Description
Honeywell 8C-PCNT02
Technical Specifications
- Channel count: 2 high-speed counter input channels
- Maximum measurable frequency: 100 kHz per channel
- Supported signals: 5 V DC quadrature encoder, 24 V DC pulse
- Resolution: 32-bit position counter
- Channel isolation: 500 VAC per channel
- Backplane interface: C300 I/O subrack bus
- Operating temperature: 0 °C to +60 °C
- Hot swap support: Online card replacement
Functional Features Quadrature encoder input, supports A/B phase counting for rotary position measurement. High-speed 100 kHz measurement, captures fast pulse events without count loss. Home position latch input, resets encoder position to zero on reference sensor signal. Per-channel signal loss diagnosis, triggers fault on broken encoder wiring. On-board LEDs indicate channel signal activity and fault status. Software-configurable input filtering for high-speed signals.
Application Scenarios High-precision rotary encoder position measurement High-speed turbine flow meter totalizing Motion control speed and position loops Fast rotating equipment vibration monitoring tachometers Spare part replacement for high-speed counter card faults
Performance Parameters
- Frequency measurement accuracy: ±0.01% of reading
- Minimum detectable pulse width: 5 μs
- Quadrature resolution: 4x edge decoding
- Counter overflow response: ≤1 ms
- Mean time between failures: 750,000 hours
Material Composition FR4 high-speed PCB substrate High-speed FPGA counter logic Differential line receivers for encoder signals Channel isolation optocouplers TVS protection diodes Gold-plated backplane edge fingers
Structural Features Standard C300 I/O card form factor. Front detachable terminal block for 2 high-speed channels. Differential trace routing for high-speed encoder signals, matched impedance. Per-channel signal activity LEDs. Isolation barrier separates field side and backplane.
Working Principle High-speed pulse and quadrature encoder signals connect to input terminals. Differential line receivers convert encoder A/B phase signals to logic levels. The FPGA counter decodes quadrature edges, accumulating position and frequency values at 4x resolution. Home position input resets the counter when the reference proximity sensor triggers. Converted count values are transmitted to the C300 controller over the backplane bus. Signal loss detection monitors input continuity; broken encoder wiring triggers a channel fault.
Installation Requirements Insert the card into a dedicated high-speed counter slot. Wire encoders and high-speed sensors to labeled terminals, use shielded differential cable. Configure quadrature mode and pulse scaling in Control Builder. Verify position counts match a reference encoder during commissioning.
Usage Notes High-speed encoder cable length must not exceed 10 meters; longer runs cause signal reflection and count errors. Differential encoder wires must be twisted pair, routed separately from power cables. Never exceed 100 kHz input frequency, oversaturation causes count loss. Home position sensor wiring must be shielded; electrical noise causes false position resets.
