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Section 10
Testing IED operation
Freezing a signal value without changing it
•
Set the status of a signal to Forced, in the forcing menu that corresponds to the I/O card in question.
See example of LHMI menu in figure
IEC15000020 V1 EN-US
Figure 22:
The signal "freezes" and will not change value even if, for example, a binary input signal voltage changes
level, or if a binary output is activated as the result of a protection function block activating.
10.8.3.2
Forcing by using PCM600
In PCM600 the concept is a bit different compared to LHMI.The forcing is accomplished by entering a
forcing session. Within such a session, multiple signals on multiple I/O boards may be edited and
changed at the same time and has no effect on the IED. Once the user is satisfied with the forcing setup,
then all the changes can be effectuated simultaneously towards the IED, potentially changing inputs and
outputs on multiple I/O boards at the same time. It is also possible to abort this operation (described in
step 6 below) and to
1.
Right click on the IED in the plant structure and select Signal Monitoring.
2.
Click on the List View tab.
3.
Click Forcing Session in the menu IED/Start Forcing.
IEC15000023 V1 EN-US
4.
Click Start editing signal value for forcing on the tool bar.
76
It is possible to power-cycle the IED in this state without losing the forcing states and
values. This means that once a signal is forced, and the IED remains in IED test mode,
the input or output will appear "frozen" at the value selected by the user, even if the IED
is switched off and back on again.
Example of LHMI menu using BIM3
undo all
forcing.
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22
1MRK 511 409-UUS Rev. K
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Phasor measurement unit RES670
Commissioning manual
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