Modbus register reading 32768 or -32768

Issue
Modbus register returns value of 32768 or -32768 when using modbus tester to read holding registers

Product Line
PowerLogic Meters
Micrologic Trip Units

Environment
ION Setup
Tester
Modbus Register Readings

Cause
There are two situations that will cause a register in a PowerLogic Circuit Monitor, Power Meter, or other PowerLogic device to contain a value of -32768.

1. When there is no input (voltage or current) to calculate or measure a metered value.
2. When the register value is non-applicable for the mode of the meter.
3. When you are reading the wrong unit ID of an Ethernet device, i.e., unit ID 1 instead of 255 on a PM5560

Example: The frequency register in a CM4250 will read -32768 when no voltage or current is present.

Note: System Manager Software (SMS) will indicate N/A when a register value contains the value -32768 and Power Monitoring Expert (PME) 8.1 will show 0.

Resolution
In many cases a power cycle to the meter or micrologic trip unit will resolve this issue.
If a power cycle does not resolve this issue, please contact your local Schneider Technical support representatives for further troubleshooting or RMA

Released for: Schneider Electric Canada