YOKOGAWA CENTUM VP System FCS (Field Control Station)

2. I/O function

Process I/O: Interacting with field device data, including% Z (process I/O/fieldbus I/O),% WW/% WB (communication I/O)

Software I/O: FCS internal virtual data interaction, including:

Internal switches:% SW (common switch),% GS (global switch)

Message output:% AN (alarm message),% OG (operator guide message),% CP (upper computer event message)

3. Control the drawing and scanning cycle

Control drawing properties:

Visualize the connection between I/O and functional blocks, define execution priorities

Support mixed configuration of regulation control and sequence control

Function blocks that can be connected across different control drawings

Scanning cycle:

Basic scan: fixed for 1 second

Medium speed scanning: 200ms/500ms (default 500ms), some models do not support it

High speed scanning: 200ms/500ms (default 200ms), supports direct input of 50ms/100ms/250ms

Redundancy mechanism (dual redundant core design)

1. Redundant coverage range

Hardware redundancy: processor module, power module, Vnet/IP interface, ESB/ER bus, node interface module

Software redundancy: synchronous computing, data backup, seamless switching logic

2. Core redundancy technology (Pair and Spare)

Processor module: Each module contains 2 MPUs, which synchronously execute the same calculation and compare the results in real-time. If there is inconsistency, a switch will be triggered

Standby module: Real time synchronous active module calculation, ensuring seamless switching and no process interruption

Fault recovery: The fault module automatically self diagnoses, transient errors can be restored to standby state, and hardware faults support online replacement

Bus redundancy: The ESB/ER bus operates alternately in dual channels, automatically switches in case of failure, and undergoes regular testing to restore its state

Subsystem communication (supports 9 types of core communication)

Communication type adaptation equipment core purpose

Data exchange between FA-M3 communication Yokogawa FA-M3/FA500 controllers

Modbus Communication Yokogawa STARDOM, Schneider Modicon Universal Industrial Equipment Communication

MELSEC Communication Mitsubishi MELSEC Series PLC PLC and FCS Data Interaction

PLC-5/SLC 500 Communication Rockwell PLC-5/SLC 500 European and American PLC Integration

YS Communication Yokogawa YS100/YEWSERIES 80 Yokogawa Instrument Direct Connection

FF-H1 Communication FOUNDATION Fieldbus Device Fieldbus Device Integration

Key issue

Question 1: What is the core design of the dual redundancy architecture for CENTUM VP FCS? How to achieve high availability of 99.99999%?

answer

Core redundancy design: Adopting the "Pair and Spare" technology, each processor module is equipped with 2 MPUs, which synchronously execute the same control calculations and compare the results in real time; A dual redundant configuration that covers all hardware aspects such as processors, power supplies, communication buses, and I/O modules simultaneously.

High availability implementation path:

Calculation verification: When the calculation results of MPU1 and MPU2 are inconsistent, it is judged as a "calculation exception", and the active processor module seamlessly switches to the standby module;

Seamless switching: The standby module synchronizes real-time active module data and computing status, with no process interruption during switching;

Fault self diagnosis: The fault module automatically detects the type of fault, and transient errors can be restored to standby state. Hardware faults support online replacement;

Bus redundancy: The ESB/ER bus operates alternately in dual channels, with regular testing of recovery capabilities and automatic switching in case of failure;

Hardware guarantee: ECC memory automatically corrects bit errors, WDT (watchdog timer) monitors software failures, further reducing the risk of failure.

Question 2: What flexibility does the control function of CENTUM VP FCS have? How to adapt to control requirements of different scales and types?

answer

The flexibility of control functions is reflected in three aspects:

Flexible combination of functional blocks: covering 5 categories of functional blocks including regulation control (PID, ONOFF, etc.), sequence control (ST16, LC64, etc.), calculation (ADD, CalcU, etc.), panel display, etc., supporting on-demand combination;

Control drawing features: Supports cross drawing function block connection, adjustment, and sequence control mixed configuration, and can define control logic according to process units;

Scanning cycle options: basic (1s), medium speed (200ms/500ms), high speed (200ms/500ms) scanning cycle, suitable for different response speed requirements.

Adaptation methods for different scenarios:

Small system: Choose compact FCS (such as FFCS, SFCS), paired with basic functional blocks (such as PID, TM) to simplify configuration;

Large scale system: Select enhanced FCS (such as KFCS2, LFCS2), support multi control drawing interconnection, high-speed scanning, and adapt to complex processes;

Continuous control: mainly based on the adjustment control block (PID-STC), combined with the calculation block to achieve parameter correction;