-
8/8/2019 E - Learning Instrument
1/17
POWER PLANT INSTRUMENTATION
ControlLogix 5000 PLC is used for Interlock of power plant
Auxiliaries.
SCADA system is used for operating
equipments as well as On-line recording of Analog data.
2 * 25 KVA UPS system is used for power back-up of instruments.
During auxiliarypower failure UPS power is associated withthe
equipment safety.
Individual Indicators/Controllers aremounted at control desk and
hoocked-upwith the SCADA system.
-
8/8/2019 E - Learning Instrument
2/17
Basic Building Blocks of a PLC
Standard Sectional Rail/ chassis/rack /Bus UnitsPower Supply
ModuleCentral Processing ModuleInput ModulesOutput
Modulesprogramming unitback up batterymemory sub module
-
8/8/2019 E - Learning Instrument
3/17
ControlNet Nodes of PLCControlLogix SystemBoiler-2 ,TG-2 &
BOPControlLogix System
Boiler-1 & TG-1
Analog I/O ModulesDigital I/O Modules
Panel ViewOperator Interface
ProgrammingTerminal
ControlNet Network
-
8/8/2019 E - Learning Instrument
4/17
-
8/8/2019 E - Learning Instrument
5/17
Ladder Logic Components
Rung
Input InstructionOutput Instruction
Branch
Documentation If pushbutton A or pushbutton B is pressed . .
.
Power Rail
Branch : A separate path on a rung.
.
-
8/8/2019 E - Learning Instrument
6/17
Advantages of PLC1. PLC is easy to program and install. PLC is
provided with quick releasetype screw connections for fast wiring
of input and output devices. PLCediting features allow program
changes, corrections, and loadingprocedures to be accomplished in a
matter of seconds in most cases.2. The speed with which internal
timers operate is much faster than
conventional time delay relay systems. For example, a typical
time delayrelay can produce a short delay as fast as 150
milliseconds (ms)., with areset period of 300 ms. A PLC can produce
a short delay of 15 ms, withreset period of approximately 15 ms. In
terms of speed difference betweentwo systems, a PLC is roughly 13
times faster. An assembly machineusing a PLC would therefore have a
higher productivity rate.3. Access to PLC is restricted by hardware
features such as key locks,and by software features, such as
passwords . Timers and their timingsvalues can also be protected
through special commands.
-
8/8/2019 E - Learning Instrument
7/17
Advantages of PLC4. Problem solving with PLCs is a major
advantage over any other type of control system. Many PLCs are
provided with diagnosticindicators which monitor power supply,
central processing unitfaults, low battery power memory backup,
input and outputconditions, forced output conditions, etc.5. PLCs
can be designed with communication capabilities that allowthem to
converse with local and remote computer systems or toprovide human
interface. These interface range from simple light or annunciator
system with alphanumeric displays, to elaborate videoscreens that
allow the current state of process to be viewed.6. PLCs are
extremely reliable control devices and can obtained informs that
can survive and function in harsh conditions. They can
meet almost any set of installation code requirements.
-
8/8/2019 E - Learning Instrument
8/17
-
8/8/2019 E - Learning Instrument
9/17
-
8/8/2019 E - Learning Instrument
10/17
-
8/8/2019 E - Learning Instrument
11/17
-
8/8/2019 E - Learning Instrument
12/17
-
8/8/2019 E - Learning Instrument
13/17
-
8/8/2019 E - Learning Instrument
14/17
-
8/8/2019 E - Learning Instrument
15/17
-
8/8/2019 E - Learning Instrument
16/17
-
8/8/2019 E - Learning Instrument
17/17
