GE HE693THM884M – 8-Channel Thermocouple Input Module | Series 90-30 PLC Platform
Engineering Background
The HE693THM884M is a high-accuracy analog input module developed by GE Fanuc (now GE Automation & Controls) for the Series 90-30 programmable logic controller family — one of the most widely deployed mid-range PLC platforms in North American and global industrial automation. Designed for demanding thermal measurement applications, this module bridges field-level thermocouple sensors directly to the PLC backplane with onboard cold-junction compensation and multi-type TC support.
Product Positioning
Targeted at process engineers and control system integrators who require reliable, spec-accurate temperature acquisition within an existing Series 90-30 architecture. The HE693THM884M eliminates the need for external signal conditioners, reduces panel wiring complexity, and delivers 16-bit resolution temperature data directly to the CPU — making it the preferred choice for furnace control, HVAC monitoring, food processing, and chemical process applications.
Complete Technical Specifications
- Part Number: HE693THM884M
- Manufacturer: GE Fanuc / GE Automation & Controls
- Platform Compatibility: Series 90-30 PLC (IC693 family)
- Module Type: Analog Input — Thermocouple
- Number of Channels: 8 differential thermocouple inputs
- Thermocouple Types Supported: J, K, T, E, R, S, B (IEC/NIST standard curves)
- Resolution: 16-bit (0.1 °C / 0.1 °F display resolution)
- Measurement Range: Type-dependent; e.g., Type K: −200 °C to +1372 °C
- Cold Junction Compensation: Onboard automatic CJC
- Open-Circuit Detection: Yes — upscale burnout detection per channel
- Isolation: Channel-to-backplane optical isolation
- Update Rate: All 8 channels scanned per PLC scan cycle
- Power Consumption: Supplied via Series 90-30 backplane (5 VDC)
- Module Weight: Approx. 620 g
- Operating Temperature: 0 °C to +60 °C
- Storage Temperature: −40 °C to +85 °C
- Relative Humidity: 5% to 95% non-condensing
- Certifications: UL Listed, CE Marked
- Form Factor: Single-slot Series 90-30 I/O module
- SKU / Order Code: HE693THM884M
Proven Application Environments
- Industrial Furnace & Kiln Control: Continuous high-temperature monitoring with Type R/S/B thermocouples across multiple zones
- HVAC & Building Automation: Multi-point duct and plenum temperature acquisition integrated into Series 90-30 BAS controllers
- Food & Beverage Processing: Pasteurization and sterilization temperature logging with Type T/J sensors for FDA compliance
- Chemical & Petrochemical Plants: Reactor and heat exchanger temperature profiling in hazardous-area panel installations
- Plastics & Rubber Extrusion: Barrel zone temperature control with Type K thermocouples and closed-loop PID via Series 90-30 CPU
- OEM Machine Builders: Drop-in thermal monitoring for legacy and new Series 90-30 machine platforms requiring IEC-standard TC inputs
Engineering Advantages
- Onboard CJC eliminates external compensation hardware — reduces BOM cost and panel wiring by removing the need for isothermal terminal blocks
- Multi-type TC flexibility — a single module supports J, K, T, E, R, S, B curves, configurable per channel via software, avoiding module proliferation
- Open-circuit burnout detection — each channel independently flags sensor failure, enabling the CPU to execute safe-state logic without additional field wiring
- 16-bit resolution — 0.1 °C granularity supports tight process tolerances in pharmaceutical and food-grade applications
- Direct backplane integration — no external power supply or signal conditioner required; module draws power from the Series 90-30 rack
- Drop-in replacement compatibility — pin-for-pin and software-compatible with existing Series 90-30 thermocouple module slots; no CPU reprogramming required for hardware swap
System Architecture & Signal Flow
Field thermocouple pairs connect to the module’s screw-terminal block (differential input per channel). The onboard multiplexer sequentially routes each channel through a precision instrumentation amplifier and 16-bit ADC. The onboard CJC sensor measures terminal block temperature and applies the standard polynomial correction in firmware. Linearized temperature values (in 0.1 °C units) are written to the Series 90-30 analog input register table (%AI) each PLC scan cycle. The CPU accesses data via standard GE Proficy Machine Edition ladder or structured text — no special function blocks required. Open-circuit conditions set the corresponding channel’s value to the upscale limit and assert a fault bit in the module status word.
Sourcing & Quality Verification
- Source: Konmask.com sources HE693THM884M units from authorized industrial distributors and verified OEM decommission channels
- Inspection: Each unit undergoes visual inspection, label verification, and functional power-on check prior to listing
- Condition: New surplus or refurbished units clearly indicated in variant/listing notes
- Traceability: Date codes and firmware revision documented where available
- Warranty: 90-day Konmask operational warranty; extended coverage available on request
- Counterfeit Prevention: All units verified against GE Fanuc OEM markings, PCB revision codes, and holographic labels where applicable
Procurement Process
- Confirm compatibility — verify your Series 90-30 rack model (IC693CHS391/392/397) and available slot count
- Add to cart — select quantity; bulk pricing available for orders of 3+ units (contact support)
- Submit PO or online order — B2B net-30 terms available for verified industrial accounts
- Receive & inspect — units ship with inspection report; contact support within 5 business days for any discrepancy
- Commission — insert module into rack, configure channel types in Proficy ME I/O configuration, verify %AI register mapping, and run loop check
Technical FAQ
- Q: Is the HE693THM884M compatible with the IC693CPU374 CPU?
- A: Yes. The module is compatible with all Series 90-30 CPUs (IC693CPU311 through IC693CPU374) and all standard IC693 rack sizes.
- Q: Can I mix thermocouple types on the same module?
- A: Yes. Each of the 8 channels is independently configurable for TC type (J, K, T, E, R, S, B) via the Proficy Machine Edition I/O configuration tool — no hardware changes required.
- Q: What happens if a thermocouple wire breaks?
- A: The module’s open-circuit detection drives the affected channel’s %AI value to the upscale limit and sets a fault bit in the module status word, allowing the CPU to execute a safe-state response.
- Q: Does this module require an external power supply?
- A: No. The HE693THM884M is fully powered by the Series 90-30 backplane 5 VDC bus. No auxiliary 24 VDC supply is needed.
- Q: What is the difference between HE693THM884M and HE693THM884?
- A: The “M” suffix typically denotes a minor hardware revision (PCB or component update) with full backward compatibility. Functionally and software-wise, both are interchangeable in Series 90-30 applications.
- Q: Can I use this module with a VersaMax or PACSystems RX3i rack?
- A: No. The HE693THM884M is designed exclusively for the Series 90-30 (IC693) backplane. It is not compatible with VersaMax, PACSystems RX3i, or RX7i racks.
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