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There are total 14 instructions under the bit logic instruction like NO contact, NC contact, SR flip-flop, RS flip-flop,invert power flow etc. lets see the detailed use of them.  A) Normally open contact :- Normally open contacts are closed when the bit value stored at the specific address is equal to 1 (one)(here the specific address refers to the address assigned to the NO contact), when we press the Normally open contact assigned to the specific address then it becomes functionally closed and we get supply. here in below fig. when we press the NO contact I0.0 then Output Q0.0 gets ON and when we release the input I0.0 then Output gets OFF. B)Normally Closed Contact :- Normally closed contacts are closed when the bit value stored at the specific add, i.e. the address assigned to the NC contact is equal to 0(zero). when we press the Normally closed contact assigned to the specific address then it becomes functionally open and supply is cuts off. NC contact wor...

In this article i am going to show you how you can configure your simatic manager software for simulation. In addition i will tell you how you can change your ladder program in to 1) statement list 2) Function block. So let's start with first part- configuration of simatic manager for simulation. Step 1 : open the simatic manager. Step 2 : Close the wizard window. Step 3 : Create a new project by = File >New Step 4 : It will pop up new project window, now give name to your project and click on OK Step 5 : Double click on to the simatic 300. Step 6 : Now click on the hardware and start configuration of hardware. Step 7 : first add a rail into your hardware and add the Power supply, CPU, and SM module cards at slot no 1,2,4 respectively. you can add various SM module cards from slot 4 onward  Step 8 : now come into simatic manager window and click on blocks and then click on OB1, and then choose a programming langua...

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 t...