Schneider Electric 4000 DIGITAL INPUTS

63230-300-212 Chapter5—Input/Output C apabilities

April 2001 Digital Inputs

The circuit monitorcan accept up to 16 digital inputs depending on the I/O

accessories youselect. Digital inputs are used to detect digital signals. For

example,the digital input can be used to determine circuit breaker status,

countpulses, or count motor starts. Digital inputscan also be associated with

anexternal relay, which can triggera waveform capture in the circuit monitor.

Youcan log digitalinput transitions as eventsin the circuit monitor’s on-board

alarm Log. The eventis date and time stamped with resolution to the

millisecond,for sequence of events recording. Thecircuit monitor counts

OFF-to-ONtransitions for each input, and you can resetthis value using the

command interface.

Digital inputshave four operating modes:

•Normal—Usethe normal mode for simple on/offdigital inputs. In normal

mode, digital inputscan be used to count KYZ pulses for demand and

energycalculation. Using the input pulse demand feature, you can map

multiple inputsto the same channel where the circuit monitor can total

pulses from multipleinputs (see“Input Pulse Demand Metering”on page

62 in Chapter 4—Metering Capabilitie s formore information). To

accuratelycount pulses, set the time between transitionsfrom OFF to ON

and ON to OFF to at least 20 milliseconds.

•Demand Interval SynchPulse—you can configure any digital input to

accepta demand synch pulse from a utility demand meter (see “Demand

Synch Pulse Input”onpage 72 of this chapter for more about this topic).

For eachdemand profile, you can designate only one inputas a demand

synch input.

•Time Synch—youcan configure one digital input toreceive a signal from

a GPS receiverthat provides a serial pulse stream in accordance to the

DCF-77 formatto synchronize the internal clock of the circuit monitor.

•Conditional EnergyControl—you can configure one digital input to

controlconditional energy (see “EnergyReadings”on page 64 in Chapter

4—Metering Capabilitiesfor more about conditional energy).

Toset up a digital input on the I/O extender,you must first define it from the

display.From the main menu, select Setup > I/O.Select the appropriate

digital inputoption. For example, if youar eusing IOX-2411 option of the I/O

Extender,select IOX-2411.For detailed instructions,see “Settin g Up I/Os”on

page 23 in Chapter 3—Operation. Thenusing SMS, define the name and

operatingm odeof the digital input. The name is a 16-character label that

identifiesthe digital input. The operating mode is one of those listed above.

See the SMS online help forinstructions on device set up of the circuit

monitor.

DIGITAL INPUTS