YOKOGAWA CENTUM CS 3000 Integrated Production Control System

It can be composed of dual stacked LCD, touch panel function, eight-control-key operation keyboard, and auxiliary contact I/O while succeeding the operability of the existing humanmachine interface.

Open Display Style Console Type HIS

The Open Display Style Console Type HIS is composed of a console assembly and a general purpose PC. It is a new type of human interface station.

It is composed of LCD. As the options, dual stacked LCD, touch panel function, eight-controlkey operation keyboard, and auxiliary contact I/O can be selected, so that its configuration is selectable.

One-touch Multi-window Display Functions

Multiple windows (related windows) can be displayed simultaneously; dynamic window set functions allow you to register a group of windows and display them with the touch of a key.

High-speed Data Update

Data acquisition functions allow display updating as fast as 1 sec. This level of performance is required for manual control of pressure and flow.

Multi-monitor Function

The multi-monitor function enables one general purpose PC to use two monitors, permitting to display more information.

4.1 Configuration of FCS Control Functions

4.1.1 Function Blocks

Function blocks are the basic unit for performing control and calculations. Continuous control, sequence control (sequence tables and logic charts) and calculations are performed by function blocks. Continuous control blocks, calculation blocks, and sequence control blocks are interconnected in a manner similar to the conventional instrument flow diagrams.

4.1.2 Control Drawings (Option)

A control drawing consists of two or more control blocks representing a control function, and makes it easy to perform engineering and maintenance. The control drawing makes it easy to monitor process phases, and the status of related groups of devices, rather than monitoring on an individual-device basis.

Refer to Item 3.6.1 for an example of a control drawing display.

The features of control drawings are described below.

You can mix Continuous and Sequence Control

You can mix continuous and sequence control in a control drawing, and create control functions which match your process.

Free Signal Flow between Control Drawings

Function block I/O signals may extend outside a control drawing to another control drawing. Functionally this is the same as signals between function blocks on a single control drawing.

4.1.3 Regulatory Control Functions

These functions support continuous-process feedback control. Function blocks which support continuous processes are provided.

Regulatory Control Blocks

These control blocks are for controlling analog (continuous) process variables.

Some representative regulatory control function blocks are shown below. The labelled boxes on the outside of the function block represent I/O terminals. Symbols in circles, and lists of items in brackets, represent data items.

For regulatory control blocks, process variable inputs, cascade set points, manipulated variable outputs – such inputs and outputs to / from the block are expressed as 0 to 100%, as illustrated in the figure below. (Thermocouple and RTD temperature data are in temperature units.)

4.1.4 Sequence Control Functions

Sequence control performs several control steps in a predefined sequence.

Types of Sequence Control

• Program control (multi-phase type):Performs control according to a predefined program.

• Conditional control (supervisory type):Monitors the process status and performs conditional control.

Methods of Representing Sequences

You can create a sequence control program to run in the FCS using sequence tables, Sequence Flow Charts (SFC), and logic charts. The relationship between sequence control blocks and other function blocks, process I/O and software I/O is illustrated below.

The figure below shows how sequence control blocks (which contain the sequence control functions) relate to other function blocks, process I/O, and software I/O.

Sequence Table Block

Sequence table blocks are decision-table-format function blocks with input signal logic and output signal logic represented by Y/N patterns. They can connect to other function blocks, and are ideal for creating monitoring sequences or phase progress sequences.

Refer to item 3.6.2 for an example of a sequence table block display.

An example of a sequence table block is shown below.

Logic Chart Blocks

A logic chart consists of function blocks of interlock block diagram type, which describe the relationship between input signals (condition signals) and output signals (action signals) with logic-operation elements. The main function is to control interlock sequences.

Switch Instrument Blocks

Switch instrument function blocks are used for monitoring, for starting and stopping motors and valve actuators, and opening/shutting ON/OFF valves. In general, they are used with sequence table blocks or logic chart blocks.

Sequence Element Blocks

Sequence Element Blocks include timers, counters and code conversion blocks, and are mainly used for sequence I/O signal processing.

Valve Monitoring Blocks

Valve monitoring blocks are used for monitoring the ON/OFF status of valves and for comparing the manipulated output signal with the answerback signal from the valve.