ABB Relion 670 Series Commissioning Manual page 68

Section 9
Testing IED operation
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
62
IEC15000021 V1 EN-US
Figure 11: 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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Railway application RER670
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Commissioning manual