Forced Checking Procedure (Test Stop) Of The Tm54F - Siemens SINAMICS S120 Function Manual

6.10.2

Forced checking procedure (test stop) of the TM54F

Testing failsafe inputs and outputs
Failsafe inputs and outputs must be tested for fail-safety at defined time intervals (forced
checking procedure (test stop)). The TM54F contains a function block that runs this forced
checking procedure (test stop) in the following cases:
● When selected via a BICO source
● Automatically, each time the power supply voltage is switched on (POWER ON)
To monitor the time until the next required test, a timer (p10003) is started after every error-
free forced checking procedure (test stop). The message A35014 "TM54F test stop
necessary" is set on expiration of the monitored time and each time the Control Unit is
switched on.
The failsafe digital inputs can be selected for the forced checking procedure (test stop) 3
modes can be selected for testing the output (see following chapter).
When the appropriate safety devices are implemented (e.g. protective doors), it can be
assumed that running machinery will not pose any risk to personnel. The user is therefore
only informed that the forced checking procedure (test stop) is due in the form of an alarm,
which requests the user to perform forced checking procedure (test stop) at the next possible
opportunity.
Examples of when the forced checking procedure (test stop) must be performed:
● When the drives are at a standstill after the system has been switched on
● Before opening the protective door
● At defined intervals (e.g. every 8 hours)
● In the automatic mode, time and event-dependent
● Automatically, each time the power supply voltage is switched on (POWER ON)
Execution
When parameterizing, proceed as follows:
1. Derive the suitable mode from the circuit used in your application (see figures in the
following chapters).
2. Use parameter p10047 to set the mode that is to be used.
3. Use parameter p10046 to define which digital outputs (F-DO 0 to F-DO 3) are to be
tested. Note the following:
Digital outputs that are not tested are shut down during the forced checking procedure
(test stop).
Safety Integrated
Function Manual, 12/2018, 6SL3097-5AR00-0BP1
Commissioning
6.10 Commissioning TM54F
313