NI cFP-CTR-502 8-Channel Counter Input Module

The cFP-CTR-502 is an 8-channel counter input module for the Compact FieldPoint system, engineered for precise event, frequency, and position measurement in industrial and laboratory environments. It delivers 16-bit counter resolution per channel with cascadable architecture supporting up to 128-bit wide counters capable of storing trillions of counts. The module integrates 4 gate input channels and 4 configurable digital output channels, all supported by optically isolated inputs with 2,300 Vrms transient overvoltage protection. Software-selectable low-pass filtering (50 kHz or 200 Hz) on count-input channels suppresses high-frequency noise while accommodating input signals up to 50 kHz maximum frequency. Gate inputs enable counting control—active when high, disabled when low. Digital outputs function as generic outputs or automatic external-device controllers with 1 A maximum load per channel. The module accepts 5 VDC to 30 VDC sourcing inputs, compatible with TTL and industrial control devices. Internal frequency references of 1 kHz and 32 kHz support timing applications. Terminal count is user-configurable with a default rollover value of 65,535 counts. Input and output terminals provide direct power distribution to field devices via VSUP and COM connections. An external 5–30 VDC power supply drives all input channels and field loads. Status monitoring via LED indicators ensures operational visibility.

– Technical Specifications

• 8 counter input channels, 4 gate input channels, 4 digital output channels
• 16-bit counter resolution per channel; cascadable to 128-bit width
• Input voltage range: 5 VDC to 30 VDC sourcing
• Maximum input frequency: 50 kHz
• Internal frequency references: 1 kHz and 32 kHz
• Configurable digital filtering: 50 kHz or 200 Hz low-pass
• Transient overvoltage protection: 2,300 Vrms
• Digital output maximum load: 1 A per channel
• External power supply requirement: 5–30 VDC

– Key Features

• Cascadable counter architecture for extended bit width and count capacity
• Optically isolated inputs with current-limiting circuitry
• Configurable gate inputs for counting enable/disable control
• Sinking output topology compatible with sourcing-input devices
• Programmable terminal count with default 65,535 rollover
• Integrated LED status indicators

– Typical Applications

• Industrial event counting and frequency measurement
• Laboratory timing and position sensing
• Gate-controlled pulse accumulation
• External device automation via digital outputs

– Compatibility & Integration

• Compact FieldPoint backplane system integration
• TTL device compatibility
• 5, 12, and 24 VDC industrial control signal support
• Field device power distribution via integral VSUP and COM terminals