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 |