CAREL PC0E004850 EXPANSION MODULE RS485 PCO REV. 2.060 16:30

• BRAND: CAREL
• PCO CAREL
• RS485 EXPANSION BOARD
• MFG DATE: 31-MAY-2018
• SN: C00052987
• REV: 2.060
• CODE:PC0E004850
• MADE IN USA

CAREL PC0E004850 Expansion Module – Product Description

The CAREL PC0E004850 is an RS485 Expansion Module designed for the pCO series of programmable HVAC/R controllers. Its primary function is to expand the I/O (Input/Output) capacity of a master pCO controller, allowing it to interface with more sensors, actuators, and devices than its built-in terminals allow.

The “REV. 2.060” indicates the hardware revision of the module, and “SEO” is likely an internal manufacturing or product code.

Key Features

• Communication Interface: Equipped with an RS485 serial bus. This is a robust, industry-standard communication protocol ideal for building automation systems, allowing for long-distance communication (up to 1200 meters) and connectivity of multiple devices on a single bus.

• Plug-and-Play Expansion: Connects directly to the pCO system’s expansion bus. It is automatically recognized by the master pCO controller (once configured in the software), simplifying system integration.

• Additional I/O Capacity: The module provides a set of configurable digital and analog inputs and outputs. The exact number and type can vary, but a typical configuration for such a module is:

  • Analog Inputs (AI): For reading signals from sensors (e.g., temperature, pressure, humidity sensors using 0-10V, 4-20mA, or NTC/PTC thermistors).

  • Digital Inputs (DI): For reading on/off statuses (e.g., pressure switches, alarm contacts, flow switches).

  • Digital Outputs (DO) or Relays: For controlling devices (e.g., contactors, solenoid valves, alarm indicators). These are often configurable as PWM (Pulse Width Modulation) outputs.

• pCO Ecosystem Integration: Fully integrated with the CAREL pCO environment. All I/O points on this expansion module are treated as native points of the master controller within the pCO+` design and configuration software.

• Compact Design: Designed to fit seamlessly with other pCO modules in a DIN rail enclosure, saving panel space.

Primary Function and Application

The PC0E004850 is used when the I/O capabilities of a central pCO controller (e.g., a pCO5 or pCO3) are insufficient for a given application.

Typical Use Cases:

• HVAC Systems: Adding extra temperature sensors for zoning, pressure sensors for VAV systems, or control outputs for additional valves and dampers.

• Refrigeration Systems: Expanding a controller for a multi-compressor rack to include more pressure transducers, case temperature sensors, or alarm contacts for individual cases.

• Energy Management: Integrating additional power meters or sub-meters into a building management system run by a pCO controller.

Technical Specifications (Generic)

• Power Supply: Typically powered from the pCO system’s main power supply or via the expansion bus.

• Communication Protocol: RS485, following CAREL’s proprietary pCO network protocol or sometimes standard Modbus RTU.

• Isolation: Galvanic isolation between the communication bus and the I/O circuits is common to protect against electrical noise and surges.

• Operating Environment: Standard industrial ratings for temperature and humidity.

Configuration and Programming

• The module itself is not programmed independently.

• It is configured entirely within the pCO+` software suite.

• The system programmer defines the master controller, adds the expansion module to the system layout, and then assigns each physical I/O point on the module a logical function within the application program (e.g., “Condenser Pressure Input,” “Alarm Horn Output”).