Tells about DCS , evolution, types,history and networking.

3. CONTROL SYSTEMS TREND
1) PLC
2) DCS
3) PC - Based Control.
4) SCADA
PLC : Introduced in the late 1960 to replace Relays and Hard-wired
Programming.
DCS : Introduced in the Mid-1970 to replace pneumatic controls by
using computers.
PC-Based Control : Introduced by the early 1980s to avoid the
proprietary PLC & DCS systems.
SCADA : Supervisory control & Data Acquisition basically introduced for
long distance material transfer.

4.  CENTRALISED CONTROL: With the advent of minicomputer, sensors and
actuators were into the Central Control (Computer).
 DISTRIBUTED CONTROL: With the advent of LOCAL CONTROL : Initially
control was performed local to the equipment control. The ADVANTAGE
was low wiring costs .DISADVANTAGES were - not much control, monitoring,
alarming & history.
 microcomputer, Distributed control systems were installed in the plants
near to the control room via proprietary digital communications lines
called as Data Hiway. First DCS was developed by Honeywell,U.S in 1975.
The ADVANTAGES were greatly reduced wiring costs, much more
limited
failure and less cost to add more points.
The DISADVANTAGES were that wiring costs were that wiring
costs were still significant and there was lack of interoperability among
controllers of various manufacturers due to the proprietary protocols.
Hence the user was locked into a single vendor.

5. The importance of DCS systems to increase as global competitive
dynamics in food and beverage, specialty metals, pulp and paper,
pharmaceutical and fire chemical processing.
The DCS has networking capabilities which are useful for business
management.
The DCS has capacity for processing large number of I/O points.
TYPES OF DCS :
1) Conventional DCS .
2) PLC based DCS.
3) Hybrid DCS.
4) Open DCS System
DCS

6. HONEYWELL PLANTSCAPE
ARCHITECTURE

7. History Module
•LCN Module. Stores process and system information that can be
displayed.
•Based on microprocessors 68020.
•Winchester disk for data storage.
•Communicates with all Modules on the LCN.
•Stores history and general information.

8. 24vdc
509 -BOD

9. A network provides a means of connecting multiple
devices together for the purposes of exchanging
information.
EtherNet Network
email
A common example of a network is an office where the computers are
connected together using an Ethernet network for the purpose of sending
emails or printing documents on a networked printer.
document
Printer

10.  There are many reasons to use a network.
Some examples are:
› Data Acquisition from the Control System
› Control devices in a remote location
› Data Sharing Between PLC Controllers
› The ability to program devices from a remote location
› The ability to troubleshoot problems from a remote
location
› The ability to integrate all production areas of a plant
› The ability to integrate manufacturing systems with
business systems

11.  Many different networks exist for a variety of reasons:
› Different manufacturers
› Newer networks developed
› Designed for many devices transferring large data blocks
› Designed to be inexpensive
› Designed for maximum reliability
› Designed to support many communication protocols (languages)
 Many of these items are mutually exclusive. For
example, if a network was designed to support many
communication protocols, it cannot also be designed
to be the least expensive. Therefore, one network can’t
be designed to do everything the best.

12.  Examples of networks used in industrial
automation today:
› EtherNet/IP
› ControlNet
› DeviceNet
› DH+
› Remote I/O
› Foundation Fieldbus
› Profibus DP
› Modbus
› AS-i
› InterBus

13.  Networks are often referred using the
following categories:
› Fieldbus
› Information
› Control
› Device
› Sensor

14.  There are many reasons to use a network.
Some examples are:
› Data Acquisition from the Control System
› Control devices in a remote location
› Data Sharing Between PLC Controllers
› The ability to program devices from a remote location
› The ability to troubleshoot problems from a remote
location
› The ability to integrate all production areas of a plant
› The ability to integrate manufacturing systems with
business systems

15.  Many different networks exist for a variety of reasons:
› Different manufacturers
› Newer networks developed
› Designed for many devices transferring large data blocks
› Designed to be inexpensive
› Designed for maximum reliability
› Designed to support many communication protocols (languages)
 Many of these items are mutually exclusive. For
example, if a network was designed to support many
communication protocols, it cannot also be designed
to be the least expensive. Therefore, one network can’t
be designed to do everything the best.

16.  Examples of networks used in industrial
automation today:
› EtherNet/IP
› ControlNet
› DeviceNet
› DH+
› Remote I/O
› Foundation Fieldbus
› Profibus DP
› Modbus
› AS-i
› InterBus

17.  Networks are often referred using the
following categories:
› Fieldbus
› Information
› Control
› Device
› Sensor