Description

Yokogawa CP703 Field Control Station (FCS)

The Yokogawa CP703, also cataloged as the CP701 Field Control Station, operates as a dedicated hardware component for executing control logic and managing analog/digital I/O within CENTUM CS 1000 systems. It handles data acquisition, signal processing, and real-time communication with Human Interface Stations (HIS) via VLnet.

Hardware Specifications

Parameter	Specification
Model Brand	Yokogawa CP703
Core Processor	R4300 Microprocessor
Internal Clock	75 MHz
External Clock	25 MHz
Memory	16 MB DRAM
Communication	VLnet, RS-232C
I/O Controller	H8S Microcontroller with Shared RAM
Redundancy Support	Dual-redundant configuration (bumpless transfer)
Status Indicators	Front-panel LEDs
Operating Temp	0 to 55 degC (standard industrial)
Power Consumption	10-15 W (typical, depending on configuration)
Weight	700 g
Dimensions	Standard FCS module form factor
Origin	Japan

Process Control Features

The CP703 supports channel-to-channel isolation to minimize cross-channel interference, ensuring accurate analog and digital signal processing. FOUNDATION Fieldbus and 4-20 mA HART loop protocols are supported for real-time process communication. Cold junction compensation (CJC) is implemented to correct thermocouple input errors across varying ambient temperatures.

Frequently Asked Questions

Q: Does the CP703 support hot-swapping of CPU modules?
A: CPU modules are not designed for hot-swap; replacement requires a controlled shutdown or redundant module failover.

Q: What is the expected switchover delay in a dual-redundant configuration?
A: The failover time is near instantaneous (<100 ms) under normal operating conditions, maintaining continuous control output.

Q: Can firmware upgrades be applied directly on the CP703 module?
A: Firmware must be updated using Yokogawa’s supported software interface via VLnet or HIS connection; direct module flashing is not supported.

Field Installation Guidelines

• Mount modules on standard Yokogawa FCS rack slots, ensuring proper orientation.
• Ensure the VLnet communication cable is shielded and grounded to reduce EMI.
• Maintain minimum spacing between modules to allow adequate airflow and heat dissipation.
• Connect power and I/O lines according to the system’s wiring diagram; verify signal grounding continuity.
• Follow ESD precautions when handling CPU and memory modules to prevent damage.

Specifications

• Brand: Yokogawa

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems