CP703

The Yokogawa CP703 is a Field Control CPU module classified as a control module. It is identified as Style S1 and includes LED indicators for visual status monitoring. With a listed weight of 1.05 lbs (approximately 0.48 kg), the module can be identified by its CP703 model designation and Style S1 configuration.

Functional Description

The CP703 serves as the processor card in a Yokogawa Field Control Station (FCS). It performs control computations and processes data exchanged with the station's I/O modules. Its processor architecture supports input data handling, control execution, logic operations, and output processing.

Yokogawa technical documentation identifies the CP703 as the enhanced CPU card for the CENTUM CS 1000 platform, distinguishing it from the CP701 basic CPU card.

Processor Architecture

The documented CP703 CPU architecture includes:

• R4300 microprocessor: Main processing unit for FCS control operations.
• 16 MB memory: Enhanced-system memory capacity with error-correction code (ECC).
• 75 MHz internal clock: Processor internal operating clock.
• 25 MHz external clock: External processor clock.
• Flash memory: Stores the boot program.
• LED indicators: Provide visual indications for module status monitoring.

The CPU card uses an H8S microcontroller to access I/O module data and status information through shared RAM, reducing the main processor's workload.

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Technical Specifications

Parameter	Specification
Model	CP703
Brand	Yokogawa
Product Type	Field Control CPU Module
Module Configuration	Style S1
Processor	R4300
Memory Capacity	16 MB
Internal Clock	75 MHz
External Clock	25 MHz
Memory Protection	ECC
Boot Program Storage	Flash Memory
Status Indicators	LED Indicators
Weight	1.05 lbs

Frequently Asked Questions

Q: What is the difference between the Yokogawa CP703 and CP701?

A: Both are CPU cards for the CENTUM CS 1000 Field Control Station. The CP703 is the enhanced-system model with 16 MB memory, while the CP701 is the basic-system model with 8 MB memory. The appropriate model depends on the installed system software.

Q: What is the purpose of the LED indicators on the CP703?

A: The LEDs provide visual status indications for maintenance and operational checks. The exact meaning of each indicator should be verified against the applicable module documentation.

Q: Does the CP703 support redundant CPU operation?

A: Yokogawa documents a synchronous hot-standby CPU architecture for the CENTUM CS 1000. However, redundant operation requires an appropriately configured FCS with the necessary hardware. A single CP703 module does not independently establish a redundant configuration.

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