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).
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
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 of
f 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
22
1MRK 505 378-UEN A Section 10
Testing IED operation
Line differential protection RED670 2.2 IEC 97
Commissioning manual
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