QUESTION:

How does one connect two AS-Interface bus systems in which Safety at Work is used?

ANSWER:

You will find a sketch of the principle attached which shows you how you can connect two AS-Interface bus systems in which Safety at Work is used.

For the coupling of category 4 secure signals, an additional monitor and a secure module are needed per AS-Interface bus.

The monitors which are used for coupling (1.1 and 2.1) should be programmed with automatic start.
The monitors which can be used for switching-off (1.2 and 2.2) can be programmed with each of the start blocks, according to request.

With teaching, the coupling monitors must first be taught and enabled.

If only one channel is needed for switching off, then the second channel can also use the function of the second monitor.

With teaching, all secure modules must have closed contacts.

This can only be done by implementing with 2 monitors when both K45F are bridged (e.g. with an input jumper).

You will find an example program attached of what the realization could look like.
 

44234_e.zip ( 20 KB )