PROFIsafe 199
Remote I/O control
You can control the FSO module outputs and read input information also from the
safety PLC. A request to activate or deactivate an output is sent from the safety PLC
(PROFIsafe controller) to the FSO module in a PROFIsafe message. See section
FSO PROFIsafe profiles on page 201.
Only FSO outputs that are not configured for any control use (for example, to control
an indication lamp or a brake) can be activated from the safety PLC. If the safety PLC
tries to activate an FSO output that is configured for control use, the FSO module
rejects the request, activates the SSE function and goes into the Fail-safe mode (see
section FSO module modes and states on page 212). To exit the Fail-safe mode,
reboot the FSO as described in Internal fault on page 505.
FSO module passivation
If the FSO module or the safety PLC detects an error in the fieldbus communication,
the FSO module is passivated. The status of the FSO outputs that are not configured
for any control use (for example, to control an indication lamp or a brake) are set to
“low”. The FSO module activates the SSE function, goes into the Safe state and
generates an event. The user can select the event type (warning, fault or event) with
parameter SBUSGEN.10 STO indication passivation.
After the cause of the passivation has been detected, the SSE function must be
acknowledged before the communication continues. The status of the safety
functions and FSO outputs are set according to the PROFIsafe message that was
received before the passivation.
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