Forcing By Using Pcm600 - ABB Relion 650 Series Commissioning Manual

Section 8
Testing IED operation
IEC15000022 V1 EN-US
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 11:
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.
8.8.3.2

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.
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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
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forcing.
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