The GE Electric HE693THM166, also cataloged as the HE693THM166 Thermocouple Input Module, operates as a dedicated hardware component for multi-channel temperature signal acquisition within GE Series 90-30 PLC backplane platforms. It conditions millivolt inputs from thermocouple field sensors, converts them to digital temperature values, and transfers the data across the backplane bus. The module executes internal cold junction compensation (CJC) algorithms to maintain signal accuracy across changing environmental conditions.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | HE693THM166 |
| Brand | GE |
| Origin | USA |
| Weight | 1.00 lbs (0.45 kg) |
| Dimensions | Single-Slot Series 90-30 Form Factor |
| Operating Temp | 32 to 140 deg F (0 to 60 deg C) |
| Power Consumption | 5 VDC Backplane Power |
| Module Type | Thermocouple Input Module |
| Input Channels | Multi-Channel Thermocouple |
| Signal Processing | Cold Junction Compensation (CJC) |
Channel-to-Channel Isolation and Cold Junction Compensation
The module incorporates analog front-end signal conditioning with channel-to-channel isolation to prevent ground loops and electrical interference from distorting low-level millivolt signals. Onboard cold junction compensation sensors continuously monitor terminal block temperatures to dynamically correct thermal voltage offsets. High-resolution analog-to-digital converters process sensor inputs in parallel, delivering precise digital temperature values directly to the PLC memory registers.
Frequently Asked Questions
Q: How does the HE693THM166 account for ambient temperature drift at the terminal block?
A: The module utilizes onboard cold junction compensation (CJC) temperature sensors to calculate and subtract terminal-junction thermal voltages in real time.
Q: How is the HE693THM166 powered during operation?
A: The module draws its operating power directly from the 5 VDC supply rails of the Series 90-30 rack backplane.
Field Installation Guidelines
Insert the module into a dedicated I/O slot on the Series 90-30 baseplate until the rear backplane edge connector locks completely. Tighten the top retaining screw to establish a firm chassis ground path to the rack. Route thermocouple extension wires using shielded, twisted-pair cabling specifically color-coded for the matched thermocouple type. Connect the cable shield to the system earth grounding bar at a single point to prevent high-frequency noise from introducing thermal reading jitter.
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