Home » Programmable Logic Controller (PLC) Questions and Answers – 14
Question For You

Programmable Logic Controller (PLC) Questions and Answers – 14

Siemens S7-200 PLC Questions and Answers

Suppose we have a Siemens S7-200 PLC connected to a pair of process switches and light bulbs as shown in this illustration:

Siemens PLC Block Diagram

Examine the following relay ladder logic (RLL) program for this Siemens PLC, determining the statuses of the two lamps provided the temperature switch senses 102 oF and the flow switch senses 4.7 GPM:

Siemens Ladder

Also, determine whether the inputs on this PLC are sourcing or sinking, based on how they are connected to the process switches.

Answer :

Green lamp is off, red lamp is on. The PLC inputs are configured here to sink current.

Share Your Answer / Comments

Credits :  Tony R. Kuphaldt – under CC BY 1.0

For More PLC Questions : CLICK HERE

 

Similar Articles:

Related Articles

How to Connect Proximity Switch (Source Type) to Make LED ON ?

S Bharadwaj Reddy

DP Transmitter Error Calculations

S Bharadwaj Reddy

Displacer Level Transmitter 5-point Calibration

S Bharadwaj Reddy

Programmable Logic Controller (PLC) Questions and Answers – 3

S Bharadwaj Reddy

Programmable Logic Controller (PLC) Questions and Answers – 8

S Bharadwaj Reddy

Motor Trip Logic using PLC Programming

S Bharadwaj Reddy

Leave a Comment

This website uses cookies to improve your experience. We'll assume you're ok with this, but you can opt-out if you wish. Accept Read More

WordPress Image Lightbox