WESTINGHOUSE 1C31234G01 Mixed Digital IO Module

The Westinghouse 1C31234G01 is the personality module of the Ovation 8-channel RTD input subsystem. It carries the PTD board that conditions the resistance signals from eight Resistance Temperature Detectors and passes them to the matching electronics module, which digitizes the readings for the controller. It supports both 3-wire and 4-wire RTD connections and covers all of the module's configured ranges. The electronics module for this subsystem is 1C31234G01, and the two parts are used as a pair.

Key Specifications

• Manufacturer: Westinghouse Process Control
• Part Number: 1C31234G01
• Product Type: Personality module (PTD board), 8-channel RTD input subsystem
• Number of Channels: 8
• Wiring Modes: 3-wire and 4-wire, selectable per channel
• RTD Types Supported: 10 Ω platinum, 10 Ω copper, 50 Ω copper, 100 Ω platinum, 200 Ω platinum
• Excitation Current: 1.0 mA
• Resolution: 12 bits
• Guaranteed Accuracy (at 25 °C): 0.10 % ± [0.045 (Rcold/Rspan)] % ± [(Rcold + Rspan)/4096 Ω] % ± [0.5 Ω/Rspan] % ± 10 μV ± 1/2 LSB
• Temperature Coefficient: 10 ppm/°C
• Dielectric Isolation: 200 V AC/DC channel to channel; 1000 V AC/DC channel to logic
• Input Impedance: 100 MΩ (50 kΩ in power-down)
• Common Mode Rejection: 120 dB at DC and nominal line frequency ± 0.5 %
• Normal Mode Rejection: 100 dB at DC and nominal line frequency ± 0.5 %
• Sampling Rate: 16.67 s per scan at 50 Hz, 20 s at 60 Hz; lead-resistance measurement every 6.45 s in 3-wire mode temporarily slows the rate to 3 s (50 Hz) or 2 s (60 Hz)
• Module Power: 3.6 W typical, 4.2 W maximum
• Operating Temperature: 0 °C to 60 °C (32 °F to 140 °F)
• Auxiliary Supply Terminals: PS+/PS- not used by this module

Key Features

• Eight RTD Channels in One Module: Eight independent temperature inputs, each configurable for 3-wire or 4-wire RTD.
• Wide Range Coverage: One personality module serves every scale in the module range table — no separate range variant is needed per RTD type.
• Lead-Resistance Compensation: In 3-wire mode the module measures lead resistance periodically and corrects the reading, removing cable-resistance error.
• High Common Mode Rejection: 120 dB CMRR at power-line frequency keeps readings stable in electrically noisy plant areas.
• Channel-Level Diagnostics: Front LEDs report power, communication, internal fault and a per-channel error (positive/negative overrange or channel communication failure).
• Self-Calibration on Demand: Calibration can be triggered from the controller without removing the module.
• Field Wiring Terminals: +IN/-IN sense inputs, SRC current source, RTN return, SH and earth ground for shield landing.

Typical Applications

• Bearing, winding and process temperature monitoring on turbines and generators
• Reactor and vessel temperature loops in chemical and petrochemical plants
• Feedwater and steam temperature measurement in power generation
• Replacement of a failed RTD personality module in an existing Ovation I/O base

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