Siemens SIMATIC S5 Manual page 162

Machine Data, Modes and Traversing Programs
The F function
How an F function is interpreted depends on the function which precedes it.
Table 5-23. Using the F Function in Traversing Blocks
Preceding function in
the block
G04 Dwell
X function, except for Speed
X function following
G00
G24 Number of loop passes
The "F" must be followed by an unsigned integer comprising no more than five
digits.
The M function
M functions are auxiliary functions used to control external events. An M function
consists of the letter "M", followed by a number of no more than two digits. The
binary value of that number is forwarded to the programmable controller, where
it can be evaluated to control other modules or as status info on a positioning
operation.
With the exception of the function M00, M functions following switching
functions, compensation values or offsets have no effect, and are ignored. The
M function that was active before the block was invoked remains in force.
The IP 266 interprets the M00, M02 and M99 functions directly.
• M00: Programmed stop
M00 interrupts a program for mode 8 or 9. The program can be resumed by
pressing the EXEC key.
In a block containing both M00 and G10, M00 has priority.
An "External stop" is not executed while an M function is in progress.
5-90
The F function is
Value range
interpreted as
1 to 65000
10 to 65000
0 to 65000
0=Continuous loop
IP 266
Unit
Multiple of 100 ms
mm/min
0.1 inches/min
degrees/min
EWA 4NEB 812 6057-02