CET PMC-340 User Manual

CET Inc.
23
Chapter 4 Applications
4.1 Inputs and Outputs
4.1.1 Digital Inputs (PMC-340B Only)
The PMC-340B comes standard with three self-excited Digital Inputs that are internally wetted at 24
VDC. Digital Inputs on the PMC-340B can be used in the following applications:
1) Digital Input The digital inputs are typically used for status monitoring which can help
prevent equipment damage, improve maintenance, and track security
breaches. The real-time statuses of the Digital Inputs are available on the
front panel LCD Display as well as through communications. Changes in
Digital Input status are stored as events in the SOE Log in 1 ms resolution.
2) Pulse Counting Pulse counting is supported with programmable pulse weight and facilitates
WAGES (Water, Air, Gas, Electricity and Steam) information collection.
3) Tariff Switching Up to 2 Digital Inputs may be used to select to which of the 4 Tariffs the
energy consumption should be accumulated. The 2 Digital Inputs (DI1 and
DI2) represent 2 binary digits where Tariff 1=00, Tariff 2=01, Tariff 3= 10 and
Tariff 4=11 where the least significant digit represents DI1 and the most
significant digit represents DI2. The DI1 Function setup register must first
be programmed as a Tariff Switch before configuring DI2 with the same
function. In other words, if DI1 is configured as a Digital Input or Energy
Pulse Counter and DI2 is configured as a Tariff Switch, the TOU will continue
to function based on the TOU Schedule. This feature is available in
Firmware V1.00.01. Tariff switching as a result of DI changes will be stored
as an event in the SOE Log.
The following table describes the DI setup parameters that can be programmed over communications:
Setup Parameter
Definition
Options
DIx Function
Each DI can be configured as a Status Input or Pulse Counter.
Only DI1 and DI 2 can be set to Tariff Switch.
0=Status Input*
1=Pulse Counter
2=Tariff Switch
DIx Debounce
Specifies the minimum duration the DI must remain in the
Active or Inactive state before a DI state change is considered
to be valid.
1 to 1000 (ms)
(Default=20ms)
DIx Pulse Weight
Specifies the incremental value for each received pulse. This
is only used when a DI is configured as a Pulse Counter.
1* to 1,000,000
*Default
Table 4-1 DI Setup Parameters
4.1.2 Energy Pulse Output
The PMC-340 comes standard with one front panel LED Pulse Output and one Solid State Relay Output
for energy pulsing. Energy Pulse Output is typically used for accuracy testing. Energy Pulsing can
be enabled from the front panel through the Energy Pulse setup parameter. The pulse constant can
be configured through the Pulse Constant setup parameter as 1/10/100 pulses per kXh for the 100A
Direct Input option and 1000/3200 pulses per kXh for the 5A CT Input option, respectively, where kXh
may be kWh or kvarh.

CET PMC-340 Specifications

General

Brand	CET
Model	PMC-340
Category	Measuring Instruments
Language	English