Omron CJ1G-CPU45H Loop-Control CPU Unit for CJ-Series PLC Systems
The Omron CJ1G-CPU45H is a high-performance loop-control CPU unit for the SYSMAC CJ-series programmable logic controller systems. This advanced CPU is specifically designed for applications requiring extensive I/O capacity, complex control logic, and integrated loop control capabilities. The CJ1G-CPU45H features an I/O capacity of 1,280 points, a program capacity of 60,000 steps, and a data memory capacity of 128,000 words, making it suitable for demanding automation applications in manufacturing, process control, and machine automation where extensive I/O and complex control algorithms are required.
Key Specifications
Model: CJ1G-CPU45H Loop-Control CPU Unit
Product Series: SYSMAC CJ-series
I/O Capacity: 1,280 points
Maximum Mountable Units: 40 units
Program Capacity: 60K steps (60,000 steps)
Data Memory Capacity: 128K words (DM: 32K words, EM: 32K words × 1 bank)
LD Instruction Execution Time: 0.04 μs
Function Block Memory: 1024 KB (FB program memory)
Maximum Function Block Definitions: 1024
Maximum Function Block Instances: 2048
Expansion Racks: Up to 3 racks maximum
Current Consumption: 0.91 A at 5V DC
Weight: Approximately 0.62 kg
Operating Temperature: 0°C to 55°C
High-Capacity I/O Configuration
The CJ1G-CPU45H supports a maximum of 1,280 I/O points, providing extensive capacity for large-scale automation applications. The CPU can accommodate up to 40 units total on the CPU rack and expansion racks combined, with a maximum of 3 expansion racks. This high I/O capacity allows the CPU to serve as the central controller for systems with numerous sensors, actuators, and field devices. The flexible configuration supports mixing of basic I/O units, special I/O units, and CPU bus units, allowing users to customize the system precisely for their application requirements.
Fast Processing Performance
The CJ1G-CPU45H delivers exceptional processing speed with an LD instruction execution time of 0.04 μs and a common processing time of 0.3 ms. This high-speed processing enables the CPU to handle large ladder logic programs, complex function blocks, and high-speed I/O updates without scan time constraints. The fast execution speed is particularly valuable for applications requiring rapid response to input changes, such as high-speed packaging machinery, assembly equipment, and motion control systems. The processing power provides headroom for future expansion and additional functionality without hardware upgrades.
Function Block Programming Support
The CJ1G-CPU45H includes extensive function block programming support, enabling structured, reusable code for complex control applications. The CPU provides 1024 KB of function block program memory, supporting up to 1024 function block definitions and 2048 function block instances. Function blocks encapsulate control logic into reusable components, simplifying program development, reducing coding errors, and improving code maintainability. This structured programming approach is particularly valuable for applications with repetitive control patterns, such as multi-zone temperature control, multi-axis positioning, and modular machine control.
Data Memory Architecture
The CPU provides 128K words of total data memory, organized as 32K words of DM (Data Memory) and 32K words of EM (Extended Memory) across 1 bank. This generous data memory capacity supports storage of process variables, recipe data, production counters, and other information required for complex control applications. The memory architecture supports efficient data handling for applications requiring data logging, recipe management, and process variable storage. The non-volatile memory retains critical data during power interruptions, eliminating the need for reprogramming after power cycles.
Loop-Control Functionality
The CJ1G-CPU45H is specifically designated as a loop-control CPU, indicating enhanced capabilities for process control applications requiring PID regulation. The CPU can execute PID control loops for maintaining temperature, pressure, flow, and other process variables at setpoints. The loop-control functionality is integrated with the analog I/O capabilities of the CJ-series, allowing the CPU to read analog inputs, execute PID algorithms, and write analog outputs for process regulation. This integrated approach eliminates the need for external loop controllers in many applications, reducing system complexity and cost.
SYSMAC CJ-Series System Architecture
The CJ1G-CPU45H is built on the SYSMAC CJ-series platform, Omron's modular PLC system designed for machine automation and process control applications. The CJ-series offers a wide range of CPU units, I/O modules, communication units, and special function modules, allowing users to configure controllers precisely for their application requirements. The platform supports a maximum of 40 units per system when using appropriate power supply units, providing scalability from small standalone machines to larger distributed systems. The common programming environment across the CJ-series simplifies engineering and training.
Built-in RS-232C Communication
The CPU includes a built-in RS-232C serial port for connection to programming devices, HMIs, and other serial equipment. The serial port supports Host Link protocol for communication with host computers and other Omron devices. The communication capability enables program upload/download, data exchange with HMIs, and connection to serial peripherals such as barcode readers and printers. For network communication, the CPU can be equipped with optional Ethernet, Controller Link, or DeviceNet units to integrate into plant-wide automation networks.
Industrial Applications
The Omron CJ1G-CPU45H CPU unit is deployed across a wide range of industrial automation applications requiring high I/O capacity and complex control logic. In manufacturing, it controls assembly lines, packaging machinery, and material handling systems. In process control, it manages batch processes, temperature regulation, and flow control. In machine automation, it coordinates multi-axis motion control, robotics, and inspection equipment. The CPU's combination of high I/O capacity, fast processing speed, and function block support makes it suitable for demanding applications in automotive, food and beverage, pharmaceutical, and general manufacturing industries.
Conclusion
The Omron CJ1G-CPU45H loop-control CPU unit provides high-capacity I/O with 1,280 points, fast processing with 60K steps program memory, and extensive function block support for CJ-series PLC systems. Its loop-control capabilities and scalable architecture make it a versatile solution for demanding industrial automation applications requiring complex control logic and extensive I/O capacity.
