IC693TCM303 GE Fanuc 8-In/8-Out Thermocouple RTD

GE Fanuc IC693TCM303 Temperature Control Module

The GE Fanuc IC693TCM303 is a high-precision, 8-channel temperature control module designed for Series 90-30 PLC systems. Supporting direct thermocouple and RTD sensor interfacing alongside 8 dedicated solid-state outputs, it executes closed-loop PID thermal control independent of the main CPU overhead.

Key Advantages

• Dual Sensor Versatility: Integrates high-impedance thermocouple circuits and 100-Ohm RTD curves onto a single hardware platform.
• Backplane Safety Isolation: Features 1000 Volts optical isolation from the PLC backplane to prevent ground loop damage to processor lines.
• Built-In Fault Overload: Protects execution lines with an ultra-fast 700 mA current overload threshold that trips within 2 ms of a field fault.

Technical Specifications

Quick Installation

• Module Insertion: Insert the module into any standard I/O slot of the Series 90-30 baseplate assembly.
• Sensor Shielding: Keep thermocouple loop impedance under 35 Ohms and use twisted, shielded cables to mitigate ambient noise.
• Field Power Loop: Connect an external 24 VDC nominal power source to manage the output transistor blocks, sizing the circuit breaker for a 2.5 A transient inrush.

Technical FAQs

Q1: What happens if an actuator line draws too much current?
A1: The module incorporates a 700 mA typical overload threshold. If current surges beyond this limit, the channel shuts down within 2 ms to prevent internal trace melting.

Q2: Why is the input wire impedance limited to 35 Ohms?
A2: Maintaining a low thermocouple run impedance ensures highly accurate signal conversion and prevents voltage measurement attenuation over distance.

Q3: Does the module draw all its driving power from the PLC baseplate?
A3: No. It only draws a marginal 150 mA from the 5 VDC backplane rail for internal logic. Driving the active field outputs requires an external 18 to 36 VDC power supply loop.