We are starting about SIEMENS PLC. SIEMENS AG is German multinational company Conglomerate Company. It’s Headquarter located in Munich, Germany. It is one of the largest Europe based electronics and electrical company.
SIEMENS principal activities are in field of industry, energy, transportation and Health care.
Founder of this company is Werner Von Siemens. Company Founded in 1 October 1847 (Berlin).
There are many plc series are in market but for better study we use
Series à S7- 200
SoftwareàStep 7 Microwin
Driver àPC/PPI cable driver
Communication port à RS 485
Inputs:: i0.0, i0.1, i0.2……i0.7 ------------------------------ These are inputs card number.
i1.0, i1.1, i1.2…….i1.7
Outputs:: Q0.0, Q0.1, Q0.2…….Q0.7
Q1.0, Q1.1, Q1.2…….Q1.7---------------------------These are outputs card number
Counter instruction: CTU (For counter up), CTD (For counter down)
Counter number: C0 to C255
Timer instruction: TON (On delay timer), TOFF (OFF delay timer)
Timer: - Time Base Number
1ms T32, T96
10ms T33-T36, T97-T100
100ms T37-T63, T101-T255
Memory bit:: M0.0, M0.1, M0.2……M0.7 ………………these are address for memory
M1.0, M1.1, M1.2…….M1.7
Memory word: - MW0, MW2, MW3… Memory name
Timer Accumulator: - C0, C1……..C255 ……………..To give source or accumulate time
Counter used
Positive edge:
Compare instruction:
Positive edge is a switch which first takes desired contact. After that it becomes positive (p). We should restart for sending pulse again.
Negative edge is a switch which first takes desired contact. After that it becomes Negative (N). We should restart for sending pulse again.
Comparison instruction helps us to compare two data in our program.
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