PLCs, Power Supplies & Others

This module conditions analog signals from thermocouples, RTDs, and strain gauges. It provides linearized, scaled outputs for direct connection to control system inputs. Engineers use this unit to bridge sensor signals with analog input modules seamlessly. The design offers multiple configuration options through onboard jumpers and DIP switches. Its compact size fits standard backplane slots while delivering precise signal conditioning.

Input Signal Types and Ranges

The 45C97 accepts J, K, T, and E type thermocouple inputs with built-in cold-junction compensation. It also supports 2-wire and 3-wire RTD configurations for platinum or nickel elements. For process signals, the module handles 0-10V, 0-20mA, and 4-20mA current loops. Each input channel features individual configuration for maximum application flexibility. Users can mix different sensor types across channels without external adapters.

Output Specifications and Scaling

Each conditioned channel produces a standardized 0-10V or 4-20mA output signal. The module provides programmable gain and offset adjustments for fine-tuning. Output accuracy reaches ±0.1% of full scale at reference temperature conditions. The scaling circuitry maintains linearity within ±0.05% across the entire operating range. This precision ensures accurate representation of physical measurements in the control system.

Physical Dimensions and Mounting

The 45C97 measures 12.7 cm in width, 25.4 cm in height, and 20.3 cm in depth. It weighs approximately 1.0 kg, which ensures stable placement within the rack. A steel housing with vented panels provides effective heat dissipation. The unit installs directly into standard 19-inch rack chassis or PLC backplanes. Its front panel contains all configuration switches and status indicators for easy access.

Connector Interfaces and Field Wiring

A 25-pin D-sub connector handles all input and output terminations on the front face. This connector accepts wire gauges from 0.2 mm² to 1.5 mm² for secure connections. Individual terminal blocks provide convenient access for each channel’s wiring. The module includes dedicated shield terminals for grounding cable braids properly. Moreover, strain relief clamps protect terminations from vibration-induced damage.

Internal Components and Energy Storage

The printed circuit board contains one 16-bit ADC, two operational amplifiers, and eight precision resistors. A 10 µF tantalum capacitor provides filtering for the reference voltage circuit. The module also includes 12 surface-mount resistors for input scaling networks. No battery or non-volatile memory exists on this purely analog assembly. The passive design ensures long-term reliability and zero configuration loss during power cycles.

Power Requirements and Isolation

The 45C97 draws 250 mA from the 5 VDC backplane under full operational load. It also requires 100 mA from an external 24 VDC supply for sensor excitation. Channel-to-channel isolation provides 500 VDC separation for preventing ground loops. The module includes transient protection on each input for surge immunity. These features protect the control system from field wiring faults and noise.

Status Indication and Diagnostic Functions

Two front-panel LEDs indicate module power and overall operational status. A green LED confirms proper power supply while a red LED signals input overrange conditions. The module provides a fault relay output for external alarm annunciation. This relay activates when any channel exceeds its configured input range. Maintenance personnel can quickly identify faulty sensors without complex troubleshooting procedures.

Environmental Specifications and Compliance

The 45C97 operates reliably across temperatures from 0°C to 60°C. It withstands humidity levels up to 95% non-condensing without performance degradation. The module complies with IEC 61000-4-2 for electrostatic discharge immunity. Vibration tolerance meets IEC 60068-2-6 requirements for industrial environments. This robust construction suits applications in chemical processing, power generation, and manufacturing.

Technical Data Sheet – Reliance Electric 45C97

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