In a PROFINET system, the SAFETY SLC 400 PND-4TX-IB can be used as a PROFINET device under the ILC 390 PN 2TX-IB. The proxy with a safe control system adopts the function of a link between the higher-level PROFINET system and a lower-level INTERBUS Safety system or a standard INTERBUS system there. In an INTERBUS Safety system as well as in a standard INTERBUS system, this SAFETY SLC 400 PND-4TX-IB adopts the function of a master (refer to DIN EN 50254) which controls, monitors and diagnoses the entire INTERBUS structure and is responsible for the data exchange from and to a PROFINET controller. The SAFETY SLC 400 PND-4TX-IB adds freely programmable safety functions to a standard INTERBUS system along with safe INTERBUS I/O devices. In addition to the proxy function that is used for connecting INTERBUS to ILC 390 PN 2TX-IB, the SAFETY SLC 400 PND-4TX-IB also comprises a safe control system part - the integrated safe control system. This safe control system processes the input data of the safe INTERBUS I/O devices and the output data of the standard control system in accordance with the safety programming (refer to the description of the "Enable principle" in the UM DE INTERBUS-SAFETY SYS manual) for safe output data. The proxy transfers the input data of the non-safe INTERBUS I/O devices to the PROFINET controller(s) (e.g. ILC 390 PN 2TX-IB). There, the data is processed in accordance with the non-safe application program for output data and is transferred back to the proxy. The proxy with a safe control system then forwards this output data to the outputs of the non-safe INTERBUS I/O devices where it is output.
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