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Configuration manual

Basic information

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

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

This is DIP switch function diagram for IEC protocol. For enable IEC 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 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

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EC60870-5-101 Implementation Guide

Protocol Overview

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

Reading States (Interrogation)
  • C_IC_NA_1 (100)
  • Reading all inputs and outputs states
    • Inputs: 1000-1007
    • Outputs: 2000-2003
Controlling Outputs
  • Function: C_SC_NA_1 (45)
  • Purpose: Setting individual output states
  • IOA range: 2000-2003
  • Values: ON (1) / OFF (0)

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
  • Common Address (ASDU): 1
  • Frame format: FT1.2
  • Link Layer Address: according to device configuration
I/O Points Configuration:

For inputs (8 channels):

  • Type: Single Point Information (M_SP_NA_1)
  • IOA addresses: 1000-1007
  • Direction: Monitoring (read)

For outputs (4 channels):

  • Type: Single Command (C_SC_NA_1)
  • IOA addresses: 2000-2003
  • Direction: Control (write)

Verification:

  • Check if input states are correctly read (IOA 1000-1007)
  • Confirm control operation for each output (IOA 2000-2003)
  • Verify device responds to General Interrogation

 

 

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