PLCs, Power Supplies & Others

Product Overview

This analog input module converts process signals into digital values for Reliance Electric control systems. Industrial applications demand accurate measurements from temperature, pressure, and flow transmitters. The 45C344 provides eight differential input channels with programmable signal ranges. Its 14-bit resolution captures subtle process variations for precise control actions. Automation engineers can configure each channel independently for voltage or current inputs. The module’s high common-mode rejection eliminates noise from long field wiring.

Technical Specifications

Signal Conditioning and Conversion

The 45C344 employs a sigma-delta ADC for each differential input channel. This converter delivers excellent linearity and low quantization noise for precise measurements. The module’s instrumentation amplifiers provide high input impedance for voltage signals. Integrated shunt resistors enable current measurements without external components. Software-selectable digital filters attenuate high-frequency noise effectively.

Flexible Channel Configuration

Users configure each channel independently for voltage or current input operation. The module supports 0–10 V, 0–5 V, ±10 V, 0–20 mA, and 4–20 mA ranges. Scaling coefficients convert raw ADC readings directly into engineering units. The unit stores configuration parameters in non-volatile memory for automatic reloading. Channel-specific filtering addresses varying noise levels from different field devices.

Noise Rejection and Signal Integrity

The module’s differential inputs reject common-mode noise from ground potential differences. Common-mode rejection exceeds 100 dB at 50 and 60 hertz. Built-in surge suppression protects inputs from transient overvoltages. The unit’s layout minimizes crosstalk between adjacent channels. Shielded terminal blocks further enhance noise immunity in electrically noisy environments.

Diagnostic and Status Monitoring

Individual LEDs indicate overrange and underrange conditions for each active channel. A global module status LED confirms power and communication integrity. The unit reports open-circuit detection on 4–20 mA current loop inputs. Diagnostic data includes minimum and maximum captured values for process analysis. Users can initiate a self-test routine through the system software.

Power Consumption and Thermal Management

The module draws a maximum of 5.0 watts from the 24-volt backplane supply. Low internal dissipation ensures stable analog performance across temperature variations. The housing design promotes natural convection for effective cooling. Minimal heat generation permits dense packing of multiple analog modules. The unit’s thermal stability maintains accuracy specifications without warm-up periods.

Mechanical Design and Installation

The 50-millimeter wide housing fits standard Reliance Electric rack systems. Removable terminal blocks accept wire sizes from 0.5 mm² to 2.5 mm². Weighing 420 grams, the module inserts and removes with ease. Guide rails ensure proper alignment with the backplane connector. Clear silk-screening identifies channel numbers and terminal assignments for error-free wiring.

Details