Aspar SDM-8AI Manual de usuario
SDM-8AI
Expansion Module – 8 analog inputs
Version 1.2 User Manual
Manufactured for
SDM-8AI
User Manual
Expansion Module – 8 analog inputs
User Manual Version 1.2 2 / 18
Thank you for choosing our product.
This manual will help you with proper support and proper operation of the device.
The information contained 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 release you from the obligation of own judgement and
verification.
We reserve the right to change product specifications without notice.
Please read the instructions carefully and follow the recommendations contained
therein.
WAR I G!
Failure to follow instructions can result in equipment damage or impede
the use of the hardware or software.
SDM-8AI
User Manual
1. Safety rules
•Before first use, refer to this manual
•Before first use, make sure that all cables are connected properly
•Please ensure proper working conditions, according to the device specifications
(eg: supply voltage, temperature, maximum power consumption)
•Before making any modifications to wiring connections, turn off the power supply
2. Module Features
2.1. Purpose and description of the module
SDM-8AI 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 input 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 DI rail in accordance with DI E 5002.
The module is equipped with a set of LEDs used to indicate the status of inputs and
outputs 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 10-30 VDC; 10-28VAC
Maximum Current*DC 52 mA @ 24VDC
AC 62 mA @ 24VAC
Maximum power consumption DC 1,25W; AC 1,5VA
Inputs
No of inputs 8
Voltage input 0V do 10V (resolution 1.5mV)
Voltage input -10V do 10V (resolution 1.5mV)
Voltage input 0V do 1V(resolution 0.1875mV)
Voltage input -1V do 1V(resolution 0.1875V)
Current input 4mA do 20mA (resolution 3.75μA)
Current input 0mA do 20mA (resolution 3.75μA)
Current input -20mA do 20mA (resolution 3.75μA)
Measurement resolution 14 bits
ADC processing time 16ms / channel
Isolation 1500 Vrms
Digital outputs Maximum current and voltage 500mA / 55V
Isolation 1500 Vrms
Te perature Work -10 °C - +50°C
Storage -40 °C - +85°C
Connectors
Power Supply 2 pins
Communication 3 pins
Inputs & Outputs 2 x 10 pins
Configuration Mini USB
Size
Height 110 mm
Length 62 mm
Width 88 mm
Interface RS485 Up to 128 devices
* Maximum current with active Modbus transmission, all inputs connected and all output active
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2.3. Dimensions of the product
Look and dimensions of the module are shown below. The module is mounted directly
to the rail in the DI 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.
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45
35
110
4
8
,
5
6
2
6
42,3
91
110
88
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3. Communication configuration
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 present a problem on data communication networks.
These problems include reflections and signal attenuation.
To eliminate the presence of reflections from 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 an RS485 twisted pair cable this termination is typically
120 Ω.
3.3. Setting Module ddress 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 127. Addresses From
128 to 255 can by set via RS485 or USB.
Switch Address
SW1 +1
SW2 +2
SW3 +4
SW4 +8
SW5 +16
SW6 +32
SW7 +64
Ex. if switches 1, 3 and 5 are on than module addres is:
Address = 1 + 4 + 16 = 21
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3.4. Types of Modbus Registers
There are 4 types of variables available in the module
Type Beginning
address Variable Access Modbus
Co and
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
3.5. Communication settings
The data stored in the modules memory are in 16-bit registers. Access to registers is
via MODBUS RTU or MODBUS ASCII.
3.5.1. Default settings
You can restore the default configuration by the switch SW8 (see 3.5.2 - Restore the
default configuration)
Baud rate 19200
Parity No
Data bits 8
Stop bits 1
Reply Delay [ s] 0
Modbus Type RTU
3.5.2. Restore the default configuration
To restore the default configuration:
•turn off the power
•turn on the switch SW8
•turn on the power
•when power and communication LED start blinking alternately than turn off the
switch SW8
Caution After restoring the default configuration all values stored in the registers will
be cleared as well.
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3.5.3. Configuration registers
Modbus Dec Hex Na e Values
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
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4. Switches
Switch Function Description
1 Module address +1
Setting module address from 0 to 127
2 Module address +2
3 Module address +4
4 Module address +8
5 Module address +16
6 Module address +32
7 Module address +64
8 Restoring default settings Restoring default settings
(see 3.5.2 - Restore the default configuration).
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ON
SDM-8AI
User Manual
5. Front panel removing
To remove the panel and gain access to the switch, you must pry open the panel using
a thin tool (eg a small screwdriver) as in the picture below.
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