How about you use the appropriate S5 manual to decode what each of the operation mean. Put commentary along each code line and put that here. Then someone might consider making some further contribution. As you did not mention which S5 was used, perhaps this manual would do well enough..

S5-135U/155U CPU 928/CPU 928B/CPU 948 List of Operations

One hint the "=" with text refer to a label. So the assumption is that this code lives in a subroutine / program block which has declared input and output parameters. Consider putting down what those are.

What PLC are you using?  The TM pos input modules are for s7-1500 / ET200SP, not S5 95-U.

Have you tried downloading sample projects using the TMPOSINPUT module to see how Siemens suggests configuring and using high speed counting on that module?

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The PLC is S5 95-U and this function is developed for Highspeed counter 25/500KHZ, that mention INW = IW98 from the Counter module. on the replace of this counter we are using TMPOSINPUT-1 (ET 200SP, TM Posinput 1 6ES7138-6BA01-0BA0). So i dont know how to make the logic for this TMPOSINPUT . so we plan to keep the old logic . please suggest.

The LAD code equivalent is in the below picture. The code assumes that the encoder value is a DINT value. It is also assumed that the range of the movement will not exceed the value that the DINT can represent. That assumption should be okay, since the S5 used an INT value.

The near equivalent STL, coded for the S7-1500 / S7-300 / S7-400 can be seen in the attached export text file.

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Thank for your reply. The attached image is the complete program what should I maintain in the new module as per the old logic.

The code piece I have given you is what you asked for. One difference is that the design assume you have a DINT value coming from the encoder side. The code segment is blind to what hardware base is used.

I urge you to make an effort to understand the design intent of the code blocks in the original S5 PLC system. It will save you time in the long run.

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We are using S71200 PLC, we don't know how to create the program for TM POS input .we need to maintain the existing program .but the existing program we need to call the address IW96 .how should I make the address from the TM POS input and how can I do the configuration.

On our designs the S7-1200 based systems makes use of the built in high speed counters. These are sourced from the built-in inputs. There is no need for us to use a special card from an ET200 remote IO. There is no practical experience for me to build on to give an answer.

Consider starting a topic where you concentrate the subject matter on how to pair the TM / ET200 with the S7-1200. The "Simatic Technology" conference is the right place to open the topic.

Do not neglect to do some self study of the technical manual of the TM card. You may need to ask Siemens for direction if no volunteer here comes forward to help. You can use the "Support Request" link to speak to the official Siemens Support Team.