Siemens SINUMERIK 840Di Function Manual page 1223

PLC/axis, spindle, drive signals
The axis-specific and spindle-specific signals are divided into the following groups:
• Shared axis/spindle signals
• Axis signals
• Spindle signals
• Drive signals
The signals are transmitted cyclically at the start of OB 1 with the following exceptions:
Exceptions include:
• Axial F value
• M value and
• S value
An axial F value is entered via the M, S, F distributor of the basic program if it is transferred
to the PLC during the NC machining process.
The M and S value are also entered via the M, S, F distributor of the basic program if one or
both values requires processing.
Fig. 2-8
PLC Basic Program Solution Line (P3 sl)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
Interface between PLC and axes/spindles/drives
Detailed Description
2.6 Interface structure
2-29