Programming instructions

NC Programming 17VRS Motion Blocks
4-61
DOK-MTC200-NC**PRO*V17-ANW1-EN-P
the SPS or from the user interface, an error message will be issued. If the
user attempts to do this in the NC-program using the MTD command, an
error message will be issued, and the NC will stop processing. Some ex-
ceptions are the data elements 005 angular offset and 006 position offset
of synchronized spindles 1 and 2. The user can modify them at any time
during synchronized operation, either from the SPS via the user interface
or from the NC-program.
4.9 Follower and Gantry Axes
Uses of Follower and Gantry Axes
The function Follower axis groups or gantry axis referred to below as syn-
chronized axis group allows up to four feed axes to be operated in syn-
chronization.
Each feed axis can be declared a master axis, and up to 3 synchronized
slave axes can be assigned to it. The master axis and the slave axes
together comprise a synchronized axis group. Such groups can be acti-
vated or deactivated depending on the operating mode, or they can be
kept active during the entire operation of the machine, including homing
operations. When they are in the inactive state, they can be reconfigured
during machine operation from the SPS and the NC as well as by means
of the user interface. Up to 4 different synchronized axis groups can be
simultaneously active after for each process.
During synchronized operation, all the slave axes in the group follow the
path traveled by the master axis, taking into account their respective
translation ratios and their directions of rotation.
Permissible Configurations
The following rules describe the configurations which are permissible for
synchronized operation. If the NC detects a violation of these rules, it in-
terrupts processing and generates an error message.
•
One master axis and at least one slave axes must be present in each
synchronized axis group.
•
A synchronized axis group must not contain more than one master
axis.
•
A maximum of three slave axes may be present in each synchronized
axis group.
•
All axes in a synchronized axis group must belong in the same process.
−
If the axis of a different process is to participate as a master or
slave axis in the synchronized axis group, this fact must be de-
clared to the respective process using default axis transfer com-
mands (FAX/GAX).
•
All axes in a synchronized axis group must be located on a single
APRB card.
•
The master axis must have a lower drive number than the slave axes
on the SERCOS loop.
•
A single axis cannot be both a master axis and at the same time a
slave axis.
•
All axes in a synchronized axis group must be of the same axis type
(linear, modulo rotating rotary, or limited rotating rotary axes).
•
Tool storage axes must not be part of a synchronized axis group, ei-
ther as master axes or as slave axes.
•
If rotary axes form a synchronized axis group, they must be pro-
grammed using the same number of divisions per revolution.