ABB Relion 670 Series Commissioning Manual page 93

1MRK 511 403-UEN E
3.
When navigating away from a LHMI forcing menu for an I/O board, the user is prompted to
either leave the signals forced, or to revert all of them back to the unforced state.
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
Bay control REC670
Commissioning manual
IEC15000021 V1 EN-US
Figure 21: Value line of the desired signal
Use the up/down arrows on the LHMI to change the signal value or the appropriate
menu in PCM600.
The status of the signal changes automatically to Forced (i.e. there is no need to set
the status to Forced manually).
On the LHMI, these edit changes have immediate effect. This means that the
value changes directly when the up/down arrow is pressed (i.e. there is no need
to press the Enter key to effectuate the change).
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.
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Section 10
Testing IED operation
87