Sfar SFAR-S-8AO User manual

SFAR-S-8AO
User Manual
Expansion Module –8 Analog Outputs
Global Control 5 Sp. z o.o.
Warsaw, Poland
www.gc5.pl

SFAR-S-8AO User Manual
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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 ........................................................................................................ 6
3.3. Setting Module Address in RS485 Modbus Network................................................ 7
3.4. Types of Modbus Registers ........................................................................................... 7
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
3.5.4. Watchdog information.......................................................................................... 9
5.1. Block diagram .................................................................................................................10
5.2. Connection of analog output........................................................................................10
5.2.1. Connection of current output ............................................................................10
5.2.2. Connection of voltage output............................................................................ 11
5.3. Quick Connect .................................................................................................................11
9.1. Registered access..........................................................................................................14
9.2. Bit access.........................................................................................................................15

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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 judgment 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.

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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.
2. Module features
2.1. Purpose and description of the module
The 8AI2DO module has a set of 8 Analog Outputs that could work as a current output (0-
20mA or 4-20mA) or as a voltage output (0-10V). Setting the output current or voltage value
is done via RS485 (Modbus protocol), so you can easily integrate the module with popular
PLCs, HMI or PC equipped with the appropriate adapter.
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.

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2.2. Technical specifications
Power Supply
Voltage
10-38 V DC; 10-28 V AC
Power consumption1
1.25 W @ 24 V DC
1.5 VA @ 24 V AC
Isolation
Isolation between power supply and I/O
1000 V DC
Outputs
No of outputs
8
Voltage output
0 V do 10 V (resolution 1.5 mV)
Max. load current 0-10 V 5 mA
Accuracy ± 2%
Current output
0 mA - 20 mA (resolution 5 μA)
4 mA - 20 mA (value in ‰–1000 steps)
(resolution 16 μA)
Max. resistance 500 ohm
Accuracy ± 1%
Output resolution
12 bits
DAC processing time
16ms/channel
Temperature
Work
-10°C - +50°C (14°F to 122°F)
Storage
-40°C - +85°C (-40°F to 185°F)
Connectors
Power Supply
2 pins
Communication
3 pins
Outputs
2 x 10 pins
Quick connector
IDC10
Configuration
Mini USB
Size
Height
119.1 mm (4.689 in)
Length
110.9 mm (4.366 in)
Width
22.7 mm (0.894 in)
Interface
RS485
Up to 128 devices
Table 1 - Technical specifications
1
Power consumption with active Modbus transmission, all outputs on

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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
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.
3.2. Network termination
Transmission line effects often represent the problem of data communication networks.
Picture 1 - Dimensions of the product

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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 RS485 Modbus Network
3.4. Types of Modbus Registers
There are 4 types of variables available in the module

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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 3 - 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 4 - 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 cleared as well.
Baud rate
19200
Parity
No
Data bits
8
Stop bits
1
Reply Delay [ms]
0
Modbus Type
RTU

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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 5 - Configuration registers
3.5.4. Watchdog information
This 16-bits register specifies the time in milliseconds to watchdog reset. If module does not
receive any valid message within that time, all Digital and Analog Outputs will be set to the
default state.
This feature is useful if there is an interruption in data transmission and for security reasons.
Output states must be set to the appropriate state in order to reassure the safety of persons
or property.
The default value is 0 milliseconds which means the watchdog function is disabled.
4. Indicators

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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.
Outputs state
LED indicates that the output is on.
Table 6 - Descriptions of indicators
5. Module connection
5.1. Block diagram
5.2. Connection of analog output
5.2.1. Connection of current output
Picture 3 –Block diagram
Picture 2 - Indicators

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5.2.2. Connection of voltage output
5.3. 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 4 –Connection of current output
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Picture 5–Connection of voltage output

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6. Setting output mode
To change output mode from current to voltage you should set appropriate values of
registers (40069 –40076) and change the position of jumper inside the module according
to the following picture.
Picture 6–Connection of quick connect
Picture 7–Jumper setting

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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.
8. 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 8- Switches
Picture 8–Opening the case

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9. Modules Registers
9.1. 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)
40009
8
0x08
Watchdog
Read & Write
Watchdog
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
Outputs
Read
Bit is set if value ≠ 0
40053
52
0x34
Analog output 1
Read & Write
Value of Analog Output:
in mV for voltage output
(max 10240)
in μA for current output
0 –20 mA (max 20480)
in ‰for current output
4-20 mA (max 1000)
40054
53
0x35
Analog Output 2
Read & Write
40055
54
0x36
Analog Output 3
Read & Write
40056
55
0x37
Analog Output 4
Read & Write
40057
56
0x38
Analog Output 5
Read & Write
40058
57
0x39
Analog Output 6
Read & Write
40059
58
0x3A
Analog Output 7
Read & Write
40060
59
0x3B
Analog )utput 8
Read & Write
40061
60
0x3C
Default output 1 value
Read & Write
Default value of output set when power is on
or when watchdog reset occurs
40062
61
0x3D
Default output 2 value
Read & Write
40063
62
0x3E
Default output 3 value
Read & Write
40064
63
0x3F
Default output 4 value
Read & Write
40065
64
0x40
Default output 5 value
Read & Write
40066
65
0x41
Default output 6 value
Read & Write
40067
66
0x42
Default output 7 value
Read & Write
40068
67
0x43
Default output 8 value
Read & Write
40069
68
0x44
Output 1 setting
Read & Write
Setting of output mode:
40070
69
0x45
Output 2 setting
Read & Write

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Modbus
Dec
Hex
Register Name
Access
Description
40071
70
0x46
Output 3 setting
Read & Write
0 –output disabled
1 –voltage output
2 –current output 0-20 mA
3 –current output 4-20 mA
Caution! For the change to take effect, you
must also set the jumper inside the module.
40072
71
0x47
Output 4 setting
Read & Write
40073
72
0x48
Output 5 setting
Read & Write
40074
73
0x49
Output 6 setting
Read & Write
40075
74
0x4A
Output 7 setting
Read & Write
40076
75
0x4B
Output 8 setting
Read & Write
Table 8 - Registered access
9.2. Bit access
Modbus
Address
Dec
Address
Hex
Address
Register
name
Access
Description
801
800
0x320
Output 1
Read
If voltage or current is greater than 0 then according
bit is set.
802
801
0x321
Output 2
Read
803
802
0x322
Output 3
Read
804
803
0x323
Output 4
Read
805
804
0x324
Output 5
Read
806
805
0x325
Output 6
Read
807
806
0x326
Output 7
Read
808
807
0x327
Output 8
Read
Table 9 - Bit access
10. Configuration software
Modbus Configurator 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

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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 9 - Connection process
Picture 10 - Configurator