Auxiliary Function Outputs - Siemens SINUMERIK 840D sl Programming Manual

Fundamentals

2.13 Auxiliary function outputs

2.13 Auxiliary function outputs
Function
The auxiliary function output sends information to the PLC indicating when the NC program
needs the PLC to perform specific switching operations on the machine tool. The auxiliary
functions are output, together with their parameters, to the PLC interface. The transferred
values and signals must be processed by the PLC user program.
Auxiliary functions
The following auxiliary functions can be transferred to the PLC:
Auxiliary Function
Tool selection
Tool offset
Feedrate
Spindle speed
M functions
H functions
For each function group or single function, machine data is used to define whether the output
is triggered before, with or after the traversing motion.
The PLC can be programmed to acknowledge auxiliary function outputs in various ways.
Properties
Important properties of the auxiliary function are shown in the following overview table:
Function Address extension
Meaning
M -
Spindle no.
Any
342
Value
Range Range
0 0 ... 99
(implicit)
1 - 12 1 ... 99
0 - 99 100 ...
2147483647
Address
T
D, DL
F/FA
S
M
H
Explanations
Type Meaning
INT Function The address extension is 0
for the range between 0 and
99.
Mandatory without address
extension:
M0, M1, M2, M17, M30
INT Function M3, M4, M5, M19, M70 with
address extension spindle
no. (e.g. M2=5; spindle stop
for spindle 2).
Without spindle number, the
function applies for the mas‐
ter spindle.
INT Function User M function*
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
Maximum
number per
block
5
NC programming