Siemens SINUMERIK 840C Installation Instructions Manual page 925

12 Functional Descriptions
12.18.12 Programming
General information about programming
• When a GI function is programmed, the following block is not read in until the GI request
of the preceding block has been fully executed. The ultimate response of the control
system to block changes can be influenced by means of machine data (NC MD
1848*/526*).
• Only one G function in one G group may be programmed for each NC block.
• The gearbox interpolation G functions may be programmed with any permissible NC
function. However, all GI parameters must be inserted at the end of the NC block in the
correct program sequence. G90/G91 may also be inserted into a GI command.
Example:
N10 G91 G01 Z500 F200 G403 G90 X200 I1 J3 Y100
• The gearbox interpolation is operative within a mode group, but is also a cross-channel
function, i.e. the leading drives may be situated in different channels.
• The maximum number of possible GI groupings is restricted only by the capacity of the
computer. GI groupings are defined on a drive-specific basis, i.e. every axis/spindle can
theoretically act as a following axis/spindle. The number of possible groupings is
dependent on the required computing capacity (LR/IPO clock cycle, number of
drives/mode groups/channels, etc.)
Configuration of the GI grouping
• Up to 5 leading drives and one following axis may be included in a GI grouping. The status
of the leading drives is entirely optional, i.e. they can be real or simulated drives, rotary or
linear axes or spindles.
• The following axis can be a real rotary axis or a real linear axis.
• Up to 4 leading axes/1 leading spindle may act on a following spindle within a GI grouping.
The leading axes can be real or simulated, rotary or linear axes.
• In the case of a following spindle, exactly one leading spindle may and must be defined
within the grouping. However, another 4 leading axes may also be defined.
• Every GI grouping must be defined by means of a separate configuration block in the NC
program.
• A given axis or spindle can be defined only once as the following drive.
• There are two configuring options in the case of spindles with C-axis, i.e. to define the
spindle as the following spindle or the C-axis as the following axis.
• When a configuration is changed by adding or removing a leading drive or selecting
another link type, the entire NC block must be written with all leading drives.
• The configuration can only be changed after LINK OFF and ERASE CONFIGURATION.
• When the link factor is re-programmed to KF = 0, no further setpoints are generated for
the following drive although the link remains in the LINK ON state.
• When a GI grouping is configured, all link factors initially have a default setting of zero.
Only after LINK ON/OVER do the values programmed in the LINK ON command (e.g.
G402...) become valid; setpoints are then generated for the following axis.
• The gearbox configuration can be changed in any channel of the mode group. The last
instruction given is the active instruction, i.e. there are no priorities.
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SINUMERIK 840C (IA)