Siemens SINUMERIK 840Di Function Manual page 1338

Detailed Description
2.12 Block descriptions
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. Parameter FirstRun must be switched to
the value TRUE via a retentive data (memory bit, bit in data block) on the first run after
control booting. The 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 separate instance.
The corresponding NCK SPL block is described in:
References:
/FBSI/ Description of Functions, Safety Integrated.
Simplified block diagram in CSF
The figure below shows only one acknowledgment input Ack1 and one delayed deactivation
output Out1. The circuit for Ack2 and the other delayed outputs are identical. The parameter
FirstRun is also missing in the function diagram. The mode of operation is described above.
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PLC Basic Program Solution Line (P3 sl)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0