Honeywell 05701-A-0328 Relay Cards

Configured for single-channel alarm and status relay switching in Honeywell Analytics control platforms, the Honeywell 05701-A-0328 (05701-A-0328 Relay Card) provides direct physical/electrical execution. This compact module converts analog or digital input signals into discrete electromechanical relay outputs for safety interlocks and alarm notification. Measuring 170 x 25 x 112 mm and weighing 0.165 kg, the DIN-rail mountable card incorporates front-panel LED indicators to provide real-time channel status and fault diagnostics across operating temperatures ranging from -40 to 85 deg C.

Hardware Specifications

DCS Process Control & Alarm Switching Architecture

The relay card operates within 4-20 mA HART and discrete monitoring architectures to execute deterministic alarm contact switching. High-grade channel-to-channel isolation networks separate signal input processing from field-side relay contact circuits, preventing electrical noise propagation and voltage spikes from affecting system backplanes. Integrated signal conditioning circuitry compensates for ambient thermal variations across -40 to 85 deg C, ensuring precise alarm trip thresholds and reliable relay contact execution under harsh environmental conditions.

Frequently Asked Questions

Q: Does removing or inserting the relay card on the DIN rail interrupt signal loops on adjacent cards?

A: No, individual DIN rail mounting and modular terminal block connections allow technicians to isolate and service a single card without disturbing adjacent control modules.

Q: How do the onboard LED indicators assist during field troubleshooting?

A: The front panel LEDs continuously reflect channel power, input signal presence, and relay energization states, allowing direct physical verification of alarm conditions without diagnostic software.

Field Installation Guidelines

Mount the relay card securely onto a standard 35 mm DIN rail, verifying that the rear retention clip seats fully to guarantee mechanical stability. Disconnect all loop power and external load circuits before attaching wiring to the terminal blocks. Route low-voltage analog and digital input cables in separate wire channels away from high-voltage relay switching lines, maintaining a minimum distance of 300 mm. Ground all cable shields at a single point on the enclosure earth ground bar to suppress electromagnetic interference and prevent circulating ground currents.