PLCs, Power Supplies & Others

Core Processing Capabilities

This processor module serves as the central intelligence unit for distributed control systems. It executes complex regulatory control, sequential logic, and data acquisition tasks efficiently. You can deploy this module in continuous process industries like chemical and petrochemical plants. The CPU handles multiple control loops with deterministic scan cycle performance. It coordinates I/O scanning and communication activities across the entire system. This processing power supports critical applications requiring high availability and fast response.

Physical Dimensions and Rack Mounting

The Yokogawa CP345 measures 250.0 mm in height and 45.0 mm in width. Its depth reaches 180.0 mm from the front panel to the rear connector. This unit weighs approximately 1.60 kg, requiring careful handling during installation. You can slide this module into any standard Yokogawa chassis slot. Two locking ejector handles secure the unit firmly in its position. The aluminum housing provides effective heat dissipation and electromagnetic shielding.

Processor Architecture and Execution Speed

This module incorporates a 32-bit RISC processor operating at 100 MHz core frequency. It executes user programs with a typical scan time of 5 milliseconds per 1,000 steps. The Yokogawa CP345 supports floating-point arithmetic and advanced PID algorithms natively. It processes both ladder logic and structured text programming languages. The CPU includes a hardware watchdog timer for automatic fault recovery. This performance ensures precise control in time-critical loop applications.

Memory Resources and Storage Allocation

The module provides 4 MB of flash memory for firmware and application program storage. It also includes 2 MB of battery-backed SRAM for process data and historical logs. The Yokogawa CP345 offers an additional 128 KB of EEPROM for system configuration parameters. You can allocate the SRAM into user-defined data tables and trend buffers. The flash memory supports firmware updates without replacing the hardware. The battery maintains data integrity during extended power outages.

Communication Interfaces and Field Connectivity

This processor includes two independent RS-485 ports for I/O bus communication. It also features one Ethernet port supporting Modbus TCP and proprietary protocols. The Yokogawa CP345 provides a dedicated RS-232 port for programming and diagnostics. You can connect operator interface panels through the secondary serial channel. The Ethernet port supports automatic negotiation for 10/100 Mbps operation. These interfaces enable seamless integration with existing plant networks.

Internal Component Architecture

The main logic board contains over 200 discrete components on a multi-layer PCB. You will find a high-performance voltage regulator for stable power distribution. The Yokogawa CP345 uses a quartz crystal oscillator with ±30 ppm frequency stability. A dedicated communication controller manages the I/O bus traffic efficiently. The board includes transient suppression diodes on all external ports. The component selection emphasizes long-term reliability in continuous operation environments.

Power Specifications and Energy Backup

This processor module draws 620 mA from a 5 VDC backplane supply. It consumes an additional 150 mA from the 24 VDC field power rail. An internal 3.3 V lithium battery provides backup for the SRAM and real-time clock. This battery offers a service life exceeding 5 years under normal operating conditions. The module also uses a 0.5 F supercapacitor for short-term memory retention. This supercapacitor maintains data for 72 hours during battery replacement.

Environmental Ratings and Certifications

The Yokogawa CP345 operates effectively between 0°C and 60°C ambient temperature. It tolerates humidity levels from 10% to 90% without condensation effects. The enclosure meets IP20 protection standards for control room installations. Vibration endurance reaches 2 G from 10 Hz to 150 Hz on each axis. Shock resistance measures 15 G for 11 milliseconds half-sine pulses. These specifications suit applications in refining, power generation, and water treatment facilities.

Technical Data Summary

Diagnostic Features and Operator Interface

This processor includes a front-panel LCD display for real-time system status. A six-button keypad allows you to navigate diagnostic menus conveniently. The display shows CPU load, memory usage, and communication activity levels. Four multi-color LEDs provide quick visual health indicators for the system. The module also supports remote diagnostics via the Ethernet interface.

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