Operating Digital Inputs - Satec Expertmeter EM720 Operation Manual

Chapter 2 Operating the EM720

Operating Digital Inputs

EM720 Power Quality and Revenue Meter
The EM720 can monitor a total of 8 digital inputs including
four fast internal digital inputs and up to 2 replaceable
two-channel
Installation Manual for digital input ratings.
The module is provided with four indication LEDs that
show the status of the digital inputs and relay outputs:
LED Color
IN1, IN2 Yellow
OUT1, OUT2 Green
Fast internal digital inputs are sampled at a 1-ms rate,
and expansion inputs are sampled at a 1/2-cycle rate.
Digital inputs functionality is programmable in the EM720
and any digital input can perform multiple metering and
control functions at the same time:
• Receiving energy pulses from external watt meters
(sub metering) – link a digital input to a Billing/TOU
register and provide a required multiplication factor
(see Configuring Billing/Tariff Registers
5)
• Counting pulses from external pulse sources – link a
digital input to a pulse counter (see
in Chapter 5)
• Triggering a setpoint – put a digital input into a
setpoint trigger list (see
Chapter 5)
• Triggering the Fault Recorder – link a digital input
to the Fault Recorder (see
in Chapter 5) and enable external triggers in the
2DI/2DO modules.
Status
Lights The digital input terminals are shorted
Lights The normally open relay contacts are closed
Using Control Setpoints
Configuring Digital Inputs
Operating Digital Inputs
See the EM720
Description
in Chapter
Using Counters
in
21