Simultaneity And Tolerance Time Of The Two Monitoring Channels - Siemens SINAMICS Series Function Manual

5.3 Control of "STO" and "SS1" via terminals on the Control Unit and the Motor/Power Module
5.3.1

Simultaneity and tolerance time of the two monitoring channels

The "Safe Torque Off" function must be selected/deselected simultaneously in both
monitoring channels using the input terminals and is only effective for the associated drive.
● 1 signal: Deselecting the function
● 0 signal: Selecting the function
The time delay that is unavoidable due to mechanical switching operations, for example, can
be adapted via parameters. The tolerance time, within which selection/deselection in the two
monitoring channels must occur if they are to be considered "simultaneous," is set in the
following parameters:
● p9650 (Basic Functions)
● p10002 (Extended Functions)
Note
Parameterization of the tolerance time
In order to avoid that faults are incorrectly initiated, at these inputs the tolerance time must
always be set shorter than the shortest time between two switching events (ON/OFF,
OFF/ON).
● If the monitoring functions are not selected/deselected within the tolerance time, this is
detected by the cross-check, and the following fault (STOP F) is output.
– F01611 (Basic Functions)
– C01770 (Extended Functions)
For STO the following applies: In this case, the pulses have already been canceled as a
result of the selection of "Safe Torque Off" on one channel.
Note
Timing between the switching operations for Basic Functions
Message F01611 with fault value 1000 is output if switching operations occur too
frequently. The cause depends on the type of control:
• The signals are continually changing at the F-DI.
• STO is being permanently initiated via PROFIsafe (also as subsequent response).
Within the time 5 × p9650, there must be at least two switching operations at the
terminals or via PROFIsafe with a minimum time between them of p9650.
Safety Integrated
Function Manual, 07/2016, A5E03264275A
Controlling the safety functions
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