GE IC698ACC701
GE IC698ACC701 - Image 2

GE IC698ACC701

  • Product Introduction: This is a 4-channel high-speed counter module for the GE Fanuc 90-70 PLC platform. It accepts incremental encoder signals (A/B phase, Z index) for precise position and speed measurement. It supports both differential (RS-422) and single-ended (TTL) input types, making it compatible with a wide range of encoders from various manufacturers. It is commonly used in motion control, CNC machines, robotics, and web handling applications.
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Category: SKU: GE IC698ACC701

Description

 GE IC698ACC701

  • Technical Specifications:
    • Channels: 4 independent high-speed counter channels
    • Input Type: Differential (RS-422) or Single-ended (TTL 5V) — configurable per channel
    • Maximum Frequency: 5 MHz (differential), 1 MHz (single-ended)
    • Counter Resolution: 32-bit signed counter (−2,147,483,648 to +2,147,483,647)
    • Input Voltage: Differential: 5V peak-to-peak; Single-ended: 5V TTL
    • Input Impedance: 100Ω (differential), 10kΩ (single-ended)
    • Isolation: 500V RMS optical per channel
    • Backplane Interface: IC698 backplane (90-70 compatible)
    • Power Consumption: ~2W
    • Operating Temperature: 0°C to 60°C
  • Functional Features:
    • 4 independent counters with quadrature (A/B/Z) decoding
    • Supports up/down counting, modulo counting, latch, and capture
    • Hardware-based counting — no CPU scan dependency
    • Index (Z) pulse support for home position detection
    • Comparator function for position-based output triggering
    • Configurable via 90-70 PLC programming software
    • LED indicators per channel
  • Application Scenarios:
    • CNC machine axis position feedback
    • Robot joint position monitoring
    • Web tension control (roll diameter measurement)
    • Conveyor speed measurement via encoder
    • Elevator/hoist position tracking
    • Wind turbine pitch control
  • Performance Parameters:
    • Counting Accuracy: ±1 count at maximum frequency
    • Response Time: <100ns per count
    • Noise Immunity: >1000V common-mode rejection (differential mode)
    • Bus Speed: 90-70 backplane, 40Mbps
    • MTBF: >200,000 hours
  • Material Composition:
    • Housing: UL94 V-0 polycarbonate/ABS
    • PCB: 6-layer FR-4, conformal coated
    • Connectors: High-density D-sub or screw terminals (per channel)
    • Isolation: High-speed opto-isolators (LED + phototransistor)
    • Input Receivers: RS-422 line receivers (AM26C32 or equivalent)
  • Structural Features:
    • Standard IC698 module form factor
    • 4 LED status indicators (one per channel)
    • Screw terminals or D-sub for encoder connections
    • DIN-rail or chassis mount
  • Working Principle:
    • Encoder A/B signals are fed into high-speed RS-422 receivers. An internal FPGA/ASIC decodes the quadrature signals, determining direction and accumulating counts in 32-bit registers. The Z (index) pulse resets or latches the counter. The CPU reads counter values via the 90-70 backplane bus. Hardware counting ensures zero missed counts even at 5 MHz.
  • Installation Requirements:
    • Mount in IC698 chassis (90-70 compatible)
    • Use shielded twisted-pair cable for encoder connections
    • Ground shield at one end only (chassis ground)
    • Set input type (differential/single-ended) via DIP switches or software
    • Keep encoder cables away from power cables (>30cm separation)
  • Usage Precautions:
    • Do not exceed 5V on single-ended inputs — will damage receivers
    • Use differential mode for noisy environments (always preferred)
    • Do not exceed 5 MHz frequency — use appropriate prescaler if needed
    • Verify encoder signal voltage matches module specification
    • Add external pull-up resistors only if required by encoder type
    • Do not hot-swap — power down before installation

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