CET PMC-53A User Manual

CET Electric Technology
36
Chapter 4 Applications
4.1 Inputs and Outputs
4.1.1 Digital Inputs
The PMC-53A comes optionally with four or six self-excited Digital Inputs that are internally wetted at
24 VDC with a sampling frequency of 1000Hz and programmable debounce. The PMC-53A provides the
following programmable functions for its digital inputs:
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 3 Digital Inputs may be used to select to which of the 8 Tariffs
the energy consumption should be accumulated. The 3 Digital
Inputs (DI1, DI2 and DI3) represent 3 binary digits where Tariff
1=000, Tariff 2=001, …, Tariff 8=111 where DI1 represents the least
significant digit and DI3 represents the most significant digit. 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 V1.00.03 or later.
The following table describes the DI’s setup parameters:
Setup Parameter
Definition
Options
DIx Function
Each DI can be configured as a Digital Input or Pulse Counter.
Only DI1 to DI3 can be set as Tariff Switch.
0=Digital 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 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 Digital Outputs
The PMC-53A comes optionally with two or four Form A Electrometrical Relays or Solid State Relays.
Digital Outputs are normally used for setpoint alarming, load control, or remote control applications.
Digital Outputs on the PMC-53A can be used in the following applications:

CET PMC-53A Specifications

General

Brand	CET
Model	PMC-53A
Category	Measuring Instruments
Language	English