1. Basic Information

Honeywell SC-PCMX01 (51307195-175) is a high-precision pulse count input module dedicated for Honeywell TDC3000 DCS systems. It is designed to collect pulse signals from flow meters, encoders and speed sensors, realizing pulse counting, frequency conversion, flow accumulation and speed calculation.

2. Technical Specifications

2.1 Core Function & Acquisition Specifications

• Model: SC-PCMX01, Part No.: 51307195-175, Type: Intelligent Pulse Count Input Module
• System Compatibility: Fully adapted to Honeywell TDC3000 DCS system and native backplane bus protocol
• Signal Adaptation: Pulse flow meters, encoders, speed sensors and pulse-type instrumentation
• Core Functions: Pulse acquisition, cumulative counting, frequency conversion, flow/speed calculation and batch measurement
• Sampling Performance: High-precision sampling with jitter filtering to avoid counting errors caused by field interference
• Counting Mode: Incremental counting, reversible counting and cyclic zero clearing for diverse process logic
• Data Protection: Anti-overflow algorithm and power-off data retention to ensure continuous measurement data
• Signal Type: Compatible with active and passive dry contact pulse signals

2.2 Electrical & Input Specifications

• Power Supply: 24V DC TDC3000 rack backplane power supply, no external power required
• Input Signal: Standard industrial pulse signal, compatible with low-voltage active and passive pulse
• Frequency Range: Covers conventional frequency bands of industrial flow and speed instruments
• Channel Design: Independent isolated channels, single-channel fault does not affect other channels
• Protection Mechanism: Built-in over-voltage, over-current and surge protection
• Isolation Performance: Per-channel photoelectric isolation to eliminate field signal crosstalk

2.3 Diagnosis & Operation Characteristics

• Power-on Self-test: Comprehensive self-inspection of chip, channels, power and communication circuit
• Real-time Channel Monitoring: Continuously monitors signal connection, validity and circuit status
• Fault Diagnosis: Automatically identifies open circuit, short circuit and abnormal data fluctuation
• Status Indication: Onboard LED indicators for operation, communication, signal and fault status
• Fault Tolerance: Automatically filters invalid clutter pulses to ensure stable acquisition
• Data Traceability: Uploads real-time counting and cumulative data for curve display and report generation

2.4 Environmental & Protection Specifications

• Operating Temperature: -40℃～+70℃, suitable for long-term cabinet constant temperature operation
• Storage Temperature: -40℃～+85℃, excellent high and low temperature shock resistance
• Humidity Range: 5%～95%RH (non-condensing), dust-proof and moisture-proof
• EMC Performance: Industrial anti-interference design resisting harmonic and electromagnetic interference
• Structural Stability: Vibration-resistant and anti-loose design for long-term industrial operation

2.5 Physical Structure Specifications

• Structure Type: Standard TDC3000 modular I/O board with compact high integration
• Installation Method: Backplane plug-and-play installation with convenient replacement
• Compatibility: Perfectly matches TDC3000 cabinet and bus architecture
• Supporting Adaptation: Seamlessly matched with all TDC3000 series main control and I/O cards

3. Working Principle

1. Power-on Initialization & Self-test: After 24V DC power-on, the module completes full hardware self-inspection, initializes pulse sampling parameters and data storage partitions, synchronizes system clock, and enters standby acquisition state.
2. Field Pulse Signal Acquisition: Each independent channel receives pulse signals from field instruments, filters interference and jitter signals through photoelectric isolation circuits, and retains valid pulse waveforms.
3. Pulse Parsing & Data Operation: Counts valid pulses at high speed, calculates frequency, and converts into instantaneous flow, rotational speed and cumulative total parameters according to process coefficients, with data filtering and correction to avoid fluctuation.
4. Data Caching & Power-off Protection: Caches real-time and cumulative measurement data, retains data after power failure and restart, and ensures continuous measurement without data loss.
5. Bus Data Upload & Interaction: Uploads pulse counting values, instantaneous parameters and cumulative data to the DCS main control system and operator station to support process monitoring and measurement statistics.
6. Fault Monitoring & Self-recovery: Monitors channel status in real time, alarms for abnormal signals, isolates faulty channels to ensure normal operation of other points, and automatically recovers after troubleshooting.

4. Application Scenarios

4.1 Industrial Flow Measurement & Accumulation Control

4.2 Equipment Speed & Operation Monitoring

4.3 Industrial Quantitative & Batch Control

4.4 Legacy DCS System I/O Repair & Expansion

4.5 Production Data Statistics & Compliance Traceability