The IED blocked mode and the IED test and blocked mode can be activated by using the WHMI via the front port. The green Ready LED flashes to indicate that the IED test and blocked mode is activated. By default, the test mode can only be changed from the WHMI via the front port. Activation by remote client is possible, see the technical manual.
Note: The Ready LED also flashes if the merging unit detects a diagnostic failure. Check the test mode setting and the merging unit's IRF alarm contact status to find the reason of the failure.
The test mode can be used for simulated testing of functions and outputs without providing current inputs. The IED blocked mode can be used to block the physical outputs to the process.
Note: If the IED blocked or IED test and blocked mode is not cancelled, it remains on and the Ready LED remains flashing.