appear “frozen” at the value selected by the user, even if the IED isswitched 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 theI/O card in question. See example of LHMI menu in figure 41IEC15000020 V1 EN-USFigure 41: Example of LHMI menu using BIM3The signal “freezes” and will not change value even if, for example, a binary inputsignal voltage changes level, or if a binary output is activated as the result of aprotection function block activating.12.8.3.2 Forcing by using PCM600 GUID-E9D0DAE6-7A86-4FF9-943E-42039015D05B v1In PCM600 the concept is a bit different compared to LHMI. The forcing isaccomplished by entering a forcing session. Within such a session, multiple signalson multiple I/O boards may be edited and changed at the same time and has noeffect on the IED. Once the user is satisfied with the forcing setup, then all thechanges can be effectuated simultaneously towards the IED, potentially changinginputs and outputs on multiple I/O boards at the same time. It is also possible toabort this operation (described in step 6 below) and to undo all forcing.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 502 073-UEN A Section 12Testing IED operationGenerator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062 125Commissioning manual
