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 115 Kbaud 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