Description
Honeywell TC-OAV081
Technical Specifications
- Channel count: 8 analog voltage output channels
- Output signal range: 0–10 V DC
- Resolution: 12-bit DAC
- Channel isolation: 500 VAC group isolation
- Maximum load current: 5 mA per channel
- Backplane interface: V-series rack bus
- Fail-safe output: Configurable 0 V or 10 V safe value
Functional Features Per-channel independent voltage output, with output readback sampling monitoring. Automatic output of preset safe voltage value during communication failure. Per-channel independent short-circuit protection, automatically limits current on output short. Hardware output filtering, smooths control signal variation. On-board LEDs indicate card power, communication and overall fault status. Output accuracy ±0.1% full scale, meets precision regulation requirements.
Application Scenarios Electric control valve and actuator voltage signal drive Field recorder and digital meter analog voltage drive Continuous process control loop analog voltage output Spare part replacement for output drift and channel faults in legacy systems
Performance Parameters
- Output accuracy: ±0.1% full scale
- Short-circuit protection threshold: 10 mA
- Update rate: 20 ms per channel
- Isolation withstand voltage: 500 VAC for 60 seconds
- Fault switchover time: ≤50 ms
Material Composition FR4 PCB substrate 12-bit DAC chip Voltage output operational amplifier Optocoupler isolation devices Precision reference voltage chip TVS surge protection diodes Gold-plated backplane edge fingers UL94 V0 flame retardant plastic front panel
Structural Features Standard Eurocard dimensions, inserts into V-series rack I/O slots. Front screw terminals silk-screened per channel, marking output positive and negative polarity. Isolation barrier separates field output side and backplane logic side. Front panel LEDs display card run and fault status.
Working Principle Digital setpoint values from the controller travel via the backplane bus to the output card. The 12-bit DAC converts digital values to analog voltage signals, amplified and output to field loads by the operational amplifier drive circuit. Readback sampling continuously measures actual output voltage; deviation between measured feedback and command triggers a channel fault alarm. When communication is lost, the card outputs the pre-configured fail-safe value to place actuators in a safe position. Short-circuit detection circuit activates current limiting protection during overcurrent events.
Installation Requirements Use shielded twisted pair for output wiring, single-point shield grounding. Configure fail-safe output voltage value per channel in software. Ensure load impedance is no lower than 2 kΩ, to avoid output voltage droop. Calibrate zero and span output per channel after power-up.
Usage Notes Output terminal short circuit triggers protection; auto-recovery occurs after fault removal. Never connect external power to output terminals, reverse voltage destroys the DAC chip. Low load impedance causes insufficient output drive capability and signal deviation.
