Description
GE PACSystems RX3i IC694MDL250 – Discrete AC Input Module for Reliable Field Sensing
The IC694MDL250 is a PACSystems RX3i discrete input module designed for AC field signals. From my experience, it’s the kind of card maintenance teams choose when they need straightforward, noise‑tolerant 120 VAC sensing on production lines, utilities skids, or building systems. You might notice that it drops into an RX3i rack without fuss and brings consistent point diagnostics, which, in many cases, shortens troubleshooting time during shift change.
Company’s Order Placement Process and Guarantees
- Warranty: 365 days
- Delivery: 1 week if in stock; no more than one month at the latest
- Payment: 50% advance; full payment before delivery
- Express options: FedEx, UPS, DHL
- We pre‑test modules before shipment and provide basic installation guidance if needed.
Key Features
- 120 VAC discrete inputs (50/60 Hz): Suited for limit switches, float switches, contactors, and panel signals commonly found in plant environments.
- Noise tolerance and input filtering: Typically includes debounce/filtering that helps with contact bounce or electrically noisy equipment.
- Per‑point status LEDs: Quick visual diagnostics on the front panel, which in many cases reduces downtime during fault tracing.
- Backplane‑powered: Draws 5 VDC from the RX3i rack; no external auxiliary power for logic needed.
- Isolated field channels: Channel‑to‑backplane isolation to help protect the CPU and other cards from field transients.
- Removable terminal connector: Makes swap‑outs faster—one thing I appreciate when changeovers are tight.
Technical Specifications
| Brand / Model | GE PACSystems RX3i / IC694MDL250 |
| HS Code | 8538.90 (Parts suitable for electrical control panels/PLCs) |
| Power Requirements | 5 VDC from RX3i backplane (typical module consumption is low; no separate field power for logic) |
| Dimensions & Weight | Approx. 132 × 35 × 120 mm; ~0.3 kg (typical for RX3i discrete modules) |
| Operating Temperature | 0 to 60 °C, 5–95% RH non‑condensing (typical RX3i environmental range) |
| Signal Input/Output Types | Discrete AC inputs, nominal 120 VAC, 50/60 Hz; per‑point status indication; configurable input filtering (typical) |
| Communication Interfaces | RX3i backplane bus; no external communication port on the module |
| Installation Method | Installs in an RX3i rack slot; field wiring via front removable terminal block |
Related or Supporting Products
- IC694MDL240 / IC694MDL241 (RX3i) – Similar AC input modules at 120 VAC with different point densities. Choose when you need fewer/more input points on one card.
- IC694MDL645 / IC694MDL660 (RX3i) – 24 VDC discrete input modules; better fit for sensors and PLC cabinets wired in DC.
- IC694MDL754 (RX3i) – 12/24 VDC transistor output; pairs with the MDL250 when you also need high‑density DC outputs.
- RX3i CPUs and Racks (IC695 series) – For system expansion; the MDL250 operates in an RX3i rack alongside IC695 CPUs and comms.
- Terminal blocks / wiring kits – Removable connectors and pre‑wired cables to speed installation and reduce panel wiring errors.
Installation & Maintenance
- Panel/cabinet: Mount the RX3i rack on DIN rail or panel per manufacturer spacing. Provide ventilation; avoid heat sources that could push internal temps close to 60 °C.
- Wiring: Use appropriately rated conductors for 120 VAC inputs. Keep AC signal wiring separate from high‑power cables to minimize noise. Tighten terminal screws to the recommended torque.
- Grounding & isolation: Bond the cabinet ground and follow RX3i grounding practices. The module provides channel‑to‑backplane isolation; do not rely on it as the sole protective isolation for safety circuits.
- Commissioning: Verify input thresholds with a test source at line frequency (50/60 Hz). Enable input filtering in the hardware configuration when handling mechanical contacts prone to bounce.
- Routine maintenance: Inspect connectors quarterly, clean dust with dry air, and review status LEDs. Firmware for the CPU/rack should be kept current; the I/O module itself typically requires no user firmware updates.
- Safety: De‑energize field circuits before servicing. Lockout/tagout is recommended—one plant electrician told us this simple habit has prevented most accidental trips.
Quality & Certifications
- CE and UL/cUL listed for industrial control equipment (typical for RX3i modules)
- RoHS compliant
- Manufacturing quality aligned with ISO 9001 processes
- Warranty: 365 days (our supply guarantee). Manufacturer’s standard limited warranty applies in addition to this, where available.
Quick field note: A packaging client uses the IC694MDL250 for door interlocks and pump permissives at 120 VAC. What stood out to them is the steady LED feedback—operators can see what’s on at a glance, which, in most cases, cuts diagnosis time during a line stop.
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