Cyclical Program Execution.

Types of automation topologies & Components of automation

Configuration of SITRANS TH300 in SIMATIC Manager

Description:

SITRANS TH 300 with HART protocol is designed to support all common thermocouples, resistance and milli-volt sensors

Setup is quick and easy with SIMATIC PDM

It works on DC voltage sources

Configuration of SITRANS P300 in SIMATIC Manager

Description:

It is a pressure measuring Instrument which is generally use for Absolute pressure measurement.

It can measure with accuracy ≤ 0.075%

It can work within limit of 1.3 bar pressure.

Silicon oil is used in Fluid filling in case in use of food industry edible oil is used because silicon is hazardous to human health.

 

Explanation:

First of all the mounting of instrument is done as per requirement.

When the pressure is applied in the valve of the instrument pressure is applied on Diaphragm so that it bends and piezoelectric plate is mounted on it.

When the piezoelectric plate bends the resistance is decrease in it so that when electric signal transmit on it difference can be shown on display that is measured pressure.

The readings in different units can be found using this instrument.

We can connect the equipment to the computer using PC/PD coupler and CP5711 via Profibus PA and Profibus PD can be analyzed on Simatic PDM. 

Schematic Diagram:

                                                                           

Configuration Steps:

Connect SITRANS P 300 to PC via Profibus and PC\PD Coupler.

Set the parameters of SITRANS P 300 using Mode button

Open SIMATIC PDM

File > New Project

View > Process Device Network View

Options > Set PG\PC interface [Select CP5711 Profibus 1<active>]

Project > Insert new object > Networks

Networks> Insert new object > Communication network > assign device type <Profibus network>

In profibus network Give the address of instrument i.e. 1-126 any number and assign instrument SITRANS P300

Open device > Open Project <upload \download to PG\PC>

Observe the result in process variable.

Conclusion:

Proper Commissioning of Device leads to accurate pressure measurement.

Position and Place of mounting is should be proper to get accurate output.

For Safety of the plant and workers this instrument is necessary.

We can conclude that by using this instrument we can maintain the pressure by setting higher and lower limit in equipment such as boiler, pressure vessel etc. and proper safety measures can be achieved.

                         
                                                                                                                 By Kartik Pandav

Latching Cercuit (Controlling The motor by pressing Start Stop Button)

Latching Circuit for Motor Control – Ladder Logic Application

Objective:

Control a motor using a momentary Start and Stop push-button setup. Once the motor is turned ON using the Start button, it remains ON until the Stop button is pressed—even if the Start button is released.

Working Principle:

• Start Button (I0.0): When pressed, it activates the motor.

• Latching Logic: Keeps the motor energized using feedback from the output coil (Q0.0), forming a memory loop.

• Stop Button (I0.1): Interrupts the circuit and stops the motor.

I/O Address Mapping

Device	Address
Start Button	I0.0
Stop Button	I0.1
Motor Output	Q0.0

Ladder Logic Program

 Explanation:

• Rung 1 activates Q0.0 (Motor) when:

  • Start (I0.0) is pressed

  • AND Stop (I0.1) is NOT pressed

  • AND Motor output (Q0.0) is held ON through latching

• The latching branch uses the motor’s output (Q0.0) to keep the rung true even after releasing the Start button.

• Pressing the Stop button breaks the rung logic, de-energizing the motor.

 

AND & OR Gate Opertion in Ladder language

AND & OR Gate Operation Using Ladder Logic

🎯 Objective:

Control two lamps using four switches through:

• AND Gate logic (series connection)
• OR Gate logic (parallel connection)

📘 Application Description

We have four input switches and two output lamps. Two control scenarios are implemented:

✅ Task 1 – AND Gate Logic (Series Connection)

• Inputs: SW1 (I0.0), SW2 (I0.1)
• Output: Lamp 1 (Q0.0)
• Logic: Lamp 1 turns ON only if both SW1 and SW2 are turned ON.
• Equivalent to: Q0.0 = I0.0 AND I0.1

✅ Task 2 – OR Gate Logic (Parallel Connection)

• Inputs: SW3 (I0.2), SW4 (I0.3)
• Output: Lamp 2 (Q0.1)
• Logic: Lamp 2 turns ON if either SW3 or SW4 is ON.
• Equivalent to: Q0.1 = I0.2 OR I0.3

🧠 Input/Output Assignment

Device	Address
SW1	I0.0
SW2	I0.1
SW3	I0.2
SW4	I0.3
Lamp 1	Q0.0
Lamp 2	Q0.1

 

Network 1 :-The first rung connects SW1 and SW2 in series—mimicking an AND gate.

Network 2 :- The second rung connects SW3 and SW4 in parallel—mimicking an OR gate.