CCC IOC-555-D (Part No.17-550555-001) is a simplex I/O card developed by Compressor Controls Corporation (CCC, USA). As a core expansion module for the IOC-555 series programmable controllers, it is optimized for the regulation and protection of industrial compressor systems. Widely compatible with distributed control systems (DCS) in oil & gas, petrochemical and general industrial sectors, it delivers reliable field signal acquisition and equipment control functions.
Product Advantages
Excellent Compatibility: Natively compatible with all CCC IOC-555 series controllers, plug-and-play without extra protocol configuration.
Industrial-Grade Reliability: Designed for 24 VDC wide voltage input and superior EMI immunity, suitable for harsh environments with high temperature and dust; capable of 24/7 uninterrupted operation.
High Integration & Cost Efficiency: Each card integrates 8 digital inputs plus 8 digital outputs with built-in RS‑485 communication. It replaces multi-card combinations to cut hardware and maintenance expenses.
Easy Installation & Maintenance: Standard card form factor for DIN rail mounting. Front-panel HEALTH/ALARM/POWER LED indicators enable visual fault indication and rapid troubleshooting.
Stable Real-Time Communication: RS‑485 port supports long-distance transmission to realize low-latency and dependable data exchange between controllers and field devices.
Product Specifications
1. Core Hardware Parameters
Model: IOC-555-D (Part No.: 17-550555-001)I/O Configuration: 8 digital inputs (DI) + 8 digital outputs (DO)Communication Port: RS-485 (standard industrial serial communication)Operating Voltage: 24 VDC (±10%)Dimensions: Approx. 230 mm×150 mm×60 mmWeight: Approx. 0.8 kgMounting: DIN rail mounting / cabinet slot mountingLED Indicators: HEALTH, ALARM, POWER, CONTROL
2. Functional Features
Digital Input: Receives on/off signals from switches and sensors to monitor equipment status such as compressor start/stop and valve position.Digital Output: Drives relays, solenoid valves and contactors to execute control commands including compressor load/unload and alarm lamp activation.Built-in Self-Diagnosis: Equipped with watchdog timer for automatic reset upon abnormality; front LEDs continuously indicate power, communication and operational status.Simplex Communication: Unidirectional data transmission. It focuses on command issuing from controller to field devices, eliminates interference from bidirectional communication and guarantees control priority.
Application Scenarios
Oil & Gas Industry: Start-stop control, pressure/temperature status monitoring and unit protection interlock for natural gas compressors and oilfield gas injection compressors.
Petrochemical Industry: Operation control, anti-surge protection and valve interlock control for process compressors and refrigeration compressors.
Industrial Refrigeration & HVAC: Compressor speed regulation, defrost cycle management and fan control for large cold storage and central air-conditioning systems.
General Industrial Automation: Signal acquisition and control expansion for DCS systems, production line equipment interlock and motor start-stop control.
FAQ
- POWER indicator off after power-up?
- Verify normal 24 VDC supply and correct polarity wiring.
- Check for loose power terminals and retighten connections.
- If input power is normal, the onboard power circuit of the card is defective and card replacement is required.
- Flashing HEALTH LED and steady-on ALARM LED?
- Most commonly communication fault: Check RS‑485 wiring and eliminate conflicting communication addresses.
- Abnormal input signal: Inspect DI terminal wiring and verify faulty sensors or switches.
- Failed self-test: Power cycle the card; replace the card if the fault persists due to hardware damage.
- No response from digital outputs and failure to control field equipment?
- Check loose DO wiring and confirm healthy power supply for connected loads.
- Verify correct DO address setup and activated control logic inside the controller program.
- Measure output voltage at DO terminals; no voltage indicates damaged output channel on the card.
- Is communication available with non‑CCC controllers?
- Natively compatible only with CCC IOC‑555 series controllers.
- Third-party communication is achievable via an external RS‑485 to Modbus converter with additional configuration.
- Operating ambient temperature range?
- Standard range: 0°C ~ 55°C.
- Extended harsh range: -20°C ~ 70°C with derated load capacity.
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