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CET Electric Technology
Chapter 4 Applications
4.1 Inputs and Outputs
4.1.1 Digital Inputs
The PMC-592 provides two or optionally four self-excited
Digital Inputs
(
DIs
) that are internally wetted
at 24 VDC. DIs are typically used for monitoring external status which can help prevent equipment
damage, improve maintenance, and track security breaches. The real-time statuses of the DIs are
available on the Web Interface, HMI as well as through communications. Changes in DI status are stored
as events in the SOE Log in 1 ms resolution. Each
DI
has the following setup parameters:
Setup Parameter
Definition
Options/Default*
DIx Mode
The
DI
can ONLY be configured as a Status Input.
0 = Status Input*
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 9999 (ms)
20ms*
Table 4-1 Definition for DI Parameters
In addition, the PMC-592 can be configured for monitoring the breaker status for each Branch Circuit
via the external DI module such as PMC-521D in Firmware V1.00.03 or later. Up to 4 DI Modules (or
PMC-521D) may be connected where each PMC-521D can be used for monitoring 21 breaker status of
each Branch Input. The breaker status is read by the PMC-592 over RS485 (P2) when the
P2
Operation
Mode
is set to
External DI Module
. Each DI Module has the following setup parameters which can be
programed via the Web interface, HMI or through communication:
Setup Parameter
Definition
Options/Default*
External DI Module Number
Specifies how many DI Modules (PMC-521D) are connected.
0* to 4
DI Module #x ID
Specifies the Unit ID for each DI Module.
1 to 247, 100*
DI Module #x 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 9999 (ms)
20ms*
DI Module #x External Source
Specifies whether Excitation Source of the DI Module is DC or AC.
0=DC*, 1=AC
Table 4-2 Definition for DI Module Parameters
The following figures illustrate how to program a particular DI or DI Module for Status monitoring via
the Web or HMI.
Figure 4-1 Programming the On-Board DI or External DI Modules via the Web Interface