lHardware of PLC:
1.
Power supply module
2.
Central Processing Unit (CPU)
3.
Input / Output modules
4.
Programming device or Programmer
lPLC Input module:
lPLC Output module:
lScanning sequence of PLC:
lAdvantages of PLC:
1.
Smaller physical size than hard-wire solutions.
2.
Easier and faster to make changes.
3. PLC
has integrated diagnostics and override
functions.
4.
Diagnostics are centrally available.
5.
Application can be immediately documented.
Sensors
& Transducers
lPressure sensing & measuring elements
lLevel sensing & measuring elements
lTemperature sensing & measuring elements
lFlow sensing & measuring elements
Concept
of different programming software
lCX-Programmer for Ladder diagram
lCX-Process tool for Function block
development
lNS-Designer for Operator station
lCX-Supervisor for SCADA application
lCX-Simulator for Program testing
CX-Programming
Environment
CX-Process
tool Environment
NS-Designer
Environment
CX-Supervisor
Environment
Maintenance
of PLC
l Preventive
Maintenance
l On
line Maintenance
l Off
line Maintenance
Before
maintenance of PLC an Engineer must have:
l Training
l Proper
documentation
l Spares
parts
l Practical working experience on PLC
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