Ceiec Electric Technology
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Chapter 4 Applications
4.1 Inputs and Outputs
4.1.1 Digital Inputs
The PMC-53 optionally provides two self-excited Digital Inputs that are internally wetted at 24 VDC.
Digital Inputs 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 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. Further, the PMC-53
Digital Input provides setpoint capability which can trigger output action when its status changes.
Please refer to Section 4.3.2 for a complete description of the Digital Input Setpoints.
4.1.2 Digital Outputs
The PMC-53 optionally provides two Digital Outputs. They can be of either electromechanical or
solid state type. Digital Outputs are normally used for setpoint alarming, load control, or remote
control applications.
Digital Outputs on the PMC-53 can be used in the following applications:
1) Front Panel Control: Manually operated from the front panel. Please refer to the DO
CTRL setup parameter in Section 3.4.4 for a detailed description.
2) Remote Control: Remotely operated over communications via our free PMC Setup
software or the PecStar® Integrated Energy Management System.
3) Control Setpoint: Control Setpoints can be programmed to trigger DO action upon
becoming active. Please refer to Section 4.3.1 for a detailed
description.
4) Digital Input Setpoint: Digital Inputs can be programmed to trigger DO action upon
becoming active. Please refer to Section 4.3.2 for a detailed
description.
5) I residual Setpoint: If the PMC-53 is equipped with the optional I residual Input, the I
residual ALARM and TRIP setpoints can be enabled to provide
residual current monitoring and trigger DO actions in response to
the I residual setpoints becoming active. Please refer to Section
4.3.3 for a detailed description.
6) Temperature Setpoint: If the PMC-53 is equipped with the optional Temperature input,
the Temperature ALARM setpoint can be enabled to provide
temperature monitoring and trigger DO action in response to the
temperature setpoint becoming active. Please refer to Section
4.3.4 for a detailed description.
Since there are so many ways to utilize the Digital Outputs on the PMC-53, a prioritized scheme
has been developed to avoid conflicts between different applications. In general, Front Panel
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