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
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.
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
13
1MRK 506 355-UEN A Section 9
Testing IED operation
Line distance protection REL670 2.1 IEC 79
Commissioning manual
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