Category: Industry Trends

I/O Card Redundancy

Redundant I/O cards are available for critical applications.

The same card can be used in simplex or redundant

applications. When installed on a two-wide redundant terminal

block, the cards are recognized as a redundant pair by the

controller. The controller scans each card and determines which

card is acting as the active interface. When a fault is detected,

the system automatically switches to the standby I/O card.

DeltaV control modules reference simplex and redundant

I/O channels identically and there is no special configuration

required to take advantage of redundancy.

Switchover of a redundant I/O card is completed within

two scans of the I/O bus. Make-before-break contacts ensure

digital field instruments remain powered and the process

is undisturbed. Analog output signals are briefly driven by

both cards for <5 ms during switchover of the card.

Hardware alerts automatically report hardware integrity errors

for both the primary and secondary cards. Any event that

causes a switchover is also reported automatically through the

system hardware alerts and is logged in the Event Chronicle.

Events that can cause a switchover include:

„ Hardware failure within the active card.

„ Communications failure between the active card

and the controller.

„ Detection of a fault in the field wiring.

The S-series traditional I/O subsystem includes:

• I/O interface carrier (DIN-rail surface mounted) on which

all I/O related components are installed.

• Bulk AC to 24V DC power supply for field devices.

• A variety of analog and discrete I/O interfaces, consisting

each of an I/O card enclosed in a common form factor and

an associated I/O terminal block, which easily plug into the

I/O interface carrier.

• Cable extenders that provide flexibility in carrier mounting.

The I/O cards are connected to the field with a terminal block,

which allows removal of I/O cards without disconnecting any

field wiring.

DeltaV DCS provides control module level time stamping for log

events and alarms. For greater event resolution the 16-channel

Sequence of Event DI card can provide signal driven events to a

resolution of +/- 0.25 ms per card, or within 1 ms per controller.

Please refer to the Sequence of Events PDS for more information

on Sequence-of-event data collection and system options for this feature.

DeltaV™ S-series Traditional I/O

• Modular and flexible construction

• Reduced installation time and expense

• Easy online expansion

• Field-mounted capable hardware

• 1:1 Redundancy for traditional I/O

• Plug-and-Play I/O

Introduction

S-series traditional I/O interfaces provide improved ease

of installation with the same proven features of M-series

I/O interfaces. This modular I/O subsystem offers flexibility

during installation and is designed for extreme environmental

conditions of field installations. S-series traditional I/O is

equipped with a snap-in retention system for quick installation.

The I/O interfaces can be installed in any of the possible 64 slots.

All wiring is through the carriers and terminal blocks so that

modules can easily be removed without disconnecting any

wires. Modularity, fast installation, online expansion, and

environmentally robust hardware make DeltaV S-series

traditional I/O a smart choice for your process control system

• CHARMs (Characterization Module for each field signal.

Provides basic analog to digital conversion, connectivity

to redundant communication bus, and fault isolation).

• Cable Extenders that provide flexibility in carrier mounting.

• Baseplate terminators (provides bus terminations for

redundant I/O bus).

• 19” Migration Panels (provides DIN-rail mounting for two

migration CIOC’s or two baseplates and cable extenders

for installation into your standard 19” legacy cabinets).

The CHARM I/O card carrier is supposed to be mounted

on a vertical DIN-rail and can communicate with up to

eight CHARM Baseplates mounted vertically or on migration

panels and connected to each other through extender cables.

The bus terminators are attached to the last baseplate.

Each CHARMs Migration Baseplate Assembly is

ordered pre-loaded with 24 terminal blocks that are

ready to receive field wires from 2-, 3- , and 4-wire devices.

Electronic Marshalling eliminates the need to scramble the

field wiring or to partition the I/O to match signals to channel

types of specific cards. Simply connect field signals in an orderly

fashion as desired. Insert the appropriate CHARM into each

terminal block to complete the field circuit and the signal

is ready to be used by any, up to four controllers.

For each Migration CIOC installation you will need to

determine the quantity and connector cable length as

well as the appropriate quantity of top and/or bottom

baseplate terminators.

Product Description

Electronic Marshalling for Migrations hardware includes:

• CHARM I/O Carrier (DIN-rail mounted and supports

redundant pair of CHARM I/O Cards).

• CHARM I/O Card (CIOC) provides communication between

CHARMs and the Ethernet I/O network to M-series, S-series,

and PK controllers. The CIOC has Achilles Communications

Certification Level 1 and the redesigned CIOC2 has more

computing power and Achilles Communications Certification

Level 2. The CIOC2 is a drop-in replacement for the CIOC.

• CHARM Baseplate (DIN-rail mounted with interleaving power

and bus connectors. Supports 12 CHARMs and their terminal

blocks, as well as connection for injected field power).

• CHARM Terminal Block (removable terminal block

providing terminal connections to field wiring and physical latch for CHARM).

• I/O anywhere you need it

• Single channel granularity

• Replaces legacy I/O in place

• Fully redundant architecture

• Complete DeltaV™ solution

• Plug and play I/O

Introduction

DeltaV™ Electronic Marshalling delivers a new level of control

system I/O performance with unprecedented flexibility and

ease of use. The CHARM I/O card (CIOC) supports up to

96 individually configurable channels and when mounted

horizontally in conjunction with a legacy system migration

will allow for direct replacement of legacy hardware within

existing cabinets. Now you can migrate to DeltaV without

having to add cabinets, custom cables, or extra marshalling.

All communications are completely redundant from the

channel (CHARM) to the DeltaV controller.

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).

Replacing an existing standby controller is as simple as removing

the existing unit and installing a new controller. The active

controller will detect the standby and the system will automatically

commission and download the new hardware. A redundancy

license is required in addition to the redundant hardware. The

redundant controller appears in the Explorer window as a single

node, indicated by a redundant controller icon.

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.

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

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.

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.