Description
Honeywell 8C-TAOXA1
Technical Specifications
- Channel count: 4 analog output channels
- Signal type: 4–20 mA DC
- Resolution: 12-bit DAC
- Isolation: 500 VAC group isolation
- Maximum loop load: 600 Ω
- 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 protection. Configurable fail-safe output value on controller stop. Digital output filter smooths control signals. On-board LEDs indicate card power and fault status. Software-configurable output scaling.
Application Scenarios Small process unit control valve drive loops Low-channel-count modulation applications Cost-optimized small C300 system I/O Spare part replacement for low-density analog output card faults
Performance Parameters
- Output accuracy: ±0.2% full scale
- Update rate: 10 ms per channel
- Short circuit current limit: 30 mA
- Mean time between failures: 500,000 hours
- Operating humidity: 5% to 95% non-condensing
Material Composition FR4 PCB substrate 12-bit DAC chip Output operational amplifier array Group isolation optocouplers TVS protection diodes Gold-plated backplane edge fingers
Structural Features Compact C300 low-density I/O form factor. Front detachable terminal block for 4 channel wiring. Isolation barrier between field side and backplane. Front status LEDs for card run and fault.
Working Principle Controller setpoint values travel over the subrack bus to the card. Each channel routes values to the 12-bit DAC, converting digital commands to analog current signals that drive connected field actuators. Short circuit protection limits output current on overcurrent events. On controller stop, outputs revert to the pre-configured fail-safe value.
Installation Requirements Insert the card into a dedicated low-density analog output slot. Wire field actuators to labeled terminals. Configure output scaling and fail-safe values in Control Builder. Verify output operation during commissioning.
Usage Notes Loop load must not exceed 600 Ω. Never short-circuit output terminals repeatedly; repeated short circuits damage the output driver. Shielded cable for analog output reduces control signal noise. Never apply external power to output terminals, reverse voltage destroys the DAC chip.
