Digital inputs (PM3255)

The digital inputs have 4 operating modes:

• Normal input status: Use for simple ON/OFF digital inputs. The digital inputs can be OF or SD signals of a circuit breaker.

• Multi-tariff control: You can control the tariff either through communications, the internal clock or by 1 or 2 tariff inputs. Tariff control through the tariff inputs is performed by applying a proper combination of ON or OFF signal to the inputs. Each combination of ON or OFF signal results in the meter registering the energy in a particular tariff register. Refer to the following table for input coding.

• Input metering: You can configure the meter in input metering modes to collect the pulses for WAGES application. To activate this function, set the input metering pulse frequency (pulse/unit). The meter counts the number of pulses and calculates the number of units. Pulse width or pulse stop less than 10 ms is invalid for pulse counting.

• Energy reset: Energy reset function resets partial energy, energy by tariff, and energy by phase. Reset is activated by an ON signal lasting for over 10 ms.

The following table describes the input coding in binary format: