Description
Product Introduction & Engineering Value
Managing tight thermal profiles on legacy Series 90-30 racks usually forces engineers to choose between slow PLC-calculated PID loops or bulky external standalone controllers. The GE Fanuc IC693TCM302 eliminates that headache by offloading multi-zone PID execution directly onto an intelligent backplane module, keeping loop execution fast and main CPU scan times completely unburdened.
Equipped with eight independent thermocouple channels and eight matching solid-state 24 VDC pulse-width modulation (PWM) outputs, this unit delivers tight local loop processing. It seamlessly passes reference and configuration data to the PLC processor via %Q and %AQ memory registers, combining local real-time reaction speed with central system supervision.
Technical Specifications
| Parameter | Specification Details |
| Input Channels | 8 Isolated Thermocouple Inputs (Supports Types J, K, L) |
| Output Channels | 8 Solid-State Sourcing Outputs (18–30 VDC) |
| External Field Power | 18 to 36 VDC (2.5 A maximum inrush) |
| Backplane Power Used | 150 mA @ 5 VDC |
| Output Load Current | 100 mA maximum per channel |
| PWM Cycle Range | Programmable from 0.1 to 60 seconds |
| Common Mode Voltage | ±12 VDC maximum |
| Diagnostics | 12 Front-panel LEDs for loop and fault indication |
| On-Board Protection | Internal 2-Amp replaceable fuse behind bezel |
| Operating Temp | 0°C to 55°C (32°F to 131°F) |
Field Application & The “Trench” Experience
The Trench Story: During a midnight emergency call at a plastics extrusion plant, Barrel Zone 4 on a blow-molding line runaway-tripped due to a failed solid-state relay that shorted the module’s field output. The original IC693TCM302 blew its internal 2A board-level protection fuse. After replacing the downstream shorted SSR, the maintenance team swapped in our pre-tested surplus IC693TCM302 module, verified the cold-junction offset in Logicmaster 90, and restored the zone’s auto-PID cycle time to 0.5 seconds—returning the line to full production in under 45 minutes.
- Plastic Injection Molding & Extrusion Barrel Heating: Precise multi-zone PID temperature maintenance using high-frequency PWM driving external SSR heat banks.
- Blister Packaging Heat-Sealing Jaws: Rapid thermal feedback and tight off-state output leakage management (under 0.1 mA) to prevent heater heat creep during idle cycles.
- Industrial Annealing Oven Zone Control: Independent 8-channel temperature tracking across long multi-pass conveyor furnaces utilizing J and K thermocouple curve profiling.
- IC693TCM302
- IC693TCM302
Transparency SOP: QA & Testing
- Visual & Hardware Audit: Complete physical inspection of the module case, backplane card-edge connector, terminal blocks, and front bezel assembly.
- On-Board Protection Check: Verification and continuity testing of the internal 2 Amp user-replaceable fuse mounted behind the front panel.
- Power-On Self Test (POST): Mounting onto a Series 90-30 test rack (IC693CHS391) to verify memory integrity, internal 5 VDC backplane draw, and initial LED diagnostics.
- Thermocouple Input Calibration: Injecting mV signals across all 8 thermocouple channels to verify 12-bit ADC tracking accuracy within ±1°C and test open-circuit/reverse-polarity fault detection.
- Output Load Testing: Cycling all 8 DC sourcing outputs at 100 mA load across various PWM duty cycles (0.1s to 60s) under 24 VDC external supply.
The Veteran’s Tech Trap Guide
⚠️ DIP Switch & Register Allocation: Ensure your %Q and %AQ memory allocations in Logicmaster or PAC Machine Edition match the module’s configured slot position. A register mismatch will cause the TCM to remain in manual mode or fail to update PID duty cycles.
⚠️ Cold Junction Compensation & Shielding: Thermocouple lead wire extension cables must match the thermocouple type exactly (e.g., Type J to Type J). Run shielded pairs separately from heavy 480V motor cabling. Shield grounding must occur at a single cabinet point; ground loops can corrupt the module’s cold-junction reference reading.
PRO TIP: If all front LEDs flash or an output channel abruptly drops offline, do not assume the entire module is burnt. Remove the front bezel and check the internal 2-Amp fast-acting subminiature fuse first—it frequently trips during external wiring shorts or SSR failures to save the output transistors.
Dynamic FAQ
Q: How does the IC693TCM302 handle a thermocouple wire break during operation?
A: The module automatically detects open-circuit faults and triggers a diagnostic LED on the front panel. Depending on your pre-programmed configuration settings, the module will either safely shut off the output channel immediately or hold a preset manual duty cycle to prevent thermal shock.
Q: Can this module operate without a continuous CPU scan connection?
A: Yes. Because the processes PID calculations on its local micro-controller, it can maintain closed-loop temperature control based on its last received setpoints even if the main PLC CPU momentarily pauses scan updates.
Q: Is external 24 VDC field power required, or does it run entirely off the rack backplane?
A: The module uses 150 mA at 5 VDC from the backplane for logic processing, but requires an external 18 to 36 VDC power supply to drive the 8 solid-state control outputs.
Q: What condition are your “New Surplus” and “Refurbished” units in?
A: Every unit undergoes our multi-point testing procedure, including 8-channel signal simulation, SSR load testing, and backplane POST verification. All surplus units are backed by our comprehensive warranty and shipped in anti-static ESD packaging.
Start Chat
