GE IC695ACC302
GE IC695ACC302 - Image 2

GE IC695ACC302

  • Product Introduction: This is a 2-axis high-speed counter module for the GE VersaMax PLC platform. It is designed for precision position tracking, speed measurement, and encoder feedback in motion control applications. The module accepts quadrature encoder signals (A/B phase) from incremental encoders and resolvers. It supports count rates up to 200kHz and provides 32-bit counter resolution. The “302” suffix indicates a 2-channel variant with specific input configuration. This module is commonly used in CNC machines, robotics, printing presses, and packaging equipment where accurate position feedback is critical.
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Category: SKU: GE IC695ACC302

Description

GE IC695ACC302

  • Technical Specifications:
    • Channels: 2 independent high-speed counter channels (Axis A, Axis B)
    • Input Type: Differential 24VDC (A/B quadrature)
    • Maximum Counting Frequency: 200kHz per channel
    • Counter Range: 32-bit signed (-2,147,483,648 to +2,147,483,647)
    • Input Voltage: 24VDC nominal (18-30VDC accepted)
    • Input Impedance: 120Ω differential termination (built-in)
    • Isolation: 500V RMS optical isolation from backplane
    • Power Consumption: ~1.5W
    • Operating Temperature: 0°C to 60°C
    • Dimensions: IC695 standard form factor
    • Weight: ~0.2 kg
  • Functional Features:
    • Quadrature Decoding: Supports A/B phase for direction detection and 4x edge counting
    • Hardware Counting: No CPU scan dependency — counts are captured in real-time
    • Modulo Counting: Auto-reset at preset value for repetitive motion
    • Latch Function: Snapshot counter value on external trigger
    • Compare Function: Generate interrupt when counter reaches preset value
    • Z-Phase Input: Supports index/home pulse for absolute position reference
    • Backplane Powered: No external power supply needed
  • Application Scenarios:
    • CNC machine axis position feedback
    • Robotic arm joint angle measurement
    • Print register control in printing presses
    • Conveyor length measurement
    • Winder tension control (diameter calculation)
    • Elevator position tracking
  • Performance Parameters:
    • Counting Resolution: 1x, 2x, or 4x mode (4x = 800kHz effective)
    • Response Time: <1µs per count
    • Common Mode Rejection: >1000V
    • Maximum Speed: 200kHz = 12,000 RPM for 500-line encoder at 4x mode
    • Bus Speed: VersaMax backplane, 10Mbps
    • MTBF: >200,000 hours
  • Material Composition:
    • Housing: UL94 V-0 ABS
    • PCB: 4-layer FR-4 with conformal coating
    • Input Stage: High-speed opto-isolators (LED + phototransistor) with 120Ω termination
    • Counter IC: FPGA or ASIC for hardware counting
    • Connectors: Gold-plated backplane edge, screw terminals for encoder wiring
  • Structural Features:
    • Standard IC695 module size
    • 2 LED status indicators per channel (Power, Count)
    • Screw terminals: A+, A-, B+, B-, Z+, Z- for each axis
    • 120Ω termination jumper (user-selectable)
    • DIN-rail mountable
  • Working Principle:
    • Incremental encoder outputs A and B phase signals (90° out of phase). The module’s high-speed input stage receives these differential signals through opto-isolators. An internal FPGA decodes the quadrature signals: if A leads B, the counter increments; if B leads A, it decrements. The 32-bit counter accumulates counts in hardware. The CPU reads the counter value via the backplane bus at any time. The Z-phase input provides a once-per-revolution index pulse for homing. All counting is done in hardware — the CPU is free for other tasks.
  • Installation Requirements:
    • Mount in IC695 chassis (VersaMax rack)
    • Use shielded twisted-pair cable for encoder connections
    • Connect shield to chassis ground at one end only
    • Set 120Ω termination jumper if encoder does not have built-in termination
    • Keep encoder cables away from power cables (>30cm separation)
  • Usage Precautions:
    • Do not exceed 200kHz input frequency — counts will be missed above this
    • Use differential inputs only — single-ended signals will not work
    • Verify encoder voltage is 24VDC — do not connect 5V encoders directly
    • Do not hot-swap the module — power down the rack first
    • Add external pull-up resistors only if encoder is open-collector type

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