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⌚Timestamps:
00:00 Intro
00:33 DCS basic structure and components
01:30 Yokogawa History
02:15 Centum VP system architecture
03:16 Network structure
05:27 Software

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In this video, we’re going to introduce you to a very popular Distributed Control System, the Yokogawa DCS Centum VP.

By definition, a DCS is a computerized control system with multiple autonomous controllers that operate and control many control loops. A DCS has no centralized supervisory control, and thus the name Distributed Control.

Field devices are connected to I/O modules located in cabinets alongside Controllers. The controllers are networked using many communication protocols such as Ethernet, Modbus, or a proprietary protocol.

There are Operator stations HMI’s located in a centralized control room, or some may be located elsewhere. The Operator stations provide access to plant operators to observe and adjust realtime plant conditions.

An Engineering station HMI is located in an area only accessible for actual control logic programming changes for any of the many control loops.

Yokogawa is a Japanese industrial company that started with the manufacture and sales of electric meters in 1915.

Yokogawa introduced its first CENTUM DCS in 1975. Centum V and CentumXL followed in the 1980s. CENTUM CS and CS 3000 were introduced in the 1990s.

The CENTUM CS 3000 line continued in the 2000s which was also the decade where the ProSafeRS SIS was introduced.

The 2010’s decade introduced us to CENTUM VP. The current version is Release 6 which was introduced in 2014.

Yokogawa refers to an HMI as a HIS (Human Interface Station). A HIS is mainly used for Operations, but additional stations can also be configured for Engineering.

The Field Control Station (FCS) provides the actual plant process control. All process information is placed on the control network called Vnet/IP.

All CENTUM devices are connected to the Vnet/IP network.

If required, an SIS called ProSafeRS is also installed and connected to the Vnet/IP network.

The unified gateway station (UGS) acts as an interface, allowing CENTUM VP to communicate with a variety of networkbased subsystems such as Modbus RTUs, Modbus/TCP units, EtherNet/IP units, and others.

Network switching is performed by layer switches. For example, L2SW is a layer 2 switch. Vnet/IP transmission media can be fiber optic or Unshielded Twisted Pair cables. Vnet/IP operates at a communication speed of 1 Gbps.

An L3SW switch is used for communicating between the two domains. Each domain can have 64 stations.

A Field Control Station (FCS) contains the Power Supply, Controller, and Field I/O modules (FIO).

The I/O Modules include Analog, Digital, and Communication Modules. For example, the Analog Module AAI143 is a 4 to 20mA, 16 channel Isolated module.

Optical node interface units (NIU) can be connected via communication modules in the Field control Unit (FCU) and do not require a switch.

The Node Interface Unit will also be connected to I/O modules or what we call NIO which stands for Network Input/Output.

ProSafeRS is a safety instrumented system (SIS) conforming to Safety Integrity Level SIL3 as defined by IEC 61508.

It is so rated with a single controller, single input, and single output module.

All components of the ProSafeRS system are a bright orange color.

The Plant Resource Manager (PRM) is the Asset Manager software package. PRM allows the use of diagnostic capabilities of smart devices like those with HART or Profibus communication.
A unique 64 function USB keyboard is available for the CENTUM VP system.

The Automation Design Suite is Yokogawa’s engineering software. Plant graphics are easily created for Operator HIS terminals.

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