Siemens SIMATIC FM 453 Manual page 310

Servo drive / step drive positioning module
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Writing Traversing Programs
Infinite Loop M18
M18 is always output as the last M function in the block.
Two cases are distinguished:
Change Signal
If M97 or M98 is programmed in a block, the M function output proceeds via
Programmable as
the digital outputs as defined in machine data item MD35, in the same way as
Digital Output
the checkback signals.
M97, M98
Tool Offset
Twenty tool offset numbers (D1...D20) are available. D0 in conjunction with
Number D
G43 or G44 causes the tool offset to be switched off. The offset values must
previously have been loaded to the module. Nonstandard offset values have a
value 0.
Subprogram Call
A block with a subprogram call (P is the "number of calls", L is the "program
P, L
number") cannot contain any further information.
P = Number of subprogram callup
10-14
M function M18 is output like any other M function. Only after the block
has been processed all the way to the end (including M18) does the axis
skip back to the start of the program.
If M function M18 is programmed alone in the last block of a traversing
program, the M function is not output, and the axis immediately skips
back to the start of the program.
Name
Lower Input Limit
Upper Input Limit
1
FM 453 Servo Drive / Step Drive Positioning Module
C79000-G7076-C453-01
250

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