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3. Key Technical Specifications
The Honeywell 05701-A-0351 Field Interface Card is the dedicated rear termination module for System 57 control racks. It provides physical terminal points for field gas detectors, external alarm output wiring, and DC power routing.
| Parameter | Value |
| Part Number | 05701-A-0351 |
| Manufacturer | Honeywell Analytics (Zellweger Analytics) |
| System Architecture | System 57 8-Channel / 16-Channel 19-Inch Racks |
| Mounting Location | Rear backplane slot corresponding directly to front control card |
| Field Connections | Heavy-duty screw clamp terminal blocks |
| Signal Compatibility | 4–20 mA gas sensor inputs, catalytic bead inputs, and relay contacts |
| Isolation | Channel-to-frame surge and ESD bypass circuitry |
| Operating Temperature | -10°C to +55°C |
| Dimensions | Eurocard format rear interface profile |
4. Product Introduction & Supply Chain Strategy
The Honeywell 05701-A-0351 is a rear-mounted Field Interface Card designed for the Honeywell System 57 gas detection platform. It mounts directly to the backplane behind individual single-channel control cards (such as the 05701-A-0293), serving as the heavy-duty physical termination point for field wiring originating from remote toxic, flammable, or oxygen sensors.
Maintaining an uninstalled 05701-A-0351 as a New Surplus spare is an essential strategy for preserving plant safety uptime. Field interface cards absorb line transients, field wiring surges, and mechanical terminal wear. A damaged termination block or burnt PCB trace on a rear interface board isolates that entire gas monitoring channel. Procuring a genuine New Surplus unit ensures pristine screw terminals, intact PCB layers, and immediate drop-in restoration without facing long factory lead times or the risks of stripped screws and corrosion inherent in second-hand parts.
05701-A-0351
05701-A-0351
5. Installation & Configuration Guide
Critical Life Safety Warning
Field interface cards carry live sensor signal leads and power contacts. Replacing a rear interface card without isolating external power and inhibiting downstream trip logic can cause unexpected relay actuation or damage sensitive front-end control cards.
1.Safety Inhibit & Power Isolation:Prerequisite.
Inhibit the target monitoring channel at the System 57 engineering card or main safety panel. Disconnect external DC field power and loop power feeds supplying the target channel’s terminal block.
2.Field Wiring Unseating & Extraction:Removal.
Label each wire landed on the 05701-A-0351 terminal strip according to channel schematics. Unscrew field wire leads from the cage clamps. Remove the front-slot control card, then unscrew and slide out the 05701-A-0351 rear card from the backplane guide slots.
3.Hardware Replacement & Alignment:Insertion.
Inspect the edge connectors on the replacement 05701-A-0351 for clean surfaces. Align the card with the rear guide rails corresponding to the target front card slot and slide it in until fully seated in the backplane connector. Secure retaining screws.
4.Landing Wires & Channel Testing:Commissioning.
Re-land field wires into their designated screw terminals according to your site wiring diagram. Re-insert the front control card, restore power, clear the channel inhibit, and verify gas reading continuity in AppManager or on the card’s LCD display.
6. Firmware/Software Versions & Upgrade Notes
- Software Compatibility: The 05701-A-0351 is a passive hardware interface PCB containing no software, microprocessor, or flash memory.
- Slot Alignment: Must be installed in the exact rear backplane slot matching its corresponding front processing card (e.g., Slot 3 rear matches Slot 3 front).
- Terminal Verification: Ensure screw clamps are torqued properly to prevent high-resistance contacts on 4–20 mA analog signal loops.
- Surge Protection Notice: Inspect onboard surge suppressors (if equipped) whenever replacing a board following a lightning strike or field short event.
7. Frequently Asked Questions (FAQ)
Q: Is this Honeywell 05701-A-0351 field interface card genuinely new, or is it pulled from an old panel?
A: This product is a Brand New Surplus unit. It is not used, not pulled from a decommissioned plant, and not refurbished. All modules undergo rigorous quality verification to ensure OEM-level reliability.
Q: Why should I choose New Surplus over a lower-cost refurbished interface board?
A: Refurbished field interface cards often feature worn screw threads, hair-line trace fractures, and oxidized contact pins that cause intermittent signal dropouts on safety gas loops. Buying New Surplus guarantees pristine contact points, zero track degradation, and maximum operating life.
Q: Does every System 57 channel card require a 05701-A-0351 rear card?
A: Yes. Each single-channel control card slotted into the front of the System 57 rack requires a corresponding rear field interface card to land field wiring and relay contacts.
Q: Can I land both 2-wire and 3-wire gas detector cables on this board?
A: Yes. The 05701-A-0351 provides designated terminal points to accommodate 2-wire, 3-wire, and catalytic bead detector wiring configurations as specified in the System 57 manual.
Q: What warranty and quality verification accompany this unit?
A: Every 05701-A-0351 card is packaged in ESD-safe protective wrapping and includes a complete QC inspection report along with a full 1-year replacement warranty from the date of shipment.
