Long term timers

Example 1:
Long-term Timers
The following program examples show two ways to create long-term timers
with standard TIM and CNT instructions.
Two TIM Instructions
In this example, two TIM instructions are combined to make a 30-minute
timer.

ladder logic

TIM and CNT Instructions

In this example, a TIM instruction and a CNT instruction are combined to make a 500-second timer.TIM 0001 generates a pulse every 5 s and CNT 0002 counts these pulses. The set value for this combination is the timer interval × counter SV. In this case, the timer SV would be 5 s x 100 = 500 s. With this combination, thelong-term timer’s PV is actually the PV of a counter, which is maintained through power interruptions.

PLC timer ladder logic 1

for more information, go to yourplctrainer.com

PLC to servo driver

i have been asked about the connection from PLC to servo driver. The connection is not as hard as you would have been imagined.
First thing that is important in doing the wiring is that we need to identify the power requirements of our PLC, our inputs and our outputs. Please take note that some PLCs are powered by AC power and transistor output PLCs are powered by DC power. As for the case of PLC that have pulse outputs, it is powered by DC power ( i dont know any of AC).

http://plctutorial.blogspot.com

The basic wiring from PLC to servo driver is as the diagram below,

plc to servo connection

For more information, go to yourplctrainer.com

PLC programming

This is a sample PLC programming that you can try.

A straightforward ladder logic using just the basic instructions to move the pneumatics actuator back and forth.

Click HERE to get the sample!

PLC ladder logic: tutorials and guides

This website will give you PLC open source for the latest PLC programming projects. It covers the new PLC technology with the aim to educate people on a good PLC programming style that ensures easy troubleshooting and maintenance. Free tutorials and guides with an easy-to-understand example are provided.

This website also covers the hardwiring aspect of PLC. Real examples are taken as case study to make the learning process even more effective.