appear “frozen” at the value selected by the user, even if the IED is
switched off and back on again.
Freezing a signal value without changing it
GUID-FD76AAC1-7098-47D3-A3A1-6ACDF509ED91 v1
•
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:
Example of LHMI menu using BIM3
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.
9.8.3.2
Forcing by using PCM600
GUID-E9D0DAE6-7A86-4FF9-943E-42039015D05B v1
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
.
1MRK 505 372-UEN A
Section 9
Testing IED operation
Busbar protection REB670 2.2 IEC
77
Commissioning manual
