I have measured the execution time of these instructions:

MOVE_BLK for 500 bytes block: 50 μs

FILL_BLK for 3000 bytes block (char to char array): 100 μs

I was using this manual for it: For S7-1200/S7-1500, how do you measure the runtime of the complete program, subprograms or specific organization blocks?

Here I present some new measurement.

To have a reference, this is a testing CPU: 1212C, firmware version v4.5 (the same as in previous post).

Declared speed in the manual for this CPU:

Real math execution speed 2.3 μs/instruction
Boolean execution speed 0.08 μs/instruction

I have made a loop with 100 iterations, a code is in SCL. Time is for the one iteration:

• EXP       2.2 μs
• SQRT    2.4 μs
• LN         2.0 μs
  
• INT_TO_REAL   3.5 μs
• +, -, *, /       5.1 μs