10.8 Forcing of binary input/output signals for testing
10.8.1 Forcing concept
Forcing of binary inputs and outputs is a convenient way to test wiring in substations as
well as testing configuration logic in the IEDs. Basically it means that 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 the IED is in test mode. For inputs, this is true
regardless of the actual signal voltage present 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 logic configuration.
Be observant that forcing of binary inputs and outputs on an IED, with
inappropriate setup, can result in potential danger.
10.8.2 How to enable forcing
To enable forcing, the IED must first be put into IED test mode. While the IED is not in
test mode, the LHMI/PCM600 menus that relate to forcing will not have any effect on the
input/output status due to safety reasons.
10.8.2.1 Enable forcing by using LHMI
1. Enable IED TESTMODE by setting IEDTestMode to On under Main menu/
Test/IED test mode/TESTMODE:1.
1MRK 504 165-UUS - Section 10
Testing IED operation
Transformer protection RET670 2.2 ANSI 97
Commissioning manual
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