Mitsubishi FX2N-4AD-PT User manual

FX2N-4AD-PT SPECIAL FUNCTION BLOCK
USER’S GUIDE
JY992D65601B
This manual contains text, diagrams and explanations which will guide the reader in the correct
installation and operation of the FX2N-4AD-PT special function block and should be read and understood
before attempting to install or use the unit.
Further information can be found in the FX PROGRAMMING MANUAL(ΙΙ) and FX0N/FX1N/FX2N/FX2NC
SERIES HARDWARE MANUAL.
Guidelines for the Safety of the User and Protection of the FX2N-4AD-PT
special function block.
This manual should be used by trained and competent personnel. The definition of such a person or
persons is as follows:
a) Any engineer using the product associated with this manual, should be of a competent nature,
trained and qualified to the local and national standards. These engineers should be fully aware of
all aspects of safety with regards to automated equipment.
b) Any commissioning or service engineer must be of a competent nature, trained and qualified to
the local and national standards.
c) All operators of the completed equipment should be trained to use this product in a safe and
coordinated manner in compliance to established safety practices.
Note: The term ‘completed equipment’ refers to a third party constructed device which contains or uses
the product associated with this manual.
Notes on the Symbols Used in this Manual
At various times throughout this manual certain symbols will be used to highlight points of information
which are intended to ensure the users personal safety and protect the integrity of equipment.
1) Indicates that the identified danger WILL cause physical and property damage.
2) Indicates that the identified danger could POSSIBLY cause physical and property
damage.
• 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 the actual use of
the product based on these illustrative examples.
• Owing to the very great variety in possible applications for this equipment, you must satisfy yourself as
to its suitability for your specific application.
1. INTRODUCTION
• The FX2N-4AD-PT analog block amplifies the input from four platinum temperature sensors (PT 100, 3
wire, 100 Ω) and converts the data into 12 bit reading’s stored in the main unit. Both Centigrade (°C)
and Fahrenheit (°F) can be read. Reading resolution is 0.2°C to 0.3°C / 0.36°F to 0.54°F.
• The FX2N-4AD-PT can connected to the FX0N, FX1N, FX2N and the FX2NC series Programmable
Controllers (PLC).
• All data transfers and parameter setups are adjusted via software control of the FX2N-4AD-PT; by use
of the TO/FROM applied instructions in the PLC.
• The FX2N-4AD-PT occupies 8 I/O points on the PLC expansion bus. The 8 I/O points can be allocated
from either inputs or outputs. The FX2N-4AD-PT draws 30mA from the 5V rail of the main unit or
powered extension unit.
2. EXTERNAL DIMENSIONS
3. CONNECTION WITH PLC
3.1 Connection with PLC
1) Up to 4 FX2N-4AD-PT units can connect to the FX0N series PLC, up to 5 for FX1N, up to 8 for FX2N or,
up to 4 for an FX2NC series PLC, all with powered extension units.
However the following limitation exists when the undermentioned special function blocks are
connected.
FX2N: Main unit and powered extension units of 32 I/O points or less. Current consumption
available for the undermentioned special function blocks ≤190mA
FX2N: Main unit and powered extension units of 48 I/O points or more. Current consumption
available for the undermentioned special function blocks ≤300mA
FX2NC: Up to 4 undermentioned special function blocks can be connected regardless of the system
I/O.
When using an FX2NC an FX2NC-CNV-IF is required.
FX0N/1N:Main unit and powered extension units. Up to 2 undermentioned special function blocks can
be connected regardless of the system I/O.
2) Each block occupies 8 I/O points (The 8 points can be allocated from either inputs or outputs).
3) FX2N-4AD-PT consumes 30mA from the 5V DC bus.
The total 5V consumption of all special function blocks connected to an FX2N or FX2NC main unit or
FX2N extension unit must not exceed the 5V source capacity of the system.
4) The FX2N-4AD-PT and main unit are connected by a cable on the right of the main unit.
3.2 Special function block numbers
Other special units of blocks that use FROM/TO instructions, such as analog input blocks, analog output
blocks and high-speed counter blocks, can be directly connected to the main unit of the PLC or to the right
side of other extension blocks or units.
4. WIRING
4.1 Wiring
cThe cable of the PT 100 sensor or a twisted shielded
cable should be used for the analog input cable. This
analog input cable should be wired separately from
power lines or any other lines which may induce noise.
The three wire method improves the accuracy of the
sensors by compensating voltage drops.
dIf there is electrical noise, connect the FG (frame
ground) terminal with the ground terminal. (In CH1, there
is no FG terminal. Use FG terminal of other channels.)
eConnect the ground terminal on the FX2N-4AD-PT unit
with the grounded terminal on the main unit. Use
grounding on the main unit, if grounding is possible.
P O W E R
2 4 V
A / D
CH4CH3
CH1
2 4 +
2 4 -
L +
L +
F X 2 N - 4 A D - P T
L - L -
L +
L -
I -
CH1
2 4 +
2 4 - L -
CH2
L -
L +
L +
4 ( 0 . 1 6 )
4 ( 0 . 1 6 )
5 5 ( 2 . 1 7 )
8 0 ( 3 . 1 5 )
0 ( 3 . 5 4 )
5 5 ( 2 . 1 7 )
8 7 ( 3 . 4 3 )
( 0 . 3 5 ) T e r m i n a l s c r e w s M 3 ( 0 . 1 2 )
2 4 V
L E D
A / D
L E D
D I N r a i l
m o u n t i n g s l o t
3 5 m m ( 1 . 3 8 )
M o u n t i n g h o l e s
4 . 5 m m ( 0 . 1 8 ) d i a .
E x t e n s i o n c a b l e
a n d c o n n e c t o r
F G
F G
I -
F G
I -
I -
I -
Weight: Approx. 0.3 kg (0.66 lbs) Dimensions: mm (inches)
F X - 1 6 E X
X000-X027
Y000-Y027
X 0 3 0
- X 0 4 7
2 N
F X - 4 8 M R - E S / U L 2 N
F X - 4 A D 2 N
N o . 2
2 N
F X - 4 A D - P T
X 0 5 0 - X 0 6 7
Y 0 3 0 - Y 0 4 7
2 N
F X - 3 2 E R
2 N
F X - 4 D A
P O W E R
A / D
2 4 V
F X - 4 A D
2 N
P O W E R
D / A
2 4 V
F X - 4 D A
2 N
N o . 1
N o . 0
P O W E R
24V
A / D
1
IN 0
7
2
3
4
5
6
P O W E R
1
IN 0
7
2
3
4
5
6
S p e c i a l b l o c k S p e c i a l b l o c k S p e c i a l b l o c k
X 0
X 5
72 4 5 61 30
1 61 1 1 51 4 1 71 0 1 2 1 3
1 4 171 51 0 1 2 1 3
72 4 5 61 30
1 61 1
O U T
IN
LX 1 1 X 1 3 X 1 5 X 1 7
X 6 X 1 0 X 1 2 X 1 4 X 1 6
2 4 +
N
C O M X 4
X 7
C O M 4
C O M 2
Y 4
Y 5
Y 6
Y 7 C O M 3
Y 1 0
Y 1 1
Y 1 2
Y 1 3
C O M 1
Y 0
Y 1
Y 2
Y 3
Y 1 4
Y 1 5
Y 1 6
Y 1 7
X 3
X 2
X 1
P O W E R
76 2 72 0 2 2 2 3 2 4 2 5 2 62 1
1 6 1 7
1 4 1 71 51 0 1 2 1 3
72 4 5 61 30 2 72 0 2 2 2 3 2 4 2 5 2 62 1
1 61 1
IN
L X 5 X 7 X 1 3 X 1 5 X 1 7 X 2 1 X 2 3 X 2 5
X 4 X 6 X 1 0 X1 4 X 1 6 X 2 0 X 2 2 X 2 4
2 4 +N
C O M X 0
X 1
X 2
C O M 4
Y 2 4
Y 2 5
C O M 5
Y 2 7C O M 2
Y 4
Y 5
Y 6
Y 7 C O M 3
Y 1 0
Y 1 3C O M 1
Y 0 Y 2
Y 3
Y 1 4
Y 1 5
Y 2 0
Y 2 1
Y 2 2
Y 2 3
Y 2 6
P O W E R
T . V
C P U . E
P R O G . E
F X
2 N
- 4 8 M R - E S / U L
F X
2 N
- 1 6 E X
PT100 1
shielded CH1
L+
L-
I-
FG
PT100 CH4
5V
4.7K4.7K
100K
100K
AG
L+
24+
24-
DC/DC
converter
AG
AG
5V
+15V
-15V
PLC
Extension cable
Grounding
(100
:
or less)
3
4
DC24V±10% 50mA 2
FX
2N
-4AD-PT
L-
I-
FG
1
shielded
fEither an external or the 24V built-in supply in the PLC
may be used.
For additional data regarding EMC considerations
please see section 10.
4.2 Using crimp terminations
• Use crimp terminals as indicated on the left.
• Secure the terminal using a tightening torque of between 5 and 8
kg⋅cm.
• Wire only to the module terminals discussed in this manual. Leave all
others vacant.
5. INSTALLATION NOTES AND USAGE
5.1 Environmental specification
5.2 Power supply specification
5.3 Performance specification
Analog Inputs
Analog Inputs continued...
Miscellaneous
Item Specification
Environmental specifications Same as those for the main unit
Dielectric withstand voltage 500V AC, 1min (between all terminals and ground)
Item Specification
Analog circuits 24V DC ± 10%, 50mA
Digital circuits 5V DC, 30mA (internal power supply from the main unit)
Item Centigrade Fahrenheit
Both °C and °F are available by reading the appropriate buffer memory (BFM).
Analog input signal Platinum Temperature PT 100 sensors (100 Ω), 3-wire, 4-channel (CH1, CH2,
CH3, CH4), 3850 PPM/°C (DIN 43760, JIS C1604-1989)
Current to sensor 1 mA. sensor: 100 ΩPT 100
Compensated range -100°C to +600°C -148°F to +1112°F
Digital output -1000 to 6000 -1480 to +11120
12-bit conversion 11 data bits +1 sign bit
Minimum resolvable
temp. 0.2°C to 0.3°C 0.36°F to 0.54°F
Overall accuracy ± 1% full scale (compensated range)
-see section 7.0 for special EMC considerations
Conversion speed 15 ms for 4 channels
Conversion
Characteristics
Item Specification
Isolation Photo-coupler isolation between analog and digital circuits. DC/DC converter isolation of power from the main unit.
No isolation between analog channels.
Number of occupied I/O points The block occupies 8 I/O points
(can be either inputs or outputs)
l e s s t h a n
6 . 2 m m ( 0 . 2 4 )
U s e M 3 ( 0 . 1 2
)
l e s s t h a n
6 . 2 m m ( 0 . 2 4 )
+6,000
-100°C
-1,000 +600°C
Temp. input°C
Digital
output
+11,120
-148°F
-1,480 +1,112°F
Temp. input°F
Digital
output
Industrial automation
Elincom Group
EuropeanUnion: www.elinco.eu
Russia: www.elinc.ru

HEAD OFFICE : MITSUBISHI DENKI BLDG MARUNOUTI TOKYO 100-8310 TELEX : J24532 CABLE MELCO TOKYO
HIMEJI WORKS : 840, CHIYODA CHO, HIMEJI, JAPAN
6. ALLOCATION OF BUFFER MEMORIES (BFM)
6.1 Buffer memories
The FX2N-4AD-PT communicates
with the PLC via buffer memories.
BFMs (buffer memories) #21 to #27
and #31 are reserved.
All BFM data can be read by the
PLC using the FROM instruction.
BFMs (buffer memories) marked
with an “*” can be written to from the
PLC using the TO instruction.
1) The number of samples to be averaged are assigned in BFMs #1 to #4. Only the range 1 to 4096 is
valid. Values outside this range are ignored. The default value of 8 is used.
2) A number of recently converted readings are averaged to give a smoother read out. The averaged
data is stored in BFMs #5 to #8 and #13 to #16.
3) BFMs #9 to #12 and #17 to #20 store the current value of the input data. This value is in units of 0.1°C
or 0.1°F, but the resolution is only 0.2°C to 0.3°C or 0.36°F to 0.54°F.
6.2 Status Information
1) Buffer Memory BFM #28: Digital range error latch
BFM #29 b10(digital range error) is used to judge whether the measured temperature is within the
unit’s range or not.
BFM #28 latches the error status of each channel and can be used to check for thermocouple
disconnection.
Low : Latches ON when the temperature measurement data drops below the lowest
temperature measurement limit.
High : Turns ON when the temperature measurement data rises above the highest
temperature measurement limit.
When an error occurs the temperature data before the error is latched. If the measured value returns
to within valid limits the temperature data returns to normal operation. (Note: The error remains
latched in (BFM #28))
An error can be cleared by writing K0 to BFM #28 using the TO instruction or turning off the power.
2) Buffer Memory BFM #29: Error status
3) Identification Code Buffer Memory BFM #30
The identification code or ID number for this Special Block is read from buffer memory BFM #30 using
the FROM instruction. This number for the FX2N-4AD-PT unit is K2040.
The PLC can use this facility in its program to identify the special block before commencing data
transfer from and to the special block.
b15 or b8 b7 b6 b5 b4 b3 b2 b1 b0
Not used High Low High Low High Low High Low
CH4 CH3 CH2 CH1
Bit devices of BFM #29 ON OFF
b0 : Error When either b1 or b3 is ON A/D conversion is stopped for
the error channel. No error
b1 : Reserved Reserved Reserved
b2 : Power source 24V DC power supply failure. Power supply normal
b3 : Hardware error A/D converter or other
hardware failure. Hardware Normal
b4 to b9 : Reserved Reserved Reserved
b10 : Digital range error Digital output/analog input value is outside the specified
range. Digital output value is normal.
b11 : Averaging error Selected number of averaged results is outside the available
range -see BFM #1 to #4
Averaging is normal.
(between 1 to 4096)
b12 to b15 : Reserved Reserved Reserved
BFM CONTENTS
*# 1 - #4 CH1 to CH4 Averaged temperature reading to be
averaged (1 to 256) Default = 8
#5 - #8 CH1 to CH4 Averaged temperature in 0.1°C units
#9 - #12 CH1 to CH4 Present temperature in 0.1°C units
#13 - #16 CH1 to CH4 Averaged temperature in 0.1°F units
#17 - #20 CH1 to CH4 Present temperature in 0.1°F units
#21 - #27 Reserved
*#28 Digital range error latch
#29 Error status
#30 Identification code K2030
#31 Reserved
7. SYSTEM BLOCK DIAGRAM
8. EXAMPLE PROGRAM
In the program shown below, the FX2N-4AD-PT block occupies the position of special block number 2 (that
is the third closest block to the PLC). The averaging amount is four. The averaged values in degrees C of
input channels CH1 to CH4 are stored respectively in data registers D0 to D3.
Multiplexer
CPU
System
ROM
Buffer
Memory
RAM
A/D
converter
PLC
Command
information
write and
data status
read
24V DC
Power Source
5V Power
Supply
POWER
LED
Photocoupler
±15V
CH1
CH2
CH3
CH4
A/D
LED
Cyclic switching
FX
2N
-4AD-PT Analog Block
DC/DC
converter
Gain and offset
values are
stored in the
EEPROM
Control
signals
Converted
data
5V 24V
LED
FROM
TO Analog Input
5V
M1
or
M8000
K2 K1 K4 K4
FNC79
TO
K2 K5 D0 K4
FNC78
FROM
K2 K9 D0 K4
FNC78
FROM
special
block No.2 FX
2N
-4AD-PT
BFM number result
destination No. of
words read
Block No.2 BFM #30 →(D10)
Identification code
This initial step checks that the special function block placed at position 2 is
actually an FX
2N
-4AD-PT, i.e. its unit identification number is 2040 (BFM #30).
This step is optional, but it provides a software check that the system has been
configured correctly.
This step provides optional monitoring of the FX
2N
-4AD-PT Error Buffer Memory
(#29). If there is an Error on the FX
2N
-4AD-PT, bit b0 of BFM #29 will be set on.
This can be read by this program step, and output as a bit device in the PLC (Y010 in
this example). Additional Error devices can be output in a similar manner, i.e. b10 BFM
#29. (see below)
M8002
Initiali-
zation
Pulse
K2 K30 D10 K1
FNC78
FROM
K2040 D10 M0
FNC10
CMP When (K2040) = (D10), M1 = ON i.e.
When identification code is K2040, M1 = ON
Y010
M8000
RUN
monitor
K2 K29 K4M10 K1
FNC78
FROM
M10
Block No.2 BFM #29 →(K4M10)
Transfer the error status to (M25 to M10).
When error is found, M10 = ON.
Represents b0 BFM #29
Y010
M8000 K2 K29 K4M10 K1
FNC78
FROM
M10
Y011
M20
Represents b0 BFM #29
Represents b10 BFM #29
(K4) →(BFM #1 to #4)
Number of samples is changed to four on CH1 to CH4.
(BFM #5 to #8) →(D0 to D3)
Transfer the averaged temperature value in °C to the
data registers.
This step is the actual reading of the FX
2N
-4AD-PT input channels. It is essentially
the only program step which is needed. The "TO" instruction in this example, sets
the input channels, CH1 to CH4, to take the average reading of four samples.
The "FROM" instruction reads the average temperatures (BFM #5 to #8) for input
channels CH1 to CH4 of the FX
2N
-4AD-PT. If direct temperature readings are
required BFM #9 to #12 should be read instead, ex.
9. DIAGNOSTICS
9.1 Preliminary checks
I. Check whether the input/output wiring and/or extension cables are properly connected on the FX2N-
4AD-PT analog special function block.
II. Check that the PLC system configuration limits have not been exceeded, i.e. the number of special
function blocks, and the total system I/O are within the specified range.
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 main unit or a powered extension unit varies according to the number of extension blocks or
special function blocks connected.
V. Make sure that the main unit has been switched to RUN.
9.2 Error checking
If the FX2N-4AD-PT 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 of the “24V” LED (top right corner of the FX2N-4AD-PT).
Lit :FX2N-4AD-PT is ON, 24V DC power source is ON.
Otherwise :Possible 24V DC power failure, if ON possible FX2N-4AD-PT failure.
• Check the status of the “A/D” LED (top right corner of the FX2N-4AD-PT).
Lit :A/D conversion is proceeding normally.
Otherwise :Check buffer memory #29 (error status). If any bits (b0, b2, b3) are ON, then this is why
the A/D LED is OFF.
10.EMC CONSIDERATIONS
Electromagnetic compatibility or EMC must be considered before using the FX2N-4AD-PT.
Mitsubishi recommend that the PT 100 sensors used, should be fitted with a form of seild or screening as
protection against EMC noise.
If some form of cable protection is used, the “Shield” must be terminated at the terminals
as shown in section 2.0.
Because of the delicate nature of all analog signals, failure to take good EMC precautions could lead to
EMC noise induced errors; up to ±10% of actual values. This is an absolute worst case figure, users who
do take good precautions can expect operation within normal tolerances.
EMC considerations should include selection of good quality cables, good routing of those cables away
from potential noise sources.
Additionally it is recommended that signal averaging is used as this will reduce the effects of random noise
“spikes”.
FG
Manual number: JY992D65601
Manual revision: B
Date : SEPTEMBER 2002