Interface Description

The IGSS32 Saia P8 communication interface offers connection to all Saia PLCs supporting the P8 protocol. Saia P8 protocol is a point-to-point protocol used to communicate via an asynchronious serial RS-232C interface with external devices such as PCs.

The IGSS32 Saia P8 communication driver connects directly to the PGU port. Additional serial ports can also be used but requires that the “Saia Mode” of the port is set to “SDO”.

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

The IGSS32 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 the communication link in relation to the present configuration.

Technical Data

Electrical Interface : RS232
Protocol : Saia P8
Types of data : String, Fixed point 8, 16, 32, BCD 16, 32, IEEE Float, P8 Float and integer.
PLC types supported : All PLC types supporting the Saia P8 Protocol.
Addressing : Node (PLC), data type (Register (16 and 32 bit), input, output, flags, timer and counter), Type index, bit offset.
Supported platforms : Windows Vista, Windows XP, Windows 2003 Server, Windows 2000
Max. telegram size : 64 bytes pr. Telegram
Transmission speed : Up to 115Kbaud depending on the PLC port speed
Communication mode : Half duplex
Throughput : Up til 4 telegrams pr. Channel pr. Second (depending on available bandwidth).
Max. number of channels : Up to 8 COM ports are supported concurrently.
Max. number of nodes : 1 pr. COM port
PC hardware requirements : 1-8 standard serial ports (COM ports). Standard modem(s) if dialled-up is used.
PC software requirements : None