65. Introduction to Pulse Timers in PLC Programming
In this lesson you’ll find answers to the following questions:
What types of timers are available in the S7 PLCs?
How do the pulse timers work?
What’s the difference between typical pulse timers and continues pulse timers?
How can you figure out which data type and format every input or outpu...
If you suddenly change the rotation direction of a heavy duty motor, the motor is going to be damaged. In this lesson I’m going to write a PLC program that can protect the motor when it’s going to reverse direction. We’ll change the motor rotation direction without damaging it.
77. What are the requirements for installing STEP 7 (TIA Portal) V13?
What are the hardware and software requirements for your computer to be able to install STEP 7 V13?
Can of STEP 7 V13 be installed in Parallel with the older versions of STEP 7, WinCC and WinCC flexible?
In a factory that manufactures steel pipes they use a system named water test to make sure that the pipes are manufactured properly. In this and the next lessons, I’m going to write a PLC program using on-delay and off-delay timers to control this test procedure automatically.
86. Using NO or NC Contacts in PLC Programming _ Part 1
One of the things that some beginner PLC programmers sometimes struggle with is using open and close contact in the software. In this and next lesson, I’m going to clear this up by using a few simple examples.
In previous lessons I wrote a PLC program for running the motor in both momentary and latched modes. In another lesson I wrote a PLC program to run and stop a heavy three phase motor and a fan with a single momentary switch. In the momentary program, there was only one switch that we could use as...