Description
Honeywell 8C-TDODA1
Technical Specifications
- Channel count: 8 digital output channels
- Output type: 24 V DC NPN low-side switch
- Rated per-channel current: 0.5 A
- Group isolation: 500 VAC between field side and backplane
- Backplane interface: C300 I/O subrack bus
- Operating temperature: 0 °C to +60 °C
- Hot swap support: Online card replacement
Functional Features Low-channel-count form factor, suits small unit I/O configurations. Per-channel short circuit and overcurrent protection. Per-channel LED indicates output ON state. Configurable fail-safe output state on controller stop. Solid state switching, no mechanical contact wear.
Application Scenarios Small unit solenoid valve and alarm beacon drive loops Low-channel-count discrete output applications Cost-optimized small C300 system I/O Spare part replacement for low-density digital output card faults
Performance Parameters
- Output response time: ≤20 μs
- Short circuit protection threshold: 0.6 A per channel
- Off-state leakage current: ≤0.1 mA
- Total module current rating: 4 A
- Mean time between failures: 500,000 hours
Material Composition FR4 PCB substrate Power NPN transistor array Group isolation optocouplers Current sense resistors TVS protection diodes Gold-plated backplane edge fingers
Structural Features Compact C300 low-density I/O form factor. Front detachable terminal block for 8 channel output wiring. Group isolation barrier between field side and backplane. Per-channel output state LEDs.
Working Principle The C300 controller sends output commands over the subrack bus. On-board logic drives the channel optocoupler, activating the NPN power transistor to pull the field load circuit to ground, energizing the connected load. Current sense resistors monitor per-channel output current; overcurrent triggers automatic current limiting protection and channel fault latch. On controller stop, outputs default to pre-configured safe state.
Installation Requirements Insert the card into a dedicated low-density digital output slot. Wire field loads to labeled output terminals. Test channel on/off operation during commissioning.
Usage Notes Never exceed 0.5 A per-channel rated current, overload causes transistor overheating. Inductive loads require flyback diodes across coil terminals. Channel fault latch requires field short circuit resolution before software reset. Never connect AC high voltage to output terminals, high voltage destroys power transistors.
