ABB CP651
ABB CP651
ABB CP651
ABB CP651
ABB CP651

ABB CP651 | Procontic CP600 Series PLC CPU Module

  • Brand: ABB
  • Model: CP651
  • Product Type: PLC CPU Module
  • Series: Procontic CP600 Series (Compact PLC Family)
  • Core Function: Executes user-defined PLC programs, processes discrete/analog I/O data, and manages communication with field devices and supervisory systems; serves as the central processing unit for compact automation systems.
  • Key Specs: 32-bit RISC processor, 512KB user memory, supports up to 256 I/O points, integrated RS-232/RS-485 and Ethernet communication ports.
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Part number: ABB CP651
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Description

CP651: Product Overview
This component is a central processing unit (CPU) module within ABB’s Procontic CP600 Series, designed for small-to-medium industrial automation systems requiring compact, cost-effective programmable logic control. In a PLC architecture, it functions as the system brain, positioned in a compact control enclosure to execute ladder logic or function block programs, manage I/O module interactions, and coordinate communication with field devices (e.g., sensors, actuators) and supervisory systems (e.g., HMI, SCADA). Its role is to sample input signals, execute control algorithms in real time, update output states, and log diagnostic data—ensuring deterministic operation for discrete tasks (e.g., machine sequencing) and simple process control (e.g., temperature regulation).
The core functionality involves processing 24VDC discrete inputs (dry contact, transistor) and analog signals (4-20mA, 0-10V) via connected I/O modules, executing user programs stored in flash memory, and managing communication via integrated ports (RS-232/RS-485 for legacy devices, Ethernet for modern networks). It supports up to 256 I/O points (expandable via CP600 series expansion modules) and includes built-in diagnostics (e.g., program errors, I/O faults) for troubleshooting.
It belongs to the Procontic CP600 Series, a product family optimized for modularity, ease of programming, and compatibility with ABB’s legacy and current automation tools. The platform’s benefits include standardized DIN-rail mounting, seamless integration with ABB’s PG600 programming software (IEC 61131-3 compliant), and global certification (CE, UL) for cross-regional deployment. This ensures scalability from standalone machines to networked production cells without proprietary constraints.

ABB CP651

ABB CP651

CP651: Technical Specifications
  • Model Number: CP651
  • Manufacturer: ABB
  • Product Type: PLC CPU Module
  • Processor: 32-bit RISC (50 MHz clock speed)
  • User Memory: 512KB flash (program storage), 64KB RAM (data storage)
  • I/O Capacity: Up to 256 points (via CP600 series digital/analog I/O modules)
  • Communication Ports: 1x RS-232 (programming/diagnostics), 1x RS-485 (Modbus RTU), 1x 10/100Mbps Ethernet (TCP/IP, Modbus TCP)
  • Programming Software: ABB PG600 (compatible with IEC 61131-3 languages: LD, FBD, ST)
  • Power Supply: 24V DC (±10% tolerance, 150mA typical consumption)
  • Operating Temperature: 0°C to +55°C
  • Storage Temperature: -25°C to +70°C
  • Protection Rating: IP20 (panel-mount, finger-safe terminals)
  • Dimensions: 90mm x 100mm x 75mm (WxHxD, DIN-rail mountable)
  • Weight: 0.3kg
Core Features & Customer Value​
The module’s design prioritizes compactness, programming efficiency, and operational flexibility. The 32-bit RISC processor ensures fast scan times (≤10ms for 1000 instructions), critical for time-sensitive applications like packaging machine sequencing, where delayed outputs cause product jams. For engineers, this responsiveness reduces cycle time variability, improving throughput.
Integrated communication ports eliminate the need for separate protocol converters: RS-485 supports legacy Modbus RTU devices (e.g., old drives), while Ethernet enables connectivity to modern HMI panels or SCADA systems via Modbus TCP. This versatility simplifies system integration, especially in brownfield facilities upgrading incrementally. The 512KB flash memory accommodates moderately complex programs (e.g., 500-1000 ladder rungs), reducing the need for higher-cost CPUs in small production lines.
PG600 programming software aligns with IEC 61131-3 standards, allowing engineers familiar with other PLC platforms (e.g., Siemens, Rockwell) to adapt quickly. Built-in diagnostics (e.g., program syntax errors, I/O module status) display via the software’s interface, cutting troubleshooting time by 25% compared to code-only debugging. Modular expandability (up to 256 I/O points) lets users start with a base configuration and add modules as process demands grow—avoiding upfront overprovisioning.

ABB CP651

ABB CP651

Typical Applications​
In a standalone bottling machine, the module controls 32 digital inputs (bottle presence sensors, cap tightness detectors) and 16 digital outputs (pneumatic actuators for filling/closing). Its 10ms scan time ensures precise actuator timing, while Ethernet connectivity links to an HMI for operator setpoint adjustment. Diagnostics alert technicians to a stuck bottle sensor (input fault) before production halts.
At a municipal water pump station, it manages 8 analog inputs (pressure/level sensors) and 4 digital outputs (pump starters). RS-485 Modbus RTU communicates with legacy pump controllers, and the 0°C to +55°C rating withstands unheated control panels. Program logic adjusts pump cycles based on level feedback, reducing energy use by 15%.
In a small assembly cell, the module coordinates 24VDC actuators (part pickers, screwdrivers) and interfaces with a barcode scanner via Ethernet. PG600 software simplifies logic updates when adding new part types, and modular I/O expansion supports future sensor additions without replacing the CPU.

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