Multiple Feedrate Values In One Block - Siemens SINUMERIK 828D Function Manual

V1: Feedrates
17.4 Feedrate control
17.4.6

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:
• Function Manual, Extended Functions; Grinding (W4)
• Function Manual, Expanded 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 17-1 Input byte for "Multiple feedrates in one block"
Bit 7
Input no.
I7
Feedrate address
F7
Activation of feedrates F7 to F2
I7 to I2
Activation of dwell time ST (in seconds)
I1
Activation of retraction motion SR
I0
Priorities
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 - F7.
SR also ends ST, i.e. the complete function.
The highest-priority signal determines the current feedrate.
Machine data:
MD21230 MULTFEED_STORE_MASK
(store input signals for the "Multiple feedrates in one block" function)
can be used to define the response on loss of the highest-priority input in each case (F2 - F7).
1398
Bit 6 Bit 5 Bit 4
I6 I5 I4
F6 F5 F4
Bit 3 Bit 2 Bit 1
I3 I2 I1
F3 F2 ST
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Bit 0
I0
SR
Basic Functions