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Brief description of the functional devices
33003405 07/2007 71
The above application shows the communication between a Safety PLC and a
Premium PLC over Ethernet (Modbus TCP/IP protocol) and Ethernet using
SafeEthernet protocol. The data exchange between the Safety PLC and the
Premium PLC is non-safety data transfer. The two systems can work together
sending and receiving data in both directions using Modbus TCP/IP protocol. In this
case, it allows non-safe data transfer over Ethernet through the Safety PLC.
Now, the data from a safety-related input can control a safety output within the
Safety PLC system and a non-safety output through the Premium PLC system. The
PLC system can transmit its non-safe data over Ethernet controlling a non-safety-
related output. This allows the cabling system to be used to transfer both safe and
non-safe data.