Description
GE PACSystems RX3i IC694MDL350 — 120 VAC Discrete Input Module for Reliable Plant Signal Acquisition
The IC694MDL350 is a GE PACSystems RX3i discrete input module designed for bringing 120 VAC field signals into your control system with stable filtering and isolation. From my experience, it’s a straightforward drop-in for brownfield upgrades where sensors, relays, or limit switches are already on 120 VAC, and you want clean, debounced status into the PLC without extra interface hardware. You might notice that it fits as a single-wide RX3i I/O slice, with front status LEDs that make panel checks quick during commissioning or fault finding.
Typical use cases include motor starters and interlocks, conveyor and line safety contacts, packaging machine status, and facility signals that have historically been wired at 120 VAC. One thing I appreciate is the optical isolation per channel group and the conservative input thresholds that help reject noise in electrically busy panels.
Order Placement Process and Guarantees
- Warranty: 365 days
- Delivery time: 1 week for in-stock; no more than one month at the latest
- Payment: 50% advance payment; full payment before delivery
- Express delivery: FedEx, UPS, DHL
Key Features
- 120 VAC discrete inputs – Suited for legacy and utility-grade field devices that switch mains-level control signals.
- Noise-resistant input filtering – Helps avoid false transitions in electrically noisy panels, typically important on long cable runs.
- Optical isolation – Isolates field wiring from PLC logic to protect the rack and minimize ground loops.
- Front-panel status LEDs – Fast visual diagnostics for each channel; saves time during commissioning and maintenance.
- RX3i rack integration – Installs in standard PACSystems RX3i baseplates and is typically hot-swappable with proper procedures.
- Removable terminal block – Streamlines replacement; wiring stays on the terminal strip while the module is swapped.
Technical Specifications
| Brand / Model | GE PACSystems RX3i / IC694MDL350 |
| Product Type | Discrete input module (AC) |
| HS Code | 8538.90 (Parts suitable for use with industrial control apparatus) |
| Nominal Input | 120 VAC, 50/60 Hz (discrete) |
| Channel Count | Multiple isolated input points; typical RX3i density for 120 VAC modules |
| Backplane Power | 5 VDC from RX3i backplane (typically < 250 mA) |
| Isolation | Optically isolated inputs; field-to-logic isolation typical for RX3i I/O |
| Communication Interfaces | RX3i backplane bus (no front serial/ethernet on the module) |
| Installation Method | Plugs into RX3i baseplate slot; removable terminal block for field wiring |
| Operating Temperature | 0 to 60°C (32 to 140°F), typical for RX3i modules |
| Dimensions & Weight | Single‑wide RX3i form factor; approx. 132 × 33 × 120 mm; ~0.3 kg |
Notes: Exact channel count and thresholds can vary by sub‑revision; if you’re matching an installed base, I typically double-check the module label and user manual against the I/O list.
Related or Supporting Products
- IC694TBS032 – 32‑point screw terminal block; the usual companion for RX3i discrete I/O.
- IC694TBB032 – 32‑point spring clamp terminal block; faster field wiring in many cases.
- IC695CHS0xx – RX3i baseplates (various slot counts) for system expansion.
- IC694MDL6xx series – 24 VDC discrete input modules if you need low‑voltage sensors instead of 120 VAC.
- IC694ALG/IC694APU – Analog and specialty modules for mixed I/O racks.
A packaging OEM shared that swapping to the IC694TBB032 spring terminal block with this module cut their changeover time, since they could pre‑wire harnesses and plug them in during a brief stop. Small detail, but it seems to pay off in real plants.
Installation & Maintenance
- Panel & environment: Mount the RX3i baseplate on a grounded DIN rail inside an enclosure that meets IP/UL industrial standards; allow space for ventilation.
- Wiring: Use appropriately rated cable for 120 VAC; land field wires on the removable terminal block and keep AC and low‑level signals separated to reduce noise.
- Shielding & routing: In most cases, route high‑voltage and control wiring in separate ducts; tie shields at one end to minimize loops.
- Hot swap: RX3i I/O is typically hot‑swappable, but follow your site’s LOTO and the PACSystems manual to avoid unintended transitions.
- Maintenance: Periodically check terminal tightness, clean dust from the module face, and review diagnostics in the CPU. Firmware updates are unusual for simple I/O, yet keeping the CPU/firmware current helps with long‑term stability.
- Acceptance test: I usually recommend a quick loop check: toggle each field device and confirm matching LED and PLC tag state.
Quality & Certifications
- CE and UL Listed for industrial control equipment (typical for RX3i modules)
- RoHS compliant versions commonly available
- Manufacturer-grade build for continuous industrial operation
- Warranty: 365 days
Need help validating the exact sub‑model or channel count? Send a photo of your current module label or your I/O list, and I’ll match it so you don’t have to rewire or remap tags.
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