9.8 Forcing of binary input/output signals for testing9.8.1 Forcing concept GUID-3FD8C676-10E5-432A-8CD5-4643299AD794 v2Forcing of binary inputs and outputs is a convenient way to test wiring insubstations as well as testing configuration logic in the IEDs. Basically it meansthat all binary inputs and outputs on the IED I/O modules (BOM, BIM, IOM &SOM) can be set to a value (i.e active or not-active), selected by the user, while theIED is in test mode. For inputs, this is true regardless of the actual signal voltagepresent on the input. For outputs, any output relay can be forced to be active or not,regardless of the current requested state of the output in the IED logicconfiguration.Be observant that forcing of binary inputs and outputs on an IED,with inappropriate setup, can result in potential danger.9.8.2 How to enable forcing GUID-50280F59-A98C-4E48-AB6D-2B4C138943DD v2To enable forcing, the IED must first be put into IED test mode. While the IED isnot in test mode, the LHMI/PCM600 menus that relate to forcing will not have anyeffect on the input/output status due to safety reasons.9.8.2.1 Enable forcing by using LHMI GUID-41F7C636-75BC-42EF-A955-4BD9E347619E v21. Enable IED TESTMODE by setting IEDTestMode to On under Main menu/Test/IED test mode/TESTMODE:1.IEC15000029 V1 EN-US2. Exit back to the root menu.3. Select Yes in the save dialogue box.Once the IED is in test mode the yellow Start LED starts to blink.1MRK 506 377-UEN C Section 9Testing IED operationRailway application RER670 2.2 IEC 67Commissioning manual
