Aspar 8AI Manuale utente

RS485 MODBUS Module 8AI

Expansion Module – 8 analog inputs

Version 1 5 User Manual

Manufactured for

RS485 MODBUS Module 8AI

User Manual

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.

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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

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 10-38VDC; 10-28VAC

Maximum Current 120 mA @ 12V 100 mA @ 24V

Inputs

No of inputs 8

Voltage input 0V to 10V (resolution 1.5mV)

Voltage input -10V to 10V (resolution 1.5mV)

Voltage input 0V to 1V(resolution 0.1875mV)

Voltage input -1V to 1V(resolution 0.1875V)

Current input 4mA to 20mA (resolution 3.75μA)

Current input 0mA to 20mA (resolution 3.75μA)

Current input -20mA to 20mA (resolution 3.75μA)

Measurement resolution 14 bits

ADC processing time 16ms channel

Digital outputs Maximum current and voltage 500mA 55V

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 120 mm

Length 101 mm

Width 22,5 mm

Interface RS485 Up to 128 devices

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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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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 31. Addresses

From 32 to 255 can by 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

Addr SW5 SW4 SW3 SW2 SW1

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

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

Addr SW5 SW4 SW3 SW2 SW1

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

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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

Command

1 00001 Digital Outputs Bit

Read & Write 1, 5, 15

2 10001 Digital Inputs Bit

3 30001 Input Registers Registered

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 SW6 (see 3.5.2 - Restore

the default configuration)

Baud rate 19200

Parity No

Data bits 8

Stop bits 1

Reply Delay [ms] 0

Modbus Type RTU

3.5.2. Restore the default configuration

To restore the default configuration:

•turn off the power

•turn on the switch SW6

•turn on the power

•when power and communication LED flash turn off the switch SW6

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 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

4. ndicators

ndicator 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.

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1 2 3 4 5 6

Communication

Power Supply

2 digital outputs

state

8 inputs state

RS485 MODBUS Module 8AI

User Manual

5. Module Connection

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6. Selecting the input mode

Each input can be used to measure the voltage (the default) or current. To change the

operating mode in addition to configuration changes by using the program, also set the

jumpers inside the module as shown below

Jumper Description

off Voltage measurement

shorted Current measurement

7. 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).

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