Thanks it worked .

please suggest me the equivalent instruction to calculate time for execution of a particular instruction  for CPU 315-2 PN/DP in Simatic Manager . 

It helps me to migrate my TIA project to Simatic manager 

qwazee

Use the RUNTIME instruction.
That is what it is meant for.
See the following article.

LINK: For S7-1200/S7-1500, how do you measure the runtime of the complete program, subprograms or specific organization blocks?

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Split from How to calculate time of execution of one statement in SCL with CPU 1516F-3 PN/DP in TIA.

Closed cause question posted twice.

The second thread with the subject How to read the time required to execute an instruction with CPU 315-2 PN/DP in Simatic Manager V5.6 is published within the conference STEP 7 / STEP 7 Lite.