Honeywell 900H01-0102 8-Channel Digital Relay Output Module

Configured for discrete output switching and relay actuation in HC900 control systems, the Honeywell 900H01-0102 (900H01 Digital Relay Output Module) provides direct electrical execution. The module offers eight electromechanical relay outputs for field device control, alarm annunciation, interposing relay circuits, and process shutdown functions through isolated relay contacts.

Hardware Specifications

Channel-to-Channel Isolation Architecture

The 900H01-0102 incorporates 2500 VAC galvanic isolation between relay contacts and internal control electronics. Channel-to-channel isolation reduces the possibility of electrical interaction between adjacent output circuits and helps maintain independent switching performance across multiple field devices.

Relay outputs are suitable for interfacing with motor starters, annunciators, interposing relays, shutdown circuits, and discrete control equipment. Isolation barriers separate field-side switching voltages from the controller backplane logic domain.

Frequently Asked Questions

Q: Does the module include internal fuse protection?
A: No. External fusing should be provided for each output channel according to the connected load and field wiring requirements.

Q: Can the module be replaced while the controller remains energized?
A: Yes. The module supports Removal and Insertion Under Power (RIUP). External field power should be isolated before disconnecting terminal wiring.

Q: What is the maximum relay load rating?
A: Each relay channel supports up to 4 A for resistive loads, with a maximum switching voltage of 250 VAC or 30 VDC.

Field Installation Guidelines

• Verify output load ratings before wiring.

• Install external channel fusing as required.

• Isolate field power before terminal work.

• Separate relay wiring from analog signal cables.

• Confirm NO and NC contact assignments.

• Verify channel indication LEDs during commissioning.