Supplementary Conditions; Axis Replacement; Overview - Siemens SINUMERIK 840D sl Function Manual

6.1.4

Supplementary conditions

MDI mode: Path control mode and WAITMC
In the MDI mode, when starting to execute the MDI block buffer, it is not permissible that the
WAITMC in conjunction with the path control mode (G64/G604), is located in the last block of
the MDI block buffer. Otherwise the program will stop at the last but one traversing block, and
can only be continued with a reset.
Example: MDI block buffer before NC start
Program code
N10 G64 G1 G94 F5000 X100
N20 X200
N30 X300
N40 X400
N50 WAITMC(...)
6.2

Axis replacement

6.2.1

Overview

Note
Spindles
The following statements and functions regarding the "axis replacement" function for axes also
apply to spindles.
Each axis must be assigned to a channel during control commissioning. The axis can only be
traversed, for example, by part programs or synchronized actions from the channel to which
the axis is assigned. With the "axis replacement" function, it is possible to enable an axis and
to allocate it to another channel, that is, to replace the axis. Only than can the axis be traversed
by another channel.
Axis states
As part of the "axis replacement" function, an axis can have the following states:
● "Channel axis"
A channel axis is an axis that is assigned to a channel. It can be traversed via a part program
or manually.
● "PLC axis"
A PLC axis is an axis that is assigned to the PLC. It can only be traversed by the PLC user
program or function block FC18.
Extended Functions
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
K5: Channel synchronization, axis interchange
Comment
; NC starts with N10 as first block
; Program stops with N30 !!!
6.2 Axis replacement
363