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Modicon Modbus protocol driver ID:20


Interface Description

IGSS offers an interface for the Modicon PLC series and Modbus compatible systems using the Serial Modbus RTU and ASCII protocols.

The communication driver uses standard RS-232 serial ports to connect to up to 8 PLCs. Each of these PLCs may in turn be connected to other devices (e.g. other PLCs) via a separate network (e.g. Modbus or Modbus Plus networks)

The communication interface supports both direct and dial-up connections.

The IGSS system polls the PLC equipment cyclically according to one of four user-defined time intervals. The time intervals are configurable from 100 milliseconds to 999 seconds. The system automatically groups process data in data blocks - thus fully exploiting the communication link in relation to the present configuration.

Technical Data

Electrical Interface:RS-232 point-to-point connection
Protocol:Modbus RTU/ASCII
Types of data:String, Fixed point 8, 16, 32, BCD 16, 32, Floating Point etc.
PLC types supported:All PLCs supporting AEG Modicon Modbus RTU/ASCII protocol. E.g. Milltronics Enviroranger ERS 500, GRUNDFOS CU401 Controller
Addressing:Node (PLC), data type (Coils, Discrete Input, Word Inputs, and Holding Registers), offset , bit offset (a whole number of words is read or written)
Supported platforms:Windows Vista, Windows XP, Windows 2003 Server, Windows 2000
Max. telegram size:Up to 250 bytes per telegram
Transmission speed:Up to 115Kbaud depending on the PLC port speed
Throughput:3-4 telegrams per PLC per second (depending on baudrate)
Max. number of channels:Up to 8 connections are supported concurrently
PC hardware requirements:1-8 standard serial ports (COM ports). Standard modem(s) if dialled-up connections are used
PC software requirements:None