P3: Basic PLC Program for SINUMERIK 840D sl
13.13 Block descriptions
Basic Functions
986 Function Manual, 09/2011, 6FC5397-0BP40-2BA0
13.13.8 FB 10: Safety relay (SI relay)
Function
The SPL block "Safety relay" for "Safety Integrated" is the PLC equivalent of the NC function of the same name.
The standard SPL "Safety relay" block is designed to support the implementation of an emergency stop function
with safe programmable logic. However, it can also be used to implement other similar safety functions, e.g.,
control of a protective door. The function contains 3 input parameters (In1, In2, In3). On switchover of one of
these parameters to the value 0, the output Out0 is deactivated without delay and outputs Out1, Out2 and Out3
deactivated via the parameterized timer values (parameters TimeValue1, TimeValue2, TimeValue3). The outputs
are activated again without delay, if inputs In1 to In3 take the value 1 and a positive edge change is detected at
one of the acknowledgement inputs Ack1, Ack2. To bring the outputs to their basic setting (values = 0) after
booting, the parameter "FirstRun" must be configured as follows. The parameter "FirstRun" must be switched to
the value TRUE via a retentive data (memory bit, bit in data block) on the 1st run after control booting. This data
can be preset, e.g., in OB 100. The parameter is reset to FALSE when FB 10 is executed for the first time.
Separate data must be used for parameter "FirstRun" for each call with its own instance.
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