GE Fanuc IC698CHS117C High-Speed Counter Module

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Product Overview:
The GE Fanuc IC698CHS117C is a 4-channel high-speed counter and frequency measurement module belonging to the Genius I/O product family for the Series 90-70 PLC. This module provides 32-bit counting resolution on each of its four independent channels, supporting encoder signals, tachometer inputs, and event counting at speeds up to 5 MHz. It is the preferred module for closed-loop speed control, precision position tracking, flow metering, and web handling applications where millisecond-level response is critical.

Technical Specifications:
Series: GE Fanuc 90-70 Genius I/O
Number of Channels: 4 independent 32-bit counter/frequency channels
Maximum Counting Frequency: 5 MHz per channel
Input Signal Types: A/B quadrature encoder, single pulse + direction, up/down counting
Input Voltage Levels: 5V TTL or 24V DC (Software configurable via jumpers)
Counter Resolution: 32-bit (Range: 0 to 4,294,967,295)
Backplane Bus: VMEbus
Operating Temperature: 0°C to +60°C (32°F to 140°F)
Isolation Voltage: Channel-to-channel > 500V DC, Channel-to-backplane > 500V DC
MTBF: > 150,000 hours

Functional Features:
4 Independent Channels: Each channel operates completely independently, allowing simultaneous counting of four different encoder signals without crosstalk.
32-Bit Accumulative Counting: Supports forward counting, reverse counting, and forward/reverse counting with a range exceeding 4.2 billion pulses.
High-Precision Frequency Measurement: Measures input frequency with 0.1Hz resolution, ideal for tachometer and flowmeter applications.
Gate Function: Supports external gate signals, enabling counting only during a defined time window.
Preset Value Comparison: Triggers an interrupt to the CPU when the count matches a user-defined preset value.
Non-Volatile Retention: Count values are stored in battery-backed RAM, ensuring zero data loss during power failures.
Programmable Digital Filter: Configurable input filter from 0.1μs to 10ms to eliminate contact bounce and noise.

Performance Parameters:
Counting Accuracy: ±1 pulse at 5 MHz frequency
Response Latency: < 1μs from input edge to count update
Input Filter Range: 0.1μs to 10ms (Software programmable)
ESD Protection: ±15kV air discharge on all inputs
Signal-to-Noise Ratio: > 60dB

Material Composition:
Enclosure: Die-cast aluminum with anodized finish for EMI shielding
PCB: 6-layer FR-4 high-Tg board with controlled impedance traces
Connectors: High-density D-Sub connectors with gold-plated pins
Optocouplers: High-speed digital isolation optocouplers with propagation delay < 50ns
FPGA: Xilinx or Altera FPGA for real-time counting logic