HIMatrix 8 Safety-related Aspects of the User Program
HI 800 023 E Rev. 1.01 Page 57 of 72
- The entered force values are kept, but are not effective.
Set:
- Forcing is allowed
- The entered force values only become effective if the corresponding force switch has
also been set for the data source.
Forcing is terminated and the process value reactivated upon expiration of the force time or
when forcing is intentionally stopped.
NOTE
Physical injury due to forced signals is possible!
Only set the Forcing Allowed switch after receiving consent from the test authority
responsible for the final system acceptance test.
Provided that Stop at Force Timeout is activated in the resource's properties (see also
message in the info field), the controller enters the STOP state after the force time has
expired and the user program continues to run with the process values.
If Stop at Force Timeout is not set, the controller is not stopped after the force time has
expired. Forcing is deactivated and the values previously forced (R force values) are
replaced with their process values.
This may have unintentional effects on the overall system.
To manually stop forcing, click the Stop button in the Force Editor. By doing so, the
controller maintains the RUN state since the timeout has not been attained and the Stop at
Force Timeout reaction was not defined.
When forcing values, the person in charge must take further technical and organizational
measures to ensure that the process is sufficiently monitored in terms of safety.
Forcing can be time-limited. If the Force Time is overrun, the user can define if the CPU
should enter the STOP state or the force value should no longer be valid such that normal
operation can be continued. In any case, overrunning the force time affects the user
program and thus the process.
The force value is stored in the processor system. If the processor system switches from
RUN to STOP, the forcing procedure is deactivated to ensure that the controller does not
accidentally start with active force signals.
Forcing Using Force Markers
Force markers are an additional option to force signals, e.g., for finding faults. Force
markers are function blocks that can be used in the user program to force individual
signals. Refer to the ELOP II Factory online help for more details.
NOTE
Physical injury due to forced signals is possible!
Remove all force markers from the user program prior to starting safety-related
operation or before an acceptance test is performed by a test institute!
8.2.12 Online Test
The Online Test function allows the user to display online test fields (OLT fields) in the logic
and to set variables while the controller is operating.
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