Product Details
Configured for loop control and process variable regulation in Foxboro control systems, the Foxboro 761CNA-AT (761CNA-AT Single Station Micro Controller Module) provides direct physical/electrical execution for 4-20 mA DC input processing utilizing a 32-position terminal block interface.
Suffix Breakdown & Model Matrix
The 761CNA-AT identifier designates a specific single station micro controller configuration and power rating. According to technical documentation for the Foxboro 761 series platform:
- 761CNA: Base catalog model denoting the micro controller module architecture.
- -AT Suffix: Specifies specific terminal block layout, communication options, and power supply input configuration.
- Terminal & Power Architecture: Equipped with a 32-position terminal block and configured for 120 VAC line power operation.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 761CNA-AT |
| Brand | Foxboro |
| Weight | 8.60 lbs (3.9 kg) |
| Operating Temp | Industrial Operating Range |
| Power Consumption | 120 VAC, 50/60 Hz line power |
| Input Signal | 4-20 mA DC input |
| Terminal Block | 32-position terminal block |
4-20 mA HART Loop Protocol and Channel Isolation
Operating within Foxboro control loops, the micro controller module processes analog sensor inputs while maintaining robust galvanic isolation between the 120 VAC power mains and the low-voltage internal signal processing circuits. This isolation prevents line transients, surge voltages, and common-mode noise from propagating into connected control loops. The internal circuitry supports standard 4-20 mA HART loop protocol signals, applying internal filtering stages to suppress electrical noise and ensure conversion accuracy across the operator interface display and control outputs.
Frequently Asked Questions
Q: Does the 761CNA-AT controller module require a dedicated AC power line feed?
A: Yes. The module operates on 120 VAC (50/60 Hz) line power connected through the designated terminals on the 32-position terminal block.
Q: Can the 32-position terminal block remain wired during module removal or maintenance?
A: The terminal block is designed to interface directly with the controller housing, but power must be fully isolated before disconnecting field wiring or extracting the unit to prevent electrical shock or loop disruption.
Field Installation Guidelines
- Verify that 120 VAC power and all associated loop signals are isolated and locked out before handling or installing the controller.
- Inspect the 32-position terminal block wiring connections and pins for secure contact and freedom from oxidation.
- Mount the controller securely in its panel cutout or housing enclosure, fastening retention clips to withstand plant vibration.
- Check line voltage and grounding continuity before energizing the module.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
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Demystifying CPU Communication Ports in Siemens PLC Architectures
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Mastering the Siemens PLC Scan Cycle: How the CPU Executes Automation Programs
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