1. Product Overview

Product Name: Isolated Counter Module
Model: CNT24‑2(FIT)GY
Series: F&eIT Series (Factory and Enterprise Information Technology)
Article Number: CNT24‑2(FIT)
Manufacturer: CONTEC CO., LTD., Osaka, Japan

The CONTEC CNT24‑2(FIT)GY is a compact, Ethernet‑integrated, isolated 24‑bit up/down counter module designed for high‑speed pulse counting and position control applications in distributed industrial automation systems. It is part of CONTEC’s F&eIT modular I/O family, which provides Ethernet‑based distributed monitoring and control solutions for factory and enterprise integration. The module is DIN‑rail mountable, stack‑connectable, and compatible with multiple controller types, including Micro Controller Units (CPU‑SBxx(FIT)GY), I/O Controller Modules (CPU‑CAxx(FIT)GY), and Monitoring & Control Servers (SVR‑MMF(FIT)GY).

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2. Key Features

- Dual‑channel 24‑bit up/down counter: Two independent counting channels supporting 24‑bit resolution for precise pulse measurement and position tracking.
- High‑speed operation: Supports input frequencies up to 500 kHz (duty 50%) for high‑speed encoder or pulse input applications.
- Opto‑isolated inputs and outputs: Ensures electrical isolation between external signals and internal logic, improving noise immunity and protecting the controller.
- Flexible counting modes: Supports 1‑phase, 2‑phase (quadrature), and 1‑phase with gate control modes, with selectable multiplication (×1, ×2, ×4).
- Programmable digital filter: Adjustable from 0.1 µs to 1056.1 µs to suppress noise and signal chatter.
- Programmable timer: 1 ms to 200 s range for timed operations and interrupt generation.
- One‑shot pulse output: Generates a programmable pulse (0–104.45 ms) upon count match for external device triggering.
- Interrupt and sense functions: Supports IRQ5, IRQ7, or IRQ9 interrupt levels for event‑driven control.
- Compact DIN‑rail design: 25.2 (W) × 64.7 (D) × 94.0 (H) mm, 100 g, with tool‑less spring connectors for easy wiring.
- Device ID rotary switch: Allows up to eight modules (IDs 0–7) per controller stack.
- Wide compatibility: Operates with CONTEC’s Ethernet and USB controllers and servers, enabling integration into distributed I/O networks.
- Software support: Fully supported by CONTEC’s Windows driver libraries (API‑SBP(W32), API‑CAP(W32), API‑USBP(WDM)) and F&eIT protocol for networked control.

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3. Technical Specifications

| Parameter | Specification |
|----------------|-------------------|
| Channels | 2 independent up/down counters |
| Counting System | 24‑bit binary up/down |
| Maximum Count Value | FFFFFFh (16,777,215 decimal) |
| Input Type | Opto‑isolated (current sinking output compatible) |
| Input Signals | Phase A/UP, Phase B/DOWN, Phase Z/CLR, General‑purpose input |
| Input Resistance | ≥ 220 Ω |
| Input ON Current | 15 – 25 mA |
| Response Frequency | 500 kHz (max., duty 50%) |
| External Circuit Power Supply | 5 – 12 V DC ± 10%, 400 mA (min.) |
| Digital Filter Range | 0.1 µs – 1056.1 µs (programmable) |
| Programmable Timer | 1 ms – 200 s |
| Interrupt Levels | IRQ5, IRQ7, IRQ9 (programmable) |
| Output Channels | 2 (one per counter channel) |
| Output Type | Opto‑isolated open collector (current sink, negative logic) |
| Rated Output | 35 V DC, 50 mA (max.) |
| Pulse Width Range | 0 – 104.45 ms (programmable) |
| Internal Power Consumption | 5 V DC ± 5%, 150 mA (max.) |
| Signal Cable Length | Up to 30 m |
| Dimensions | 25.2 (W) × 64.7 (D) × 94.0 (H) mm (excluding protrusions) |
| Weight | 100 g |
| Mounting | 35 mm DIN rail (one‑touch mechanism) |
| Wiring | AWG 28 – 20, spring‑clamp connector (Phoenix Contact FK‑MC 0.5/9‑ST‑2.5) |
| Operating Temperature | 0 – 50 °C |
| Storage Temperature | −10 – 60 °C |
| Operating Humidity | 10 – 90 % RH (no condensation) |
| Noise Resistance | AC line 2 kV, signal line 1 kV (IEC1000‑4‑4 Level 3 / EN61000‑4‑4 Level 3) |
| Vibration Resistance | 10–57 Hz 0.15 mm, 57–150 Hz 2 G, 80 min each axis |
| Impact Resistance | 15 G, 11 ms half‑sine shock (X/Y/Z) |
| Compliance | FCC Class A, CE (industrial use) |

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4. Functionality

The CNT24‑2(FIT)GY functions as a high‑speed pulse counter for position, speed, or event counting applications. It can process encoder signals, pulse trains, or discrete inputs and communicate results to a host controller via the F&eIT bus or Ethernet network.

Operating Modes:
- 2‑phase quadrature input: Counts up/down based on phase A/B transitions; supports ×1, ×2, ×4 multiplication.
- 1‑phase input: Counts up or down based on single pulse input.
- 1‑phase with gate control: Enables/disables counting via a gate signal.
- Synchronous/asynchronous clear: Counter reset synchronized with Z‑phase or independent of it.
- Programmable direction: Selectable clockwise/counterclockwise or up/down logic.

Use Cases:
- Rotary encoder position feedback
- Linear scale measurement
- Motor speed or revolution counting
- Production line part counting
- Event timing and synchronization

Compatibility:
- Micro Controller Units: CPU‑SB10/20/21(FIT)GY
- I/O Controllers: CPU‑CA10/20(FIT)GY (Ethernet)
- Monitoring & Control Servers: SVR‑MMF(FIT)GY
- I/O Assist Servers: SVR‑IOA(FIT)GY
- USB Controllers: CPU‑CA10(USB)GY

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5. Components & Accessories

Included Items:
- CNT24‑2(FIT)GY module (1 unit)
- Interface connector plugs (2 pcs, Phoenix Contact FK‑MC 0.5/9‑ST‑2.5)
- CD‑ROM (F&eIT Series Setup Disk – drivers and manuals)
- First Step Guide (User documentation)

Optional Accessories:
- Power Supplies: POW‑AD13GY, POW‑AD22GY, POW‑AD25GY (AC‑DC); POW‑DD10GY, POW‑DD43GY (DC‑DC)
- Cooling Fan: FAN‑FIT (optional, extends operating temperature to 60 °C)
- DIN‑rail mounting hardware: standard 35 mm rail compatible
- Development Software: API‑SBP(W32), API‑CAP(W32), API‑USBP(WDM) driver libraries

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6. Installation & Setup

- Mounting: Snap‑on installation to a 35 mm DIN rail using the integrated latch mechanism. Removal is tool‑free.
- Stack Connection: Modules interconnect laterally via the F&eIT bus connector with a safety lock—no backplane required.
- Device ID Setting: Rotary switch (0–7) on the front panel assigns a unique ID for each module in a stack.
- Wiring: Use the supplied spring‑clamp connectors; strip 7–8 mm of insulation; insert wire while pressing the orange release button.
- External Power: 5–12 V DC ± 10% (400 mA min.) for input circuits and output loads.
- Surge Protection: Add diodes or zener diodes across inductive loads (relays, solenoids) to suppress voltage spikes.
- Connection Examples:
- Rotary encoder (A/B/Z phases)
- Pulse generator or sensor input
- External load driven by one‑shot pulse output

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7. Performance & Capabilities

- Counting Performance:
- 24‑bit resolution per channel
- 500 kHz max input frequency
- 0.1 µs minimum pulse width
- ±1 count accuracy within specified frequency range

- Digital Filtering:
- 16 selectable filter clock cycles (0.1 µs to 1056.1 µs)
- Eliminates chatter and noise on A/B/Z inputs

- Timer & Interrupts:
- Programmable timer (1 ms – 200 s) for periodic interrupts
- Interrupt mask and sense registers for event management
- Supports IRQ5/7/9 hardware interrupts

- Output Control:
- One‑shot pulse width programmable (0 – 104.45 ms)
- 35 V DC, 50 mA (max.) sink output per channel

- Reliability & Noise Immunity:
- Opto‑isolation on all I/O lines
- IEC1000‑4‑4 Level 3 noise resistance
- FCC Class A industrial EMC compliance

- Limitations:
- Some functions (timer, interrupts) available only with CPU‑SBxx controllers
- Not supported on USB controller CPU‑CA10(USB)GY for output pulse functions

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8. Standards & Compliance

- EMC: FCC Part 15 Class A (industrial use)
- CE Marking: Complies with EN61000‑4‑4 Level 3 (electrical fast transient immunity)
- Safety Ground: D‑type (Former Class 3) grounding recommended
- Environmental Standards: RoHS compliant materials, lead‑free construction
- Quality Assurance: Manufactured under CONTEC’s ISO 9001 certified processes

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9. Additional Information

Warranty:
One‑year limited warranty from date of purchase against defects in materials and workmanship. Free repair or replacement within warranty period when returned with RMA authorization. Warranty excludes damage from misuse, modification, or abuse.

Support & Service:
Technical support and software updates available via CONTEC’s global web portals:
- Japan: [www.contec.co.jp](http://www.contec.co.jp)
- Global: [www.contec.com](http://www.contec.com)
- USA: [www.contecusa.com](http://www.contecusa.com)
- Europe: [www.contec-europe.com](http://www.contec-europe.com)
- China: [www.contec.com.cn](http://www.contec.com.cn)

Maintenance:
- Avoid operation in environments with excessive dust, humidity, or vibration.
- Do not open the module housing; internal repairs should be performed by CONTEC.
- Inspect wiring and connectors periodically for secure fit and clean contacts.
- Replace modules if exposed to electrical surge beyond rated limits.

Software and Firmware Updates:
Driver libraries (API‑SBP(W32), API‑CAP(W32), API‑USBP(WDM)) and diagnostic utilities are available for download from CONTEC’s website. Firmware updates can be applied via the F&eIT setup utility over Ethernet.

Development Environment:
- Supported OS: Windows XP/2000/NT4.0/Me/98/95, Linux 2.2/2.4 kernel
- Programming Languages: Visual C++, Visual Basic, Delphi, C++ Builder
- API Compatibility: Compatible with CONTEC PCI bus boards (API‑PAC(W32))
- Diagnostics: Built‑in monitor for module status and I/O verification

Safety and Handling Precautions:
- Operate within specified temperature and humidity ranges.
- Avoid exposure to corrosive gases or strong magnetic fields.
- Turn off controller power before connecting or disconnecting modules.
- Use proper grounding to prevent electrostatic discharge damage.
- Provide surge suppression for inductive loads (relays, motors).

Physical Design:
- Front‑mounted connectors for easy access and maintenance.
- LED indicators for each input (A/B/Z/DI) show signal status in real time.
- Rotary Device ID switch and status LEDs simplify system configuration.

Environmental Reliability:
- Tested for industrial vibration and shock resistance (JIS C0040 / IEC68‑2‑6 and ‑27).
- Fanless, maintenance‑free design for continuous operation in industrial environments.

Integration in F&eIT Systems:
The CNT24‑2(FIT)GY operates as a device module within CONTEC’s distributed Ethernet I/O architecture. It communicates with controllers via the F&eIT bus and F&eIT protocol (UDP/IP with response confirmation), ensuring high‑speed and reliable data exchange for real‑time industrial applications. Modules can be monitored and controlled remotely through web‑based interfaces provided by I/O Assist and Monitoring & Control Servers.

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Summary

The CONTEC CNT24‑2(FIT)GY is a robust, high‑precision 24‑bit dual‑channel counter module engineered for industrial automation and measurement applications. Its combination of high‑speed counting, optical isolation, programmable filtering, and network integration makes it ideal for encoder feedback, motion control, and process monitoring tasks. As part of the F&eIT Series, it offers seamless Ethernet connectivity, modular expandability, and cross‑platform software support, delivering a compact and reliable solution for distributed industrial systems.