AMB-8I-4O Expander

The AMB-8I-4O input/output expander with Modbus RTU and IEC-60870-5-101 protocol support (under development). It has 8 isolated digital inputs with voltage range up to 30VDC and 4 relay output with 5A 230V range and NO contacts. The power supply range is 8 to 48V DC. The use of DC / DC technology for supplying relays enables a wide range of supply voltages.

Please read carefully before starting. Also read the product safety information.

General information

Download technical specification Technical Specification

The AMB-8I-4O input/output expander with Modbus RTU and IEC-60870-5-101 protocol support. (under development). It has 8 isolated digital inputs with voltage range up to 30VDC and 4 relay output with 5A 230V range and NO contacts. The power supply range is 8 to 48V DC. The use of DC / DC technology for supplying relays enables a wide range of supply voltages.


Connection information

Below is a description of the expander connectors. The outputs of the expander are directly connected to the relay leads. The relays are of normal open type.

AMB-8I-4O connectors.png


Wiring

The expander has opto-isolated inputs that require an external Voltage source in range of a 5-30V. The inputs can be driven by both positive and negative signals. Both examples are shown in the attached diagram.

The outputs of the expander are directly connected to the relay leads. The relays are of normal open type.

AMB-8I-4O wiring.png

Configuration Manual

Configuration

AMB-8I-4O is an I/O expander operating over Modbus RTU and IEC60870-5-101 protocol. The first DIP switch is used to switch between Modbus RTU and IEC modes. If it is in position 0, then the AMB is operating in Modbus RTU mode. If it is in position 1, then it works in the IEC protocol. As the two protocols have different functions, the DIP switch is also different. In IEC mode, the last DIP switch is used to change the operating mode from balanced/unbalanced. To save the DIP switch settings in the internal memory, the SAVE button must be pressed.

Configuration Manual

Configuration IEC60870

DIP switch configuration

This is DIP switch functions diagram for Modbus RTU configuration. For enable IEC60870 protocol 1 switch should be in ON position.

AMB-8I-4O-DIP-2.png

Parity configuration

Parity configuration for both Modbus and IEC.

Parity Function
00
NONE
01
ODD
10
EVEN
11
NONE

Baudrate configuration

Baudrate configuration for both Modbus and IEC

Switch Baudrate
0000
9600
0001
1200
0010
2400
0011
4800
0100
14400
0101
19200
0110
28800
0111 38400
1000
57600
1001
76800
1010
115200
1011
230400
1100
256000
1101
460800
1110
576000
1111
921600

Address configuration for IEC
Switch Value IEC Address
0000
0 1
0001
1 2
0010
2 3
0011
3 4
0100
4 5
0101
5 6
0110
6 7
0111 7 10
1000
8 20
1001
9 30
1010
10 40
1011
11 50
1100
12 60
1101
13 70
1110
14 80
1111
15 90

EC60870-5-101 Implementation Guide

Protocol Overview

The device implements IEC60870-5-101 protocol with the following key functions:

Reading States (Interrogation)
Controlling Outputs

Command Structure

General Interrogation Command
Type ID: 100 (C_IC_NA_1)
Qualifier: 20
Cause of Transmission: 6 (Activation)
Common Address: 1
Single Command (Output Control)
Type ID: 45 (C_SC_NA_1)
Cause of Transmission: 6 (Activation)
Common Address: 1
IOA: 2000-2003
Value: 0/1

SCADA system configuration

IEC60870-5-101 Protocol Configuration
I/O Points Configuration:

For inputs (8 channels):

For outputs (4 channels):

Verification:

 

Configuration Manual

Configuration Modbus

DIP switch configuration

This is DIP switch functions diagram for Modbus RTU configuration. For enable Modbus RTU protocol 1 switch should be in OFF position.

AMB-8I-4O-DIP-1.png


Baudrate configuration

Baudrate configuration for both Modbus and IEC

Switch Baudrate
0000
9600
0001
1200
0010
2400
0011
4800
0100
14400
0101
19200
0110
28800
0111 38400
1000
57600
1001
76800
1010
115200
1011
230400
1100
256000
1101
460800
1110
576000
1111
921600

Address configuration for Modbus RTU
Switch Value Modbus Address
00000 0
1
00001 1
2
00010 2
3
00011 3
4
00100 4
5
00101 5
6
00110 6
7
00111 7
10
01000 8
20
01001 9
30
01010 10
40
01011 11
50
01100 12
60
01101 13
70
01110 14
80
01111 15
90
10000 16
100
10001 17
110
10010 18
120
10011 19
130
10100 20
140
10101 21
150
10110 22
160
10111 23
170
11000 24
180
11001 25
190
11010 26
200
11011 27
210
11100 28
220
11101 29
230
11110 30
240
11111 31
250

Safety information

Operating environment

Use in inappropriate conditions may damage the device or shorten its life.


Electrical and power supply safety

Only a person with qualification and appropriate knowledge should install the device.


Malfunctioning and damaged device

What to do and what not to do