Category: Emerson

Product Description

For critical process control applications where you can’t afford

interruptions, the DeltaV system offers controller redundancy.

The standby controller contains the same control strategies as

the active controller and the redundancy link transfers control

parameters to the standby controller to ensure it is ready to take

control if needed.

With redundancy enabled, each module will calculate the

required updates for the Standby controller when it executes.

These updates are transferred to the standby controller over

the redundancy link. These additional operations for controller

redundancy will typically reduce your CPU free time by

approximately 10%.

When a fault is detected, the standby controller can take over

without bumping the process control signals. The DeltaV Event

Chronicle stores a record of each switchover and the reason it

occurred (if the reason has been identified).

• Uninterrupted control operation

• Online upgradeable

• Automatic commissioning

• Bumpless transition

Introduction

Now you don’t have to worry about a controller hardware failure

interrupting your process and causing costly downtime. Using a

redundant controller, your process is automatically protected in

case of a hardware failure.

If an active controller fails, the standby controller takes over

automatically, providing uninterrupted control operation

without initialization or user intervention. The switchover

generates no disturbances to the field output signals, so your

process continues to run without impact. There is no special

cabling or configuration required to add redundancy, simply

add a controller to your existing hardware.

Redundant controllers also support the upgrade of controller

firmware and hardware online. You can therefore upgrade

your MD Plus to an MQ or MX or your SD Plus to an SQ or SX

controller online, with no configuration changes

Modules that work closely together to perform a specific process control function are

typically grouped in an area. An area is a logical division of a plant. Areas typically

represent plant locations or main processing functions. The configuration engineer

determines how to logically divide the plant into areas.

Nodes are physical pieces of equipment on the control network, such as a controller

or a workstation. You control your process by downloading modules in the controller

nodes. The configuration tells the node how to act and what information to receive or

save from the process.

Device Tags represent the instruments, valves, and other field devices. A Device

Signal Tag consists of a specific signal from a device.

Alarms alert the operator that an event has occurred. (Alarms are assigned to

modules.) Typically, you want the operator to perform some action and respond to the

alarm. Alarms can be both visible and audible.

The database contains configuration information and lets you make off-line changes

without affecting the process. Online control algorithm monitoring and modification

are also available.

Function blocks are building blocks for creating the continuous and discrete

algorithms that perform the control or monitoring for the process. The DeltaV

Library contains function block templates for analog control (bias/gain, lead/lag,

PID, etc.), Logical, I/O (analog and discrete input/output), and other basic functions.

Each function block contains parameters that can be modified to customize the

algorithm. Algorithms range from simple input conversions to complex control

strategies. Function blocks can be combined into composite function blocks to build

complex algorithms.

In addition to Function Block algorithms, the DeltaV system supports Sequential

Function Charts (SFCs) as well as Command-driven and State-driven algorithms

for control tasks requiring sequencing strategies.

Parameters are the user-defined data used within a module’s algorithm to perform its

calculations and logic. Parameters can be described by the type of information they

provide, such as input or output. Tables listing the parameters and their properties are

included in the Books Online information.

The DeltaV system includes a library of pre-engineered module templates with basic

characteristics. You can customize these library modules or create your own modules

from scratch. Your customized modules can be added to the library, making them

available for reuse in the development of your control strategy.

Terminology

Control strategies in the DeltaV system are configured in modules. A module, which

is the smallest logical control entity in the system, contains algorithms, conditions,

alarms, displays, historical information, and other characteristics that define the

process equipment. Algorithms are the logical steps that define how the module

behaves. The DeltaV system provides control, equipment, and unit modules.

Generally, a control module contains one uniquely tagged control entity, such as a

control loop or motor, with its associated logic. Defining a module around a single

field device and its related control logic makes it easy to create, download, operate,

debug, and take a single module out of service without affecting other modules.

Equipment modules coordinate the operation of control modules and other

equipment modules that work together to control related equipment. The algorithm

for the containing equipment module manages the operation of the contained

modules.

Unit modules can be used in non-batch applications to group control modules and

equipment modules for alarm management purposes. For example, alarms for a

specific unit, such as a boiler, can be combined. All control and equipment modules

associated with the unit will be contained within the unit module.

DeltaV System Concepts

The DeltaV system helps users create process control systems that are easy to set up,

easy to operate, consistent, and secure. To accomplish these goals, the DeltaV system

uses the following:

Plug-and-play technology for hardware configuration

A library of reusable control modules to simplify the initial configuration effort

Techniques like drag-and-drop to simplify system configuration and modification

Consistent graphical interface similar to that of the Microsoft Windows operating

environment

Integrated, context-sensitive help and online documentation

Hardware and software approaches to ensure system security and integrity

A Configuration Assistant that steps you through the configuration process,

configuring the system while teaching you the fundamentals

DeltaV System Overview

This chapter gives an overview of the DeltaV digital automation system. It takes a

brief look at the hardware, describes the basic concepts and terminology, introduces

the major software components, and ends with a summary of the ways you can find

out more about the DeltaV system from the Help and Books Online.

Hardware

The manual, Installing Your DeltaV Digital Automation System, also available as an online

book, describes the DeltaV system hardware and provides instructions for installing

and powering up the system.

The WirelessHART I/O card provides redundant communication for up to 100 WirelessHART devices,

providing high availability and reliability of wireless data.

Up to 16 Wireless HART I/O cards can communicate to a single controller.

Control modules are automatically scheduled by the controller, based on their assigned scan rates.

This allows each control function to be optimized based on the process dynamics.

Modules scan times can be set as fast as 100 ms, and as slow as 60 seconds.

The number of control modules that can be assigned to a controller depends

on the complexity and scan rate of each module, and the available CPU and memory.

The SD Plus controller should be used for small to medium applications with a maximum of 750 individual I/O signals.

The SD Plus controller is designed for harsh environments and is rated for G3 corrosive environments,

with an operating temperature range from -40 to 70 ºC.

It is ideally suited for remote installation, close to the process equipment.

For more traditional installations with central marshalling cabinets,

CHARMS I/O cards can be mounted in standard I/O cabinets providing Electronic Marshalling.

CHARMS I/O Cards can also be used for highly distributed I/O applications.

The WirelessHART I/O card provides redundant communication for up to 100 WirelessHART devices,

providing high availability and reliability of wireless data.

Up to 16 Wireless HART I/O cards can communicate to a single controller.

Control modules are automatically scheduled by the controller, based on their assigned scan rates.

This allows each control function to be optimized based on the process dynamics.

Modules scan times can be set as fast as 100 ms, and as slow as 60 seconds.

The number of control modules that can be assigned to a controller depends

on the complexity and scan rate of each module, and the available CPU and memory.

The SD Plus controller should be used for small to medium applications with a maximum of 750 individual I/O signals.

The SD Plus controller is designed for harsh environments and is rated for G3 corrosive environments,

with an operating temperature range from -40 to 70 ºC.

It is ideally suited for remote installation, close to the process equipment.

For more traditional installations with central marshalling cabinets,

CHARMS I/O cards can be mounted in standard I/O cabinets providing Electronic Marshalling.

CHARMS I/O Cards can also be used for highly distributed I/O applications.

Product Description

The SD Plus controller executes control logic based on the process signals derived

from the I/O subsystem and provides communication to the rest of

the DeltaV control system for operator interaction and data collection.

Each controller node can be installed as a simplex or redundant node.

Redundancy is provided by adding a second controller and power supply

mounted adjacent to the primary controller.

The controllers are connected to the I/O carriers, which are mounted to the right of the controller carriers.

Up to 8 carriers with 8 cards each can be connected to the local bus I/O, for a total of 64 traditional I/O cards.

In addition to the 8 local I/O carriers, each controller can communicate

with an additional 16 Remote I/O units hosting traditional card based I/O.

In addition to traditional I/O cards, the local bus supports field bus technologies,

including Foundation fieldbus, Profibus DP, DeviceNet and AS-I protocols.

The I/O subsystem also supports Serial interface cards as well as the Ethernet I/O interface.

These various I/O products provide a wide range of interfaces to meet the needs of your control application.

The SD Plus also supports CHARMS and WirelessHART IO cards.

The CHARMS I/O card (CIOC) connects via the redundant Ethernet

ports of the controller and provide a highly distributed and flexible I/O solution called Electronic Marshalling.