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The Modbus protocol is a communications protocol based on a master/slave or client/server architecture. It is an open protocol, which was developed by Gould-Modicon in 1979 for communication between programmable logic controllers.
The Modbus TCP version has been part of the standard IEC 61158 since 2007.

Structure of a Modbus network

The Modbus protocol was originally developed for serial communication between devices. One master and multiple slaves can be connected in a Modbus network.
A distinction is made between three operating modes:

  • Modbus ASCII
  • Modbus RTU
  • Modbus TCP

Each subscriber has a unique address, whereby the address 0 is reserved for broadcast. The subscribers send their messages via the bus.

The following product groups have a Modbus interface:

Configurable safety system PNOZmulti - Communication modules

Configurable small control system PNOZmulti Mini - Communication modules

Configurable control system PNOZmulti 2 - Communication module

Control systems PSSuniversal PLC and PSSuniversal multi


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