Allen-Bradley 1771-CFMK Flowmeter Module for PLC-5 Systems

Product Overview

The Allen-Bradley 1771-CFMK is a configurable flowmeter module from the PLC-5 series, designed for high-speed totalizing and rate calculation in demanding industrial environments. It interfaces with magnetic pickup flowmeters, 4 to 40 Volts DC pulse and proximity probes, making it a versatile choice for flow and turbine metering applications.

Technical Specifications Breakdown

Key parameters for the 1771-CFMK are listed below for quick reference:

Industry Applications

In flow and turbine metering, its ability to accept magnetic pickup inputs at 50 millivolts and 200 Volts AC, plus 4 to 40 Volts DC pulses with open collector (TTL compatible), ensures reliable data collection. The four outputs, with a maximum on-state voltage drop of 0.6 Ohms times the current and less than 300 microamps leakage at 40 Volts DC, provide precise control signals for actuators or alarms.

Installation & Setup Guidance

Install the 1771-CFMK into any single slot of a compatible Allen-Bradley chassis. Ensure the backplane current draw does not exceed 1 Amp. Configure each of the four channels for flowmeter or gate input as needed. The module supports magnetic pickup, pulse, and proximity probe inputs, including compatibility with Bently Nevada 3300 transducer systems. Use block-transfer programming in your PLC to read rate and total values.

Maintenance & Reliability

Operate the module within 0 to 60 degrees Celsius to maintain peak performance. Monitor thermal dissipation; the module ranges from 6.8 BTU per hour (minimum) to 54.2 BTU per hour (peak). Keep the chassis ventilation clear and inspect connections periodically. The module's solid-state design minimizes wear, but environmental dust or moisture should be avoided.

Compatibility & Integration

The 1771-CFMK is compatible with Allen-Bradley PLC-2, PLC-3, PLC-5, and PLC-5/250 processors. It can operate as a CFM module, or as a replacement for QRC or QRD modules. The four input channels accept magnetic pickup, 4 to 40 Volts DC pulses, and proximity probes compatible with Bently Nevada 3300 systems. This flexibility simplifies upgrades in existing installations.

Selection Guide & Purchasing Advice

When selecting the 1771-CFMK, verify your processor compatibility and required input types. AutoDCSTech offers this module with detailed support. Please verify current lifecycle status and availability with AutoDCSTech before ordering.