12 Functional Descriptions 12.93
12.18.11 GI monitors
12.18.11.6 Special features relating to following axes
• If a following axis cannot execute its traversing motion in the LINK ON state because
certain enabling signals (controller enable, etc.) are missing, then the active leading axes
and leading spindles defined in the GI grouping are also stopped.
• The link is activated even if the CONTROLLER ENABLE is not set when LINK ON is
selected. The following axis naturally cannot be traversed without a CONTROLLER
ENABLE. Therefore, if the leading drives were to move in the LINK ON state, the GI
monitoring functions would respond.
12.18.11.7 Special features relating to following spindles
• If a following spindle stops in the LINK ON state because the required enabling signals are
missing, then the leading spindle also stops. Leading axes are not affected.
• The link is not activated if the CONTROLLER ENABLE is not set when LINK ON is
selected. The signal REQUEST LINK ON is set. In order to activate the link in this case,
another LINK ON request must be programmed after CONTROLLER ENABLE has been
set.
12.18.12 Programming
A basic distinction must be made between two different terms with regard to the configuration
and programming of gearbox interpolations:
• Configuration of gearbox interpolation (definition of link structure and link type).
The GI grouping - consisting of a maximum of 5 leading drives and one following drive - is
defined by the configuration. The configuration also includes specification of the link type
which determines how each individual leading drive in the grouping is to act on the
following drive. The required signal paths are set up internally, but not activated. The link
factor KF = 0 applies, i.e. a movement by the leading drives does not cause the following
drive to move.
• Switching gearbox interpolation on, off or over. (LINK ON, LINK OFF).
A gearbox interpolation grouping defined by the configuration can be activated (LINK ON)
or deactivated (LINK OFF).
Through activation of the appropriate G function, it is possible to select LINK ON/LINK OFF
for a specific leading/following drive pair or LINK ON/LINK OFF for all leading drives linked
to a following drive. On-the-fly synchronization of leading/following drives is thus also
possible.
The user must therefore make the following inputs for the purpose of gearbox interpolation:
• Definition of link structure with specification of leading and following drives to be linked
• Definition of link type between leading and following drives
• Link factors KF with numerator I and denominator J
FDset = KF * LDset = Numerator I/Denominator J *LDset
• Programming of certain positional references between the leading and following drives
(synchronous positions as required).
12–148 © Siemens AG 1992 All Rights Reserved 6FC5197- AA50
SINUMERIK 840C (IA)