX2N main unit.
If there are no errors in the operation of the FX2N-4AD, then the
averaged data BFM’s are read.
In the case of this example BFM #5 and #6 are read into the FX2N
main unit and stored at D0 and D1. These devices contain the
averaged data for CH1 and CH2 respectively.
5.2 Using gain and offset in a program
The gain and offset of the FX2N-4AD can be adjusted using push-button switches on the input terminal of the PC. It can
also be adjusted using software settings sent from the PC.
Only the gain and offset values in the memory of the FX2N-4AD need be adjusted. A voltmeter or an ammeter for the
analog input is not needed. A program for the PC will be needed however.
The following is an example of changing the offset value on input channel CH1 to 0V and the gain value to 2.5V.
The FX2N-4AD block is in the position of block No.0 (i.e. closest to the FX2N main unit).
Example: Adjusting gain/offset via software settings
Adjustment start.
(H0000) →BFM #0 (initialize input channels)
Enter the instructions on the left and RUN the PC.
(K1) →BFM #21
BFM #21 (gain/offset adjust prohibit) must be set to permit with
(b1, b0) = (0,1).
(K0) →BFM #22 (offset/gain adjust)
Reset adjust bits.
(K0) →BFM #23 (offset)
(K2500) →BFM #24 (gain)
(H0003) →BFM #22 (offset/gain adjust)
3 = 0011 i.e. O1 = 1, G1 = 1.
Therefore channel 1 is adjusted.
Adjustment end.
(K2) →BFM #21
BFM #21 gain/offset adjust prohibit.
6.1 _Preliminary checks
I. Check whether the input wiring and/or extension cables are properly connected on FX2N-4AD analog special function
block
II. Check that the FX2N system configuration rules have not been broken, i.e. the number of special function blocks
does not exceed 8 and the total system I/O is equal or less than 256 I/O.
III. Ensure that the correct operating range has been selected for the application.
IV. Check that there is no power overload on either the 5V or 24V power sources, remember the loading on a FX2N
main unit or a powered extension unit varies according to the number of extension blocks or special function
blocks connected.
V. Put the FX2N main unit into RUN.
6.2 Error checking
If the FX2N-4AD special function block does not seem to operate normally, check the following items.
•Check the status of the POWER LED.
Lit : The extension cable is properly connected.
Otherwise : Check the connection of the extension cable.
•Check the external wiring.
•Check the status fo the “24V” LED (top right corner of the FX2N-4AD).
Lit : FX2N-4AD is OK, 24V DC power source is OK.
Otherwise : Possible 24VDC power failure, if OK possible FX2N-4AD failure.
•Check the status fo the “A/D” LED (top right corner of the FX2N-4AD).
Lit : A/D conversion is proceeding normally.
Otherwise : Check buffer memory #29 (error status). If any bits (b2 and b3) are ON, then this is why
the A/D LED is OFF.
Guidelines for the safety of the user and protection of the FX2N-4AD special function block
•This manual has been written to be used by trained and competent personnel. This is defined by
the European directives for machinery, low voltage and EMC.
•If in doubt at any stage during the installation of the FX2N-24AD always consult a professional
electrical engineer who is qualified and trained to the local and national standards. If in doubt
about the operation or use of the FX2N-4AD please consult the nearest Mitsubishi Electric
distributor.
•Under no circumstances will Mitsubishi Electric be liable or responsible for any consequential
damage that may arise as a result of the installation or use of this equipment.
•All examples and diagrams shown in this manual are intended only as an aid to understanding
the text, not to guarantee operation. Mitsubishi Electric will accept no responsibility for actual
use of the product based on these illustrative examples.
HEAD OFFICE:MITSUBISHI DENKI BLDG MARUNOUCHI TOKYO 100 TELEX:J24532 CABLE MELCO TOKYO
HIMEJI WORKS:840, CHIYODA CHO, HIMEJI, JAPAN
Manual number : JY992D65201
Manual revision : A
Date : JUNE 1997
JY992D65201A
Effective JUN. 1997
Specifications are subject to
change without notice
Gain determines the angle or slope of the calibration line,
identified at a digital value of 1000.
(a) Small gain Large steps in digital readings
(b) Zero gain default : 5V or 20mA
(c) Large gain Small steps in digital readings
Offset is the ‘Position’ of the calibrated line, identified at a
digital value of 0.
(d) Negative offset
(e) Zero offset default : 0V or 4mA
(f) Positive offset
+1,000
Analog
Digital
Gain value
(a) (b)
(c)
Gain
Analog
Digital
Offset value
(d) (e) (f)
Offset
0
M8002
initial
pulse
TO K0 K30 D4 K1
CMP K2010 D4 M0
TO K0 K0 H3300 K1
P
M1
TO K0 K1 K4 K2
P
FROM K0 K29 K4M10 K1
M10 M20 FROM K0 K5 D0 K2
NO
error Digital output
value is normal
X010 SET M0
TO K0 K0 H0000 K1
P
TO K0 K21 K1 K1
P
TO K0 K22 K0 K1
M0
TO
TO K0 K23 K0 K1
P
TO K0 K24 K2500 K1
P
TO K0 K22 H0003 K1
TO
T1
TO K0 K21 K2 K1
P
T1 RST M0
P
K4
K4
P
DEFINING GAIN AND OFFSET
4
EXAMPLE PROGRAM
5DIAGNOSTICS 6
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This manual contains text, diagrams and explanations which will guide the reader in the correct installation and
operation of the FX2N-4AD and should be read and understood before attempting to install or use the unit.
Further information can be found in the FX SERIES PROGRAMMING MANUAL, FX2N SERIES HARDWARE MANUAL .
•The FX2N-4AD analog special function block has four input channels. The input channels receive analog signals
and convert them into a digital value. This is called an A/D conversion. The FX2N-4AD has maximum resolution of
12 bits.
•The selection of voltage or current based input/output is by user wiring. Analog ranges of -10 to 10V DC (resolution:
5mV), and/or 4 to 20mA, -20 to 20mA(resolution: 20µA) may be selected.
•Data transfer between the FX2N-4AD and the FX2N main unit is by buffer memory exchange. There are 32 buffer
memories (each of 16 bits) in the FX2N-4AD.
•The FX2N-4AD occupies 8 points of I/O on the FX2N expansion bus. The 8 points can be allocated from either inputs
or outputs. The FX2N-4AD draws 30mA from the 5V rail of the FX2N main unit or powered extension unit.
1.1 EXTERNAL DIMENSIONS
Weight : Approx. 0.3 kg (0.66 lbs) Dimensions : mm (inches)
➀The analog input is received through a twisted pair
shielded cable. This cable should be wired separately
from power lines or any other lines which may induce
electrical noise.
➁If a voltage ripple occurs during input, or there is
electrically induced noise on the external wiring, connect a
smoothing capacitor of 0.1 to 0.47µF, 25V.
➂If you are using current input, connect the V+ and I+
terminals to each other.
➃If there is excessive electrical noise, connect the FG frame
ground terminal with the grounded terminal on the
FX2N-4AD.
➄Connect the ground terminal on the FX2N-4AD unit with the
grounded terminal on the main unit. Use class 3
grounding on the main unit, if available.
POWER
A/D
24V
55(2.17)
90(3.54)
4
87(3.43)
FX2N-4AD
55(2.17)
80(3.15)
I+
VI-
V+
I+
VI-
CH4
CH3
CH2
CH1
V+
I+V+
I+
V+
24+
24-
VI- VI- FG
FG
FG
9(0.35) 4
Mounting holes
4.5mm(0.18)dia.
DIN rail
Mounting slot
35mm(1.38)
Extension cable
and connector A/D LED 24V LED
Terminal screws M3(0.12)
CH1
V+
24+
24-
VI-
3.1 Environment specification
Item Specification
Environmental specifications (excluding following) Same as those for the FX2N main unit
Dielectric withstand voltage 500VAC, 1min (between all terminals and ground)
3.2 Power supply specification
Item Specification
Analog circuits 24V DC ±10%, 55mA
(external power supply from main unit)
Digital circuits 5V DC, 30mA (internal powersupply from main unit)
PC
V+
FG
I+
VI-
Voltage input
-10V to +10V
V+
FG
I+
VI-
Current input
-20mA to +20mA
24-
24+
100KW
100KW
250W
250W
100KW
100KW CH4
CH1
+15V
AG
-15V
AG
CH4
CH1
1
Shielded
2
3
4
5
1
Shielded
Class 3
Grounding
(100Wor less) Extension cable
FX2N-4AD
Analog Input Block
DC24V 55mA DC/DC
converter
3.3 Performance specification
Analog Inputs
Item Voltage input Current input
Either voltage or current input can be selected with your choice of input terminal. Up to four
input points can be used at one time.
Analog input range DC -10V to +10V (input resistance: 200kΩ). Warning: this unit may be damaged by input
voltage in excess of ±15V.
DC -20mA to +20mA (input resistance:
250Ω). Warning: this unit may be damaged
by input currents in excess of ±32mA.
Digital output 12-bit conversion stored in 16-bit 2’s complement form.
Maximum value: +2047 Minimum value: -2048
Resolution 5mV (10V default range 1/2000) 20µA (20mA default range 1/1000)
Over all accuracy ±1% (for the range of -10V to +10V) ±1% (for the range of -20mA to +20mA)
Conversion speed 15ms/channel (Normal speed), 6ms/channel (High speed)
Analog Inputs continued...
Preset 0 (-10V to +10V) Preset 1 (+4mA to +20mA) Preset 2 (-20mA to +20mA)
NOTE: Preset ranges are selected by an appropriate setting in buffer memory of the analog block.
Current/Voltage input selection must match the correct input terminal connections.
Miscellaneous
Item Specification
Isolation Photo-coupler isolation between analog and digital circuits.
DC/DC converter isolation of power from FX2N MPU.
No isolation between analog channels.
Number of occupied I/O points 8 points taken from the FX2N expansion bus
(can be either inputs or outputs)
3.4 Allocation of buffer memories (BFM)
In buffer memory locations (BFMs)
marked with an “*” data can be written
from the PC using the TO command.
For buffer memories (BFMs) without “*”
mark, data can be read to the PC using
the FROM command.
Before reading from the analog special
function block, ensure these settings
have been sent to the analog special
function block. Otherwise, the previous
values held in the analog block will be
used.
The buffer memory also gives a facility
to adjust offset and gain by software.
Offset (intercept): The analog input
value when the digital output becomes 0.
Gain (slope): The analog input value
when the digital output becomes +1000.
(1) Channel Selection
Channel initialization is made by a 4 character HEX number HOOOO inbuffer memory BFM #0.
The least significant character controls channel 1 and the 4 character controls channel 4.
Setting of each character is as follows:
O = 0: Preset range (-10V to +10V) O = 2: Preset range (-20mA to +20mA)
O = 1: Preset range (+4mA to +20mA) O = 3: Channel OFF
Example: H3310
CH1: Preset range (-10V to +10V)
CH2: Preset range (+4mA to +20mA)
CH3, CH4: Channel OFF
(2) Analog to Digital Conversion Speed Change
By writing 0 or 1 into BFM #15 of the FX2N-4AD, the speed at which A/D conversion is performed can be changed.
However the following points should be noted:
To maintain a high speed conversion rate, use the FROM/TO commands as seldom as possible.
NOTES: When a conversion speed change is made, BFM #1-#4 are set to their default values immediately after the
change. This is regardless of the values they held originally. Bear this in mind if a speed change will be
made as part of the normal program execution.
(3) Adjusting Gain and Offset values
(a) When buffer memory BFM #20 is activated by setting it to K1, all settings within the analog special function
block are reset to their default settings. This is a very quick method to erase any undesired gain and offset
adjustments.
(b) If (b1, b0) of BFM #21 is set to (1,0), gain and offset adjustments are prohibited to prevent inadvertent changes
by the operator. In order to adjust the gain and offset values, bits (b1, b0) must be set to (0,1). The default is
(0,1).
(c) Gain and offset values of BFM #23 and #24 are sent to non-volatile memory gain and offset registers of the
specified input channels. Input channels to be adjusted are specified by the appropriate G-O (gain-offset) bits
of BFM #22
Example: If bits G1 and O1 are set to 1, input channel 1 will be adjusted when BFM #22 is written to by a TO
instruction.
(d) Channels can be adjusted individually or together with the same gain and offset values.
(e) Gain and offset values in BFM #23 #24 are in units of mV or µA. Due to the resolution of the unit the actual
response will be in steps of 5mV or 20µA.
FX2N-4AD SPECIAL FUNCTION BLOCK
USER’S GUIDE
JY992D65201A
TERMINAL LAYOUTS
2
BFM Contents
*#0 Channel initialization Default = H0000
*#1 Channel 1 Contains the number of samples (1 to
4096) to be used for an averaged result.
The default setting is 8-normal speed. High
speed operation can be selected with a
value of 1.
*#2 Channel 2
*#3 Channel 3
*#4 Channel 4
#5 Channel 1 These buffer memories contain the
averaged input values for the number of
samples entered for the channel in buffer
memories #1 to #4 respectively.
#6 Channel 2
#7 Channel 3
#8 Channel 4
#9 Channel 1 These buffer memories contain the present
value currently being read by each input
channel.
#10 Channel 2
#11 Channel 3
#12 Channel 4
#13-#14 Reserved
#15 Selection of A/D conversion
speed see note 2
When set to 0, a normal speed is selected
of 15ms/ch (default)
When set to 1, a high speed is selected of
6ms/ch
BFM b7 b6 b5 b4 b3 b2 b1 b0
#16-#19 Reserved
*#20 Reset to Defaults and Preset. Default = 0
*#21 Offset, Gain Adjust Prohibit. Default = (0, 1) Permit
*#22 Offset, Gain Adjust G4 O4 G3 O3 G2 O2 G1 O1
*#23 Offset Value Default = 0
*#24 Gain Value Default = 5,000
#25-#28 Reserved
#29 Error status
#30 Identification code K2010
#31 Cannot be used
Voltage input
Digital output
-2,000
-2,048
-10.240V
+2,000 +2,047
+10.235V
+10V
-10V
+1,750
+1,000
Current input
Digital
output
+32mA
+20mA+4mA0 Current input
Digital
output
-1,000
-1,600
-32mA
+1,000
+1,600
+32mA
+20mA
-20mA
INTRODUCTION
1
INSTALLATION NOTES AND USAGE
3
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(4) Status Information BFM #29
Bit devices of BFM #29 ON OFF
b0 : Error When any of b1 to b4 is ON. If any of b2 to b4 is ON, A/D conversion of
all the channels is stopped No error
b1 : Offset / gain error Offset/Gain data in EEPROM is corrupted
or adjustment error. Offset/Gain data normal
b2 : Power source abnormality 24V DC power supply failure Power supply normal
b3 : Hardware error A/D converter or other hardware failure Hardware Normal
b10 : Digital range error Digital output value is less than -2048 or
more than +2047 Digital output value is normal.
b11: Averaging error Number of averaging samples is 4097 or
more or 0 or less (default of 8 will be used) Averaging is normal. (between 1 and 4096)
b12: Offset / gain adjust prohibit Prohibit-(b1, b0) of BFM #21 is set to (1, 0) Permit-(b1, b0) of BFM #21 is set to (0,1)
NOTE: b4 to b7, b9 and b13 to b15 are undefined.
(5) Identification Code BFM #30
The identification (or ID) code number for a Special Function Block is read using the FROM command.
This number for the FX2N-4AD unit is K2010.
The user’s program in the PC can use this facility in the program to identify the special function block before
commencing data transfer from and to the special function block.
CAUTION
•Values of BFM #0, #23 and #24 are copied to EEPROM memory of the FX2N-4AD. BFM #21 and BFM #22
are only copied when data is written to the gain/offset command buffer BFM #22. Also, BFM #20 causes
writing to the EEPROM memory. The EEPROM has a life of about 10,000 cycles (changes), so do not
use programs which frequently change these BFMs.
•Because of the time needed to write to the EEPROM memory, a delay of 300 ms is required between
instructions that cause a write to the EEPROM.
Therefore, a delay timer should be used before writing to the EEPROM a second time.
Offset and gain can be set independently or together. Reasonable offset ranges are -5 to +5V or -20mA to 20mA, and
gain values 1V to 15V or 4mA to 32mA. Gain and offset can be adjusted by software in the FX2N main unit (see
program example 2)
•Bit device’s b1, b2 of the gain/offset BFM #21 should be set to 0, 1 to allow adjustment.
•Once adjustment is complete these bit devices should be set to 1, 0 to prohibit any further changes.
•Channel initialization (BFM #0) should be set to the nearest range, i. e. voltage/current etc.
5.1 Basic Program
In the following example channels CH1 and CH2 are used as voltage inputs. The FX2N-4AD block is connected at the
position of special function block No.0. Averaging is set at 4 and data registers D0 and D1 of the PC receive the
averaged digital data.
The ID code for the special function block at position “0" is read
from BFM #30 of that block and stored at D4 in the main unit.
This is compared to check the block is a FX2N-4AD, if OK M1 is
turned ON. These two program steps are not strictly needed to
perform an analog read. They are however a useful check and
are recommended as good practice.
The analog input channels (CH1, CH2) are setup by writing
H3300 to BFM #0 of the FX2N-4AD.
The number of averaged samples for CH1 and CH2 is set to 4 by
writing 4 to BFM #1 and #2 respectively.
The operational status of the FX2N-4AD is read from BFM #29
and output as bit devices at the FX2N main unit.
If there are no errors in the operation of the FX2N-4AD, then the
averaged data BFM’s are read.
In the case of this example BFM #5 and #6 are read into the FX2N
main unit and stored at D0 and D1. These devices contain the
averaged data for CH1 and CH2 respectively.
5.2 Using gain and offset in a program
The gain and offset of the FX2N-4AD can be adjusted using push-button switches on the input terminal of the PC. It can
also be adjusted using software settings sent from the PC.
Only the gain and offset values in the memory of the FX2N-4AD need be adjusted. A voltmeter or an ammeter for the
analog input is not needed. A program for the PC will be needed however.
The following is an example of changing the offset value on input channel CH1 to 0V and the gain value to 2.5V.
The FX2N-4AD block is in the position of block No.0 (i.e. closest to the FX2N main unit).
Example: Adjusting gain/offset via software settings
Adjustment start.
(H0000) →BFM #0 (initialize input channels)
Enter the instructions on the left and RUN the PC.
(K1) →BFM #21
BFM #21 (gain/offset adjust prohibit) must be set to permit with
(b1, b0) = (0,1).
(K0) →BFM #22 (offset/gain adjust)
Reset adjust bits.
(K0) →BFM #23 (offset)
(K2500) →BFM #24 (gain)
(H0003) →BFM #22 (offset/gain adjust)
3 = 0011 i.e. O1 = 1, G1 = 1.
Therefore channel 1 is adjusted.
Adjustment end.
(K2) →BFM #21
BFM #21 gain/offset adjust prohibit.
6.1 _Preliminary checks
I. Check whether the input wiring and/or extension cables are properly connected on FX2N-4AD analog special function
block
II. Check that the FX2N system configuration rules have not been broken, i.e. the number of special function blocks
does not exceed 8 and the total system I/O is equal or less than 256 I/O.
III. Ensure that the correct operating range has been selected for the application.
IV. Check that there is no power overload on either the 5V or 24V power sources, remember the loading on a FX2N
main unit or a powered extension unit varies according to the number of extension blocks or special function
blocks connected.
V. Put the FX2N main unit into RUN.
6.2 Error checking
If the FX2N-4AD special function block does not seem to operate normally, check the following items.
•Check the status of the POWER LED.
Lit : The extension cable is properly connected.
Otherwise : Check the connection of the extension cable.
•Check the external wiring.
•Check the status fo the “24V” LED (top right corner of the FX2N-4AD).
Lit : FX2N-4AD is OK, 24V DC power source is OK.
Otherwise : Possible 24VDC power failure, if OK possible FX2N-4AD failure.
•Check the status fo the “A/D” LED (top right corner of the FX2N-4AD).
Lit : A/D conversion is proceeding normally.
Otherwise : Check buffer memory #29 (error status). If any bits (b2 and b3) are ON, then this is why
the A/D LED is OFF.
Guidelines for the safety of the user and protection of the FX2N-4AD special function block
•This manual has been written to be used by trained and competent personnel. This is defined by
the European directives for machinery, low voltage and EMC.
•If in doubt at any stage during the installation of the FX2N-24AD always consult a professional
electrical engineer who is qualified and trained to the local and national standards. If in doubt
about the operation or use of the FX2N-4AD please consult the nearest Mitsubishi Electric
distributor.
•Under no circumstances will Mitsubishi Electric be liable or responsible for any consequential
damage that may arise as a result of the installation or use of this equipment.
•All examples and diagrams shown in this manual are intended only as an aid to understanding
the text, not to guarantee operation. Mitsubishi Electric will accept no responsibility for actual
use of the product based on these illustrative examples.
HEAD OFFICE:MITSUBISHI DENKI BLDG MARUNOUCHI TOKYO 100 TELEX:J24532 CABLE MELCO TOKYO
HIMEJI WORKS:840, CHIYODA CHO, HIMEJI, JAPAN
Manual number : JY992D65201
Manual revision : A
Date : JUNE 1997
JY992D65201A
Effective JUN. 1997
Specifications are subject to
change without notice
Gain determines the angle or slope of the calibration line,
identified at a digital value of 1000.
(a) Small gain Large steps in digital readings
(b) Zero gain default : 5V or 20mA
(c) Large gain Small steps in digital readings
Offset is the ‘Position’ of the calibrated line, identified at a
digital value of 0.
(d) Negative offset
(e) Zero offset default : 0V or 4mA
(f) Positive offset
+1,000
Analog
Digital
Gain value
(a) (b)
(c)
Gain
Analog
Digital
Offset value
(d) (e) (f)
Offset
0
M8002
initial
pulse
TO K0 K30 D4 K1
CMP K2010 D4 M0
TO K0 K0 H3300 K1
P
M1
TO K0 K1 K4 K2
P
FROM K0 K29 K4M10 K1
M10 M20 FROM K0 K5 D0 K2
NO
error Digital output
value is normal
X010 SET M0
TO K0 K0 H0000 K1
P
TO K0 K21 K1 K1
P
TO K0 K22 K0 K1
M0
TO
TO K0 K23 K0 K1
P
TO K0 K24 K2500 K1
P
TO K0 K22 H0003 K1
TO
T1
TO K0 K21 K2 K1
P
T1 RST M0
P
K4
K4
P
DEFINING GAIN AND OFFSET
4
EXAMPLE PROGRAM
5DIAGNOSTICS 6
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