Computer Drive Installation Instructions

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

SINUMERIK 840C (IA)