GE 8937-HN High-Speed Counter / Motion Module

Product Brief Introduction: The GE 8937-HN is a specialized high-speed counter or motion control module for GE PACSystems or Series 90-30 platforms. It handles fast pulse inputs from encoders or tachometers, enabling precise speed, position, or counting applications beyond standard PLC scan capabilities.
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Technical Specifications:
Input Type: Quadrature encoder, pulse/direction
Max Frequency: Up to 1 MHz
Channels: 1 or 2 independent axes
Resolution: 32-bit counter
Output: Cam, compare, or PWM outputs
Power: Backplane + field power
Operating Temp: 0°C to 60°C
Certifications: UL, CE
Functional Features:
Hardware-based counting unaffected by PLC scan time.
Programmable cam outputs for mechanical synchronization.
Position comparison with latch function.
Encoder break detection and loss-of-signal alarm.
Configurable via software tool.
High noise immunity for encoder signals.
Application Scenarios:
Packaging machine registration control.
Web tension and length measurement.
Robot joint position feedback.
Conveyor speed monitoring.
Cut-to-length systems.
Performance Parameters:
Accuracy: ±1 count error max.
Response Time: Microsecond-level hardware response.
Update Rate: Real-time position/speed reporting.
Reliability: Solid-state design for long life.
Flexibility: Multiple operating modes supported.
Structural Characteristics:
Single-slot width module.
DB9 or terminal block for encoder.
Status LEDs for channel activity.
Locking tab for secure mounting.
Labeling area for axis ID.
Working Principle:
Receives quadrature pulses directly into hardware counter. Counts up/down based on phase relationship. Compares count to preset values and triggers outputs instantly. Sends processed data to CPU periodically for higher-level logic.
Installation Requirements:
Use shielded encoder cables with drain wire.
Ground shield at controller end only.
Verify encoder voltage matches module input rating.
Configure resolution and direction in software.
Secure cable connections to prevent vibration loosening.




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