Siemens SINUMERIK 840D Function Manual page 166

V1: Feedrates
5.4 Feedrate control
Signals
The input signals are combined in one input byte for the function. A fixed functional assignment
applies within the byte.
Table 5-1
Input no.
Feedrate address
I7 to I2: Activation of feedrates F7 to F2
E1: Activation of the dwell time ST/STA (in seconds)
I0: Activation of the retraction motion SR/SRA
Priority of the signals
The signals are scanned in ascending order starting at I0. Therefore, the retraction motion (SR)
has the highest priority and the feedrate F7 the lowest priority.
SR and ST end the feedrate motions that were activated with F2 to F7.
SR also ends ST, i.e. the complete function.
The signal with the highest priority determines the current feedrate.
The response to loss of the respective highest-priority input (F2 - F7) can be defined with the
machine data:
MD21230 $MC_MULTFEED_STORE_MASK (storage behavior for the "Multiple feedrate
values in one block" function)
Bit
2 ... 7
The end-of-block criterion is satisfied when:
● The programmed end position is reached
● The retraction motion ends (SR)
● The dwell time elapses (ST)
Hardware assignment
The input byte for the "Multiple feedrate values in one block" function can be assigned a
maximum of two digital input bytes or comparator input bytes of the NC I/O:
MD21220 $MC_MULTFEED_ASSIGN_FASTIN (assignment of the input bytes of the NC I/O
for "Multiple feedrate values in one block"), bits 0 ... 15
The input bits can also be inverted:
166
Input byte for the "Multiple feedrates in one block" function
7
I7
F7 F6
Value Meaning
0 With the loss of the respective highest-priority input, the associated feedrate is not
retained (default setting).
1 Set bit 2 to 7 ensures that the associated feedrate (F2 to F7) that was selected by the
respective highest-priority input signal is also retained when there is a loss of the
input signal and a lower-priority input is active.
Bit
6 5 4
I6 I5 I4
F5 F4
Function Manual, 06/2019, A5E47437747B AA
3 2 1
I3 I2 I1
F3 F2 ST
Axes and spindles
0
I0
SR