Description
Honeywell 8C-PCNT01
Technical Specifications
- Channel count: 4 frequency counter input channels
- Input signal: 24 V DC pulse, dry contact
- Maximum measurable frequency: 1 kHz per channel
- Resolution: 16-bit counter
- Channel isolation: 500 VAC group isolation
- Backplane interface: C300 I/O subrack bus
- Operating temperature: 0 °C to +60 °C
- Hot swap support: Online card replacement
Functional Features Measures pulse frequency and total pulse count per channel. Software-configurable input debounce filter for mechanical contact signals. Per-channel open circuit diagnosis, triggers fault alarm on broken sensor wiring. Pulse count latching, stores accumulated total for batch flow measurement. On-board LEDs indicate card power and channel signal activity. Configurable pulse scaling via Control Builder software.
Application Scenarios Turbine flow meter total flow and rate measurement Rotating equipment tachometer speed monitoring Conveyor belt speed sensing Batch totalizing flow loops Spare part replacement for frequency counter card faults
Performance Parameters
- Frequency measurement accuracy: ±0.05% of reading
- Minimum detectable pulse width: 1 ms
- Input threshold: 15 V DC minimum ON, 5 V DC maximum OFF
- Counter resolution: 32-bit accumulated count
- Mean time between failures: 600,000 hours
Material Composition FR4 PCB substrate High-speed counter logic FPGA Input debounce filter circuits Optocoupler input isolators TVS protection diodes Gold-plated backplane edge fingers
Structural Features Standard C300 I/O card form factor. Front detachable terminal block for 4 channel wiring. Group isolation barrier between field side and backplane. Front LEDs indicate channel pulse activity. Anti-keying notch for correct slot alignment.
Working Principle Field sensor pulse signals connect to input terminals, routed through optocoupler isolation. The debounce filter removes contact bounce from mechanical switch signals. The FPGA counter counts pulse edges per channel, calculating frequency and accumulated total. Count values are packaged into bus frames, transmitted to the C300 controller. Open circuit detection monitors input loop continuity; broken sensor wiring triggers a channel fault flag.
Installation Requirements Insert the card into a dedicated counter input subrack slot. Wire flow meters and tachometer sensors to labeled terminals. Configure pulse scaling and debounce time in Control Builder. Verify measured frequency matches a reference tachometer during commissioning.
Usage Notes Mechanical contact sensors require sufficient debounce time; too-short debounce causes overcounting. Input pulse frequency must not exceed 1 kHz, higher frequency causes missed count events. Shielded cable for sensor wiring reduces EMI-induced false pulse counts. Never apply AC high voltage to input terminals, this destroys optocoupler inputs.
