Problem Description

to
 
update
 
Trend
 
display
 
every
 
5secs

RUNG002, RUNG003 and RUNG004 updates temperature data in corresponding registers every 5secs.

Timer is in auto reset mode, hence timer will keep running till it is manually stopped by operator.
Runtime Test Cases
Inputs Outputs Physical elements
I:3/0 = 1 O:4/0 = 1 Start temperature displaying
T4:0/DN = 1 N7:7 = N7:1, N7:8 = N7:3, Accum = 0 Update temperature & reset timer
PLC Program to Store Data of Various Process Sequentially
This is a PLC Program to Store Data of Various Process Sequentially.
Problem Description
There are total two parameters to be monitored of a tank. Display level and temperature of this tank for
5secs each. Implement this in PLC using Ladder Diagram programming language.
Problem Solution

---


Continuous measurement is necessary in this case.

Continuous level measuring devices such as Ultrasonic or Pressure level sensor can be used and for
temperature, RTD or Thermocouple can be used.

Output of these sensors are in analog form, so to deal with such analog data, analog modules are used in
PLC.

Analog modules convert analog signal into equivalent hex form.

Convert this into Temperature in degree centigrade and level in height in cm.

Generate time base to MOV output storing register value to display address after converting into BCD
equivalent.

Use either number of timers or Sequential Output instruction to solve this problem.
PLC Program
Here is PLC program to Store Data of Various Process Sequentially, along with program explanation and
run time test cases.
List of Inputs and Outputs
I:1
= Level Input from Tank 
(Input)
I:2
= Temperature Input from of the Tank
(Input)
N7:0 and N7:1
= Store and process data of tank level
(Register)
N7:2 and N7:3
= Store and process data of tank Temperature
(Register)
T4:0, T4:1
= Timers to switch display data every 5secs
(Timers)