GFK-3030
December 2017
41
Chapter 5
Diagnostics
The GLM Switches support one alarm per port, plus an independent alarm for each power input circuit (PWR1
and PWR2), and an Alarm Status bit that tracks the state of the ALM relay. There are also status bits relating to
MRP set-up.
Each of the port alarms (i.e. Slot 3 Settings) may be enabled and disabled, as listed in Section 4.3.3. These
alarms may be enabled/disabled by PME setup. The PLC logic may also dynamically enable and disable these
alarms by manipulating the corresponding %Q reference bit.
For details on bit locations and senses, refer to:
•
Section 4.3.1 for Slot 1: Device Status
•
Section 4.3.2 for Slot 2: Port Status
•
Section 4.3.3 for Slot 3: Port Alarm & Port Settings & Status
•
Section 4.3.4 for Slot 4: MRP Group 1 Status
•
Section 4.3.5 for Slot 5: MRP Group 2 Status
•
Section 4.3.6 for Slot 6: Ring Group 1 Status
•
Section 4.3.7 for Slot 7: MRE Group 1 Status
•
Section 4.3.8 for Slot 8: MRE Group 2 Status
All input status bits listed in the above sections may be tested by logic in the PLC CPU.
In addition, there is an Alarm Contact (Normally Open) (Figure 11) which may be wired to an external device.
The alarm contacts (marked ALM) are located in the middle of the 6-pin terminal strip on the bottom panel.
The Alarm relay closes whenever any of the enabled alarms becomes active. Refer also to Section 4.3.1
for the corresponding Alarm Status bit.
The state of the Alarm Relay is indicated on the ALM LED, as documented in Section 3.6,
Summary of Contents for GLM064
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