Block Diagram of PLC.

Hardware / Block diagram of PLC.

Above fig. shows the block diagram of PLC.

Processor ( Central processing Unit ) :-

This Unit consists Microprocessor.
The function of this block is to interprets the input signal and carries out control action according to program stored in it memory and communicate the decision as an action signal to the Output.

Power Supply :-

The main function of power supply is to convert mains AC voltage tot Low DC voltage (5 Volt) necessary for the processor and the circuit in the input and output interface.

Programming Devices :-

Programming Devices are used to enter the required program into the memory of the processor.
Initially we develop program in programming devices and then transfers to memory of PLC.

Memory Unit :-

This is the unit where programs are stored, that is to be used for the control action to be exercised by the microprocessor.
Here Data is stored from input for processing and for the output for outputting.

Input and Output Section :-

This is the part of PLC system where processor received signal from external devices and communicate information to external devices.

Communication Interface :-

The communication interface is used to receive and transmit data on communication networks from or to other remote PLC's.
It is concerned with such an action as Device Verification, Data Acquisition, Synchronization between User application & Connection Management.

Comments

Q1. Lamp should glow when start switch S1 is made ON. lamp should go off after 15 sec automatically. lamp should go OFF immediately when start switch S1 is made OFF. Lamp should go OFF immediately also when reset switch S2 is made ON even before the expiry of 15 sec time.

Timers in Siemens PLC Simatic manager

Timer :- Timer is nothing but a specialized clock in a programming software used to count the preset time intervals. In Siemens PLC we have various ty pes of timers as :- 1) S_PULSE(Pulse timer), 2) S_PEXT(Extended Pulse Timer), 3) S_ODT(On Delay Timer), 4) S_ODTS(Retentive On Delay Timer), 5) S_OFFDT(Off Delay Timer). You must find out another five instruction sets in Timer Block in Simatic Manager STEP 7 as :- -(SP) pulse timer coil, -(SE) extended pulse timer coil, -(SD) on delay timer coil, -(SS) retentive on delay timer coil, -(SF) off delay timer coil. 1) S_PULSE(Pulse timer) :- S_PULSE Timer Above Fig Shows how to use this timer in programming software,in this fig i have used 5 sec as a preset value, If you want to change it replace the 5 with any duration you want in S5T# 5 S. In S_PULSE timer if input to timer is ON then timer starts Counting time as well as we get the Output at the instant the input is made ON. In this timer if we mad

HOW TO DOWNLOAD AND INSTALL WONDERWARE FOR WINDOWS 8,7,10.

##You can Download a ZIP file of the software From Below link. https://drive.google.com/file/d/159y8W0c_bw0vvf1DNDQ08_QsLZ9h2Tb1/view?usp=sharing 1 ) You Can Also Watch a Video Tutorial of it below. 2) You can also read out steps from below :-

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