Modbus SFAR-S-8AI2DO User manual
SFAR-S-8AI2DO
User Manual
Expansion Module –8 Analog Inputs,
2 Digital Outputs
Global Control 5 Sp. z o.o.
Warsaw, Poland
www.gc5.pl
SFAR-S-8AI2DO User Manual
Version 3.0 www.gc5.pl Page 2/ 18
Table of contents
2.1. Purpose and description of the module....................................................................... 4
2.2. Technical specifications ................................................................................................. 5
2.3. Dimensions of the product ............................................................................................. 6
3.1. Grounding and shielding ................................................................................................. 6
3.2. Network termination........................................................................................................ 7
3.3. Setting Module Address in RS485 Modbus Network................................................ 7
3.4. Types of Modbus registers............................................................................................. 8
3.5. Communication settings ................................................................................................ 8
3.5.1. Default settings...................................................................................................... 8
3.5.2. Restore the default configuration....................................................................... 8
3.5.3. Configuration registers......................................................................................... 9
5.1. Block diagram .................................................................................................................10
5.2. Connection of analog inputs ........................................................................................10
5.2.1. Connection of current measurement...............................................................10
5.2.2. Connection of voltage measurement .............................................................. 11
5.3. Connection of digital outputs.......................................................................................11
5.3.1. Connection of PNP output ................................................................................. 11
5.3.2. Connection of NPN output................................................................................. 11
5.4. Quick Connect.................................................................................................................12
10.1. Registered access ...................................................................................................15
10.2. Bit access..................................................................................................................17
SFAR-S-8AI2DO User Manual
Version 3.0 www.gc5.pl Page 3/ 18
Thank you for choosing our product.
This manual will help you with proper handling and operating of the device.
The information included in this manual have been prepared with utmost care by our
professionals and serve as a description of the product without incurring any liability for the
purposes of commercial law.
This information does not discharge you from the liability of your own judgement and
verification.
We reserve the right to change product specifications without notice.
Please read the instructions carefully and follow the recommendations concluded therein.
WARNING!
Failure to follow instructions can result in equipment damage or impede the use of the
hardware or software.
SFAR-S-8AI2DO User Manual
Version 3.0 www.gc5.pl Page 4/ 18
1. Safety rules
1. Refer to this manual before the first use.
2. Make sure that all cables are connected properly before the first use.
3. Please ensure proper working conditions, according to the device specifications
(e.g., supply voltage, temperature, maximum power consumption)
4. Turn the power supply off before making any modifications to wiring connections, turn
off the power supply
2. Module features
2.1. Purpose and description of the module
SFAR-S-8AI2DO module allows measurement of voltages and currents. Values are read via
RS485 (Modbus), so we can easily integrate the module with popular PLCs, HMI or PC
equipped with the appropriate adapter.
The device has a set of 8 Analog Inputs measurements. In addition, the module is
equipped with 2 configurable Digital Outputs.
This module is connected to the RS485 bus with twisted-pair wire. Communication is via
Modbus RTU or Modbus ASCII. The use of 32-bit ARM core processor provides fast
processing and quick communication. The baud rate is configurable from 2400 to 115200.
The module is designed for mounting on a DIN rail in accordance with DIN EN 5002.
The module is equipped with a set of LEDs to indicate the status of inputs and outputs which
is useful for diagnostic purposes and helping to find errors.
Module configuration is done via USB by using a dedicated computer program. You can also
change the parameters using the Modbus protocol.
SFAR-S-8AI2DO User Manual
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2.2. Technical specifications
Power Supply
Voltage
10-38 V DC; 10-28 V AC
Power consumption1
2.4 W @ 24 V DC
3 VA @ 24 V AC
Isolation
Isolation between power supply and I/O
1000 V DC
Inputs
No of inputs
8
Absolute maximum input voltage
± 30 V
Voltage input impedance
120 kΩ
Voltage measurement accuracy
± 0.2 %
Voltage input mode
0 –10 V
-10 –10 V
Max voltage
± 12.288 V
Resolution
1.5 mV
Voltage input mode
0 –1 V
-1 – 1 V
Max voltage
± 3.072 V
Max voltage
1 mV
Absolute maximum input current
± 35 mA
Current input impedance
100 Ω
Current measurement accuracy
± 0.2 %
Current input mode
0 –20 mA
-20 – 20 mA
Max current
± 30.72 mA
Resolution
3.75 μA
Current input mode
4 –20 mA
Max current
20 mA
Resolution
1 ‰
ADC processing time
16 ms / channel
Digital outputs
Maximum current and voltage
500 mA / 55 V
Temperature
Work
-20°C - +65°C
Storage
-40°C - +85°C
Connectors
Power Supply
2 pin
Communication
3 pin
Inputs & Outputs
2 x 10 pin
Quick connector
IDC10
Configuration
Mini USB
Size
Height
119.1 mm
Length
101 mm
Width
22.6 mm
Interface
RS485
Up to 128 devices
1
Power consumption with active Modbus transmission, all outputs on and high state on all inputs
SFAR-S-8AI2DO User Manual
Version 3.0 www.gc5.pl Page 6/ 18
Table 1 - Technical specifications
2.3. Dimensions of the product
The appearance and dimensions of the module are shown below. The module is mounted
directly to the rail in the DIN industry standard. Power connectors, communication and IOs
are at the bottom and top of the module. USB connector configuration and indicators are
located on the front of the module.
3. Configurating of the communication
3.1. Grounding and shielding
In most cases, IO modules will be installed in an enclosure along with other devices which
generate electromagnetic radiation. Examples of these devices are relays and contactors,
transformers, motor controllers etc. This electromagnetic radiation can induce electrical
noise into both power and signal lines, as well as direct radiation into the module causing
negative effects on the system. Appropriate grounding, shielding and other protective steps
should be taken at the installation stage to prevent these effects. These protective steps
include control cabinet grounding, module grounding, cable shield grounding, protective
elements for electromagnetic switching devices, correct wiring as well as consideration of
cable types and their cross sections.
Picture 1 - Dimensions of the product
SFAR-S-8AI2DO User Manual
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3.2. Network termination
Transmission line effects often represent the problem of data communication networks.
These problems include reflections and signal attenuation.
To eliminate the presence of reflections at the end of the cable, the cable must be terminated
at both ends with a resistor across the line equal to its characteristic impedance. Both ends
must be terminated since the direction of propagation is bi-directional. In the case of RS485
twisted pair cable this termination is typically 120 Ω.
3.3. Setting Module Address in RS485 Modbus Network
The following table shows how to set switch to determine the address of the module. The
module address is set with the switches in the range of 0 to 31. Addresses from 32 to 255
can be set via RS485 or USB.
Addr
SW5
SW4
SW3
SW2
SW1
0
OFF
OFF
OFF
OFF
OFF
1
OFF
OFF
OFF
OFF
ON
2
OFF
OFF
OFF
ON
OFF
3
OFF
OFF
OFF
ON
ON
4
OFF
OFF
ON
OFF
OFF
5
OFF
OFF
ON
OFF
ON
6
OFF
OFF
ON
ON
OFF
7
OFF
OFF
ON
ON
ON
8
OFF
ON
OFF
OFF
OFF
9
OFF
ON
OFF
OFF
ON
10
OFF
ON
OFF
ON
OFF
11
OFF
ON
OFF
ON
ON
12
OFF
ON
ON
OFF
OFF
13
OFF
ON
ON
OFF
ON
14
OFF
ON
ON
ON
OFF
15
OFF
ON
ON
ON
ON
Addr
SW5
SW4
SW3
SW2
SW1
16
ON
OFF
OFF
OFF
OFF
17
ON
OFF
OFF
OFF
ON
18
ON
OFF
OFF
ON
OFF
19
ON
OFF
OFF
ON
ON
20
ON
OFF
ON
OFF
OFF
21
ON
OFF
ON
OFF
ON
22
ON
OFF
ON
ON
OFF
23
ON
OFF
ON
ON
ON
24
ON
ON
OFF
OFF
OFF
25
ON
ON
OFF
OFF
ON
26
ON
ON
OFF
ON
OFF
27
ON
ON
OFF
ON
ON
28
ON
ON
ON
OFF
OFF
29
ON
ON
ON
OFF
ON
30
ON
ON
ON
ON
OFF
31
ON
ON
ON
ON
ON
Table 2 – Setting Module Address in RS 485 Modbus Network
3.4. Types of Modbus registers
There are 4 types of variables available in the module
Type
Beginning address
Variable
Access
Modbus
Command
1
00001
Digital Outputs
Bit
Read & Write
1, 5, 15
2
10001
Digital Inputs
Bit
Read
2
3
30001
Input Registers
Registered
Read
3
4
40001
Output Registers
Registered
Read & Write
4, 6, 16
Table 2 - Types of variables
3.5. Communication settings
The data stored in the module’s memory is given in the 16-bit registers. The access to
registers happens via Modbus RTU or Modbus ASCII.
3.5.1. Default settings
You can restore the default configuration by the switch SW6 (see 3.5.2 - Restore the default
configuration)
Table 3 - Default settings
3.5.2. Restore the default configuration
To restore the default configuration:
•turn the power off
•turn the switch SW6 on
•turn the power on
•when power and communication LED flash turn the switch SW6 off
WARNING! After restoring the default configuration all values stored in the registers will be
Baud rate
19200
Parity
No
Data bits
8
Stop bits
1
Reply Delay [ms]
0
Modbus Type
RTU
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cleared as well.
3.5.3. Configuration registers
Modbus
Dec
Hex
Name
Values
Address
40003
2
0x02
Baud rate
0 – 2400
1 – 4800
2 – 9600
3 – 19200
4 – 38400
5 – 57600
6 – 115200
other – value * 10
40005
4
0x04
Parity
0 – none
1 – odd
2 – even
3 – always 1
4 – always 0
40004
3
0x03
Stop Bits LSB
1 – one stop bit
2 – two stop bits
40004
3
0x03
Data Bits MSB
7 – 7 data bits
8 – 8 data bits
40006
5
0x05
Response delay
Time in ms
40007
6
0x06
Modbus Mode
0 – RTU
1 – ASCII
Table 4 - Configuration registers
4. Indicators
Picture 2 - Indicators
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5. Module connection
5.1. Block diagram
5.2. Connection of analog inputs
5.2.1. Connection of current measurement
Indicator
Description
Power supply
LED indicates that the module is correctly powered.
Communication
The LED lights up when the unit received the correct packet and sends the answer.
Inputs state
LED indicates that the signal to input is connected.
Outputs state
LED indicates that the output is on.
Table 5 - Description of indicators
Picture 3 – Block diagram
Picture 4 – Connection of current measurement
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5.2.2. Connection of voltage measurement
5.3. Connection of digital outputs
5.3.1. Connection of PNP output
5.3.2. Connection of NPN output
Picture 5 – Connection of voltage measurement
Picture 6 – Connection of PNP output
Table 6 – Connection of NPN output
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5.4. Quick Connect
Quick Connect is an unique feature of modules that allows you to quickly connect group of
devices with a flat ribbon cable. Thanks to this solution, it is enough to connect power and
RS485 communication to one of the devices in the group and the others will be powered and
communicated with ribbon cable.
The Quick Connect is sufficient to connect up to 10 devices next to each other. What is
important that the various types of modules in the SFAR-S family can be connected with the
ribbon cable .
Picture 8 – Connection of quick connect
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6. Selecting the input mode
Each input can be used to measure the voltage - the default or the current one. To change
the operating mode it is necessary to modify software settings as well as position of the
jumpers inside the module as shown below.
7. Opening the case
1.Remove the catch by pressing it and moving it towards the center of the case. Mind the
spring located under the catch.
2.Seperate parts of the case by gently tilting catches located as shown in the picture using
thin tool.
Picture 9 – Jumper setting
Picture 10 – Opening the case
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8. Analog filtering
If the measured signal is interrupted it is possible to eliminate the disruptions by switching
the lowpass filter on. It is possible to configure the filter for all inputs (it is not possible to
enable the filter for only one input). The filter parameter corresponds to the filter time
constant. Step response of the filter is shown in the graph below.
9. Switches
Switch
Function
Description
1
Module address +1
Setting module address from 0 to 31
2
Module address +2
3
Module address +4
4
Module address +8
5
Module address +16
6
Restoring default settings
Restoring default settings
( see 3.5.1 - Default settings and 3.5.2 - Restore the default
configuration).
Table 7 - Description of switches
Picture 11- Switches
0
20
40
60
80
100
120
012345678
[%]
t [s]
Filter step response
12510
Chart 1- Step response add different coefficients
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10. Modules Registers
10.1. Registered access
Modbus
Dec
Hex
Register Name
Access
Description
30001
0
0x00
Version/Type
Read
Version and Type of the device
30002
1
0x01
Switches
Read
Switches state
40003
2
0x02
Baud rate
Read & Write
RS485 baud rate
40004
3
0x03
Stop Bits & Data Bits
Read & Write
No of Stop bits & Data Bits (see 3.5.3)
40005
4
0x04
Parity
Read & Write
Parity bit
40006
5
0x05
Response Delay
Read & Write
Response delay in ms
40007
6
0x06
Modbus Mode
Read & Write
Modbus Mode (ASCII or RTU)
40010
9
0x09
Analog filtering
Read & Write
Analog filtering configuration
see 8.Analog filtering
40033
32
0x20
Received packets
MSB
Read & Write
No of received packets
40034
33
0x21
Received packets
LSB
Read & Write
40035
34
0x22
Incorrect packets
MSB
Read & Write
No of received packets with error
40036
35
0x23
Incorrect packets LSB
Read & Write
40037
36
0x24
Sent packets MSB
Read & Write
No of sent packets
40038
37
0x25
Sent packets LSB
Read & Write
30051
50
0x32
Inputs
Read
Connected inputs
Bit in high state → signal is connected
40052
51
0x33
Outputs
Read & Write
Alarms state
bit 9 and 10 alarm outputs
30053
52
0x34
Analog 1
Read
Value of Analog Input
in mV for voltage inputs
in μA for current inputs
30054
53
0x35
Analog 2
Read
30055
54
0x36
Analog 3
Read
30056
55
0x37
Analog 4
Read
30057
56
0x38
Analog 5
Read
30058
57
0x39
Analog 6
Read
30059
58
0x3A
Analog 7
Read
30060
59
0x3B
Analog 8
Read
30061
60
0x3C
Value of 1. alarm
input
Read
Current values of voltage / current for
alarm inputs
30062
61
0x3D
Value of 2. alarm
input
Read
40063
62
0x3E
MAX alarm level 1
Read & Write
If the analog signal exceeds this value the
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Modbus
Dec
Hex
Register Name
Access
Description
40064
63
0x3F
MAX alarm level 2
Read & Write
corresponding alarm flag is set
40065
64
0x40
MAX alarm level 3
Read & Write
40066
65
0x41
MAX alarm level 4
Read & Write
40067
66
0x42
MAX alarm level 5
Read & Write
40068
67
0x43
MAX alarm level 6
Read & Write
40069
68
0x44
MAX alarm level 7
Read & Write
40070
69
0x45
MAX alarm level 8
Read & Write
40071
70
0x46
MIN alarm level 1
Read & Write
If the analog signal is below this value
corresponding alarm flag is set
40072
71
0x47
MIN alarm level 2
Read & Write
40073
72
0x48
MIN alarm level 3
Read & Write
40074
73
0x49
MIN alarm level 4
Read & Write
40075
74
0x4A
MIN alarm level 5
Read & Write
40076
75
0x4B
MIN alarm level 6
Read & Write
40077
76
0x4C
MIN alarm level 7
Read & Write
40078
77
0x4D
MIN alarm level 8
Read & Write
40079
78
0x4E
Alarm settings 1
Read & Write
Alarm settings
0 – alarm due to the current analog signal value
1 – Remember the value of the alarm, until reset by the
master via Modbus
40080
79
0x4F
Alarm settings 2
Read & Write
40081
80
0x50
Alarm settings 3
Read & Write
40082
81
0x51
Alarm settings 4
Read & Write
40083
82
0x52
Alarm settings 5
Read & Write
40084
83
0x53
Alarm settings 6
Read & Write
40085
84
0x54
Alarm settings 7
Read & Write
40086
85
0x55
Alarm settings 8
Read & Write
40087
86
0x56
Input 1 settings
Read & Write
Analog input mode:
0 – input disabled
1 – voltage 0 V to 10 V
2 – voltage -10 V to 10 V
3 – voltage 0 V to 1 V
4 – voltage -1 V to 1 V
5 – current 4 mA to 20 mA
6 – current 0 mA to 20 mA
7 – current -20 mA to 20 mA
To change the input mode you must to set
jumper inside of module (see 6. Selecting the
input mode)
40088
87
0x57
Input 2 settings
Read & Write
40089
88
0x58
Input 3 settings
Read & Write
40090
89
0x59
Input 4 settings
Read & Write
40091
90
0x5A
Input 5 settings
Read & Write
40092
91
0x5B
Input 6 settings
Read & Write
40093
92
0x5C
Input 7 settings
Read & Write
40094
93
0x5D
Input 8 settings
Read & Write
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Modbus
Dec
Hex
Register Name
Access
Description
40095
94
0x5E
Output 1 settings
Read & Write
Alarm output settings
0 – output is set by PLC
+1 – value from input 1
+2 – value from input 2
+4 – value from input 3
+8 – value from input 4
+16 – value from input 5
+32 – value from input 6
+64 – value from input 7
+128 – value from input 8
+256 – Output is set if value is greater than Alarm
Value (register 40097 or 40098) („cooling”)
+512 – Output is set if value is less than Alarm Value
( register 40097 or 40098) („heating”)
+1024 – The lowest value from selected inputs
+2048 – The greatest value from selected inputs
(if not select either of the two above options than is
used average value of selected inputs)
40096
95
0x5F
Output 2 settings
Read & Write
40097
96
0x60
Alarm Value 1
Read & Write
Alarm value for outputs
40098
97
0x61
Alarm Value 2
Read & Write
40099
98
0x62
Alarm hysteresis 1
Read & Write
The hysteresis value for alarm outputs
40100
99
0x63
Alarm hysteresis 2
Read & Write
Table 8 - Registered access
10.2. Bit access
Modbus
Address
Dec
Address
Hex
Address
Register name
Access
Description
801
800
0x320
Input 1
Read
Set when the input is connected
802
801
0x321
Input 2
Read
Set when the input is connected
803
802
0x322
Input 3
Read
Set when the input is connected
804
803
0x323
Input 4
Read
Set when the input is connected
805
804
0x324
Input 5
Read
Set when the input is connected
806
805
0x325
Input 6
Read
Set when the input is connected
807
806
0x326
Input 7
Read
Set when the input is connected
808
807
0x327
Input 8
Read
Set when the input is connected
817
816
0x330
Alarm 1
Read
Alarm state 1
818
817
0x331
Alarm 2
Read
Alarm state 2
819
818
0x332
Alarm 3
Read
Alarm state 3
820
819
0x333
Alarm 4
Read
Alarm state 4
821
820
0x334
Alarm 5
Read
Alarm state 5
822
821
0x335
Alarm 6
Read
Alarm state 6
823
822
0x336
Alarm 7
Read
Alarm state 7
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Modbus
Address
Dec
Address
Hex
Address
Register name
Access
Description
824
823
0x337
Alarm 8
Read
Alarm state 8
825
824
0x338
Digital output 1
Read & Write
State of digital output 1
826
825
0x339
Digital output 1
Read & Write
State of digital output 2
Table 9 - Bit access
11. Software configuration
Modbus Configurator is the type of software which is designed to set the
communication module registers over Modbus network as well as to read and
write the current value of other registers of the module. It’ s a convenient way to
test the system as well as to observe real-time changes in the registers.
Communication with the module happens via the USB cable. The module does not
require any drivers.
Configurator is an universal software, whereby it is possible to configure all
available modules
Picture 11- Configuration process
Picture 12 - Configurator
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