Modbus RTU with the serial \ interfaces COM1 and COM2

Both serial interfaces of the Processor Modules can be operated simultaneously as Modbus interfaces and can operate as Modbus server as well as Modbus client.

The Modbus operating mode and the interface parameters are set in the PLC Configuration (Controller configuration / Modbus AC500 PLC Configuration).

Description of the Modbus® protocol:

Supported standard	PM55x and PM56x: EIA RS-485 PM57x, PM58x and PM59x: EIA RS-232 / RS-485
Number of connection points	1 server Max. 1 client with RS-232 interface Max. 31 clients with RS-485
Protocol	Modbus® (server/client)
Data transmission control	CRC16
Data transmission speed	Up to 187.500 baud
Encoding	1 start bit 8 data bits 1 parity bit, even or odd (optional) 1 or 2 stop bits
Max. cable length for RS-485	1.200 m at 19.200 baud