Issue
Explain the digital input characteristics of the PM3255 meter.
Product Line
PowerLogic™ PM3255 Series Meter.
Environment
Energy monitoring systems requiring digital input functionality for control, metering, and event-based operations.
Resolution
The PM3255 meter supports 2 digital inputs, designated as DI1 and DI2, with four configurable operating modes:
Digital Input Operating Modes
-
Normal Input Status
- Used for simple ON/OFF digital inputs.
- Can monitor OF (Open Fault) or SD (Switch Disconnected) signals from circuit breakers.
-
Multi-Tariff Control
- Tariff control can be managed via communications, internal clock, or 1–2 tariff inputs.
- Applying specific ON/OFF signal combinations to the inputs allows the meter to register energy under different tariff registers.
-
Input Metering
- Used for WAGES (Water, Air, Gas, Electricity, Steam) applications.
- Configure pulse frequency (pulse/unit) to count pulses and calculate units.
- Note: Pulse width or stop duration less than 10 ms is invalid for counting.
-
Energy Reset
- Resets partial energy, energy by tariff, and energy by phase.
- Activated by an ON signal lasting more than 10 ms.
