Forcing Of Binary I/O Signals For Testing; Forcing Concept; How To Enable Forcing; Enable Forcing By Using Lhmi - ABB rec670 Commissioning Manual

1MRK 511 360-UEN A
9.8
9.8.1
9.8.2
9.8.2.1
Bay control REC670 2.1 IEC
Commissioning manual

Forcing of binary I/O signals for testing

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.

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.

Enable forcing by using LHMI

1. Enable IED Testmode by setting IEDTestMode to On under Main menu/
Test/IED test mode TESTMODE:1.
IEC15000029 V1 EN
2. 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.
Section 9
Testing IED operation
75