Siemens SINUMERIK 840D sl Function Manual page 1759

2.3.6 Multiple feedrate values in one block
Application
The functionality described in the following is used primarily for grinding, but is not restricted
to it.
References:
/FB2/ Function Manual, Extended Functions; Grinding (W4)
/FB2/ Function Manual, Extended Functions; Oscillation (P5)
Functionality
The function "Multiple feedrates in one block" can be used to activate 6 different feedrate
values of an NC block, a dwell time or a retraction motion synchronously, depending on the
external digital and/or analog inputs.
Retraction
Retraction by the programmed amount is initiated in the IPO cycle.
Signals
The HW input signals are combined in one input byte for the function "Multiple feedrate in
one block". A permanent functional assignment applies within the byte:
Table 2-1
Input no.
Feedrate address
I7 to I2
I1
I0
Basic logic functions: Feeds (V1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
Input byte for "Multiple feedrates in one block"
Bit 7 Bit 6
I7 I6
F7 F6
Activation of feedrates F7 to F2
Activation of dwell time ST (in seconds)
Activation of retraction motion SR
Bit 5 Bit 4 Bit 3
I5 I4 I3
F5 F4 F3
Detailed description
2.3 Feedrate control
Bit 2 Bit 1 Bit 0
I2 I1 I0
F2 ST SR
43