Honeywell 8C-TDOD51 51306975-175 Digital Output Relay Modules

The Honeywell 8C-TDOD51 51306975-175, also cataloged as the 8C-TDOD51 Digital Output Module, operates as a dedicated hardware component for discrete load switching and binary signal execution within Honeywell C300 controller systems. The module interfaces 8 independent dry contact relay output channels to control external field devices at 24 VDC. Integrated channel signal conditioning and optical isolation layers decouple central processing logic from field-induced electrical noise and voltage transients across connected control loops.

Hardware Specifications

Channel-to-Channel Isolation & Signal Conditioning

The 8C-TDOD51 51306975-175 incorporates physical channel-to-channel isolation and galvanic optical barriers between internal backplane logic arrays and discrete relay contact nodes. Each channel features programmable signal filtering and configurable debounce time settings to eliminate mechanical contact chatter during state transitions. Integrated current-limiting safeguards shield the internal switching matrix against short-circuit overcurrent conditions, maintaining deterministic state execution and preventing electrical noise propagation into the Experion C300 backplane bus.

Frequently Asked Questions

Q: What is the maximum continuous current rating per relay contact on the 8C-TDOD51 51306975-175?

A: Each dry contact relay output channel is rated for a maximum continuous switching current of 2 A at 24 VDC.

Q: Are the contact output channels galvanically isolated from the internal logic backplane?

A: Yes, internal optical isolation stages decouple the 8C-TDOD51 backplane processing components from field-side switching contacts and transient ground loops.

Q: Can debounce times be adjusted on individual relay channels?

A: Yes, each output channel supports programmable debounce time settings and signal filtering configurable through the controller programming software.

Field Installation Guidelines

1. Bond the Experion IOTA backplane mounting rail directly to the main cabinet Earth ground bar using a low-impedance copper conductor (minimum 4 mm2 / 10 AWG).
2. Ensure all external 24 VDC field power sources are de-energized before inserting or removing the 8C-TDOD51 51306975-175 module from its IOTA slot.
3. Route field wiring in grounded metallic cable trays maintaining a minimum clearance of 300 mm from high-voltage AC lines and variable frequency drive leads.
4. Ground all external signal and power cable shields at a single point on the cabinet Earth rail to eliminate circulating ground currents.
5. Secure all terminal block wiring screws firmly to the recommended torque specification (0.5 to 0.6 Nm) to preserve low-resistance gas-tight contacts.