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PLC Data Comparison Instructions

S Bharadwaj Reddy
As we have seen with counter and timers, some PLC instructions generate digital values other than simple Boolean (on/off) signals. Counters have current value (CV) registers and timers have elapsed

PLC Math instructions

S Bharadwaj Reddy
The IEC 61131-3 standard specifies several dedicated ladder instructions for performing arithmetic calculations. Some of them are shown here: PLC Math instructions As with the data comparison instructions, each of

PLC Counter Instructions

S Bharadwaj Reddy
A counter is a PLC instruction that either increments (counts up) or decrements (counts down) an integer number value when prompted by the transition of a bit from 0 to

PLC Memory Mapping and I/O addressing

S Bharadwaj Reddy
A wise PLC programmer once told me that the first thing any aspiring programmer should learn about the PLC they intend to program is how the digital memory of that

PLC Program for Automatic Liquid Mixing Application

S Bharadwaj Reddy
Liquid Mixing Application This is PLC Program for Automatic Liquid mixing Application. Problem Description In many industries, there are lots of mixing system are used for solutions mixing. Some plants

PLC Program for Sequential Motor Control

S Bharadwaj Reddy
Sequential Motor Control This is PLC Program for Sequential Motor Operating System. Problem Description In many industries, there are lots of motors are used. Sometimes we need to start more

PLC Program for Two Way Switch Logic

S Bharadwaj Reddy
This is PLC Program for Two ways switch logic for staircase light in house PLC Two Way Switch Logic In duplex type house there are ground floor and first floor and

PLC Program for Automatic Lamp Control in Storage Facility

S Bharadwaj Reddy
Automatic Lamp Control This is PLC Program for Automatic lamp Control in Godown (Storage Facility). Problem Description In old process, when the person enters in the godown (Storage facility), he/she

PLC Program for Automatic Parameter Initialization when Power UP

S Bharadwaj Reddy
Parameter Initialization when Power UP This is PLC Program for Automatic Parameter initialization when power up. Problem Description In many applications it is necessary to initialize some data when machine

PLC Program for Latching and unlatching Circuit

S Bharadwaj Reddy
PLC Latching and unlatching Circuit This is PLC Program for Latching and unlatched circuit for output. Problem Description In some conveying system operator fills tank manually by operation water pump manually.

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