Siemens SINUMERIK 840C - Manual (Page 928)

10.94 12 Functional Descriptions
12.18.12 Programming
A gearbox chain must not be closed in the active state, i.e. if a chain is defined such that a
following drive at the end is also acting as the leading drive at the start of the chain, then it
is strictly illegal for all links to be active at the same time. The user must take measures
via the PLC, e.g. INTERLOCK LINK ON to ensure that this situation does not arise.
No system monitoring function is provided.
Note:
This function is replaced by the "Variable cascading" function with SW 4 and higher. If a
gearbox chain is incorrectly defined, the error message "NC timeout" is output.
12.18.12.1 Programming via NC part program
Function G function
Define/erase configuration G401
Switch link on/off G402
Switch on link with on-the-fly
synchronization
G403
Switch off link G400
Axis synchronization G200
Please refer to the documentation entitled "NC Programming Guide" for further information.
12.18.12.2 Programming via PLC
The gearbox interpolation groupings can be influenced and checked via the interface signals of
DB29(following axes) and DB31(following spindle). ON and OFF commands for the gearbox
link can also be issued via the PLC. However, the PLC cannot be used to change a gearbox
link configuration.
12.18.12.3 Programming via input display
Please refer to the documentation entitled "Operator's Guide" for further information.
12.18.12.4 Default settings via machine data
Machine data can be used to set defaults for the link structures and to disable reconfiguration
and link factor switchover. These functions are particularly important for machines with forced-
linked drives (e.g. gantry or portal machines).
• NC MD 1456*/495* Default setting for link structure
• NC MD 1844*/525* bit0 Axis/spindle may be following axis/spindle
• NC MD 1844*/525* bit1 Reconfiguration permissible
• NC MD 1844*/525* bit2 Switchover of link factor permissible
• NC MD 1844*/525* bit3 Overwriting of synchronous position permissible
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50 12–153
SINUMERIK 840C (IA)