B3: Distributed systems - 840D sl only
2.2 NCU link
Extended Functions
120 Function Manual, 03/2013, 6FC5397-1BP40-3BA1
Leading, lead-link and following axis
NC-specific machine data
Number Identifier $MN_ Meaning
MD10000 AXCONF_MACHAX_NAME_TAB Machine axis name
MD10002 AXCONF_LOGIC_MACHAX_TAB Logical machine axis image
Channel-specific machine data
Number Identifier $MC_ Meaning
MD20070 AXCONF_MACHAX_USED Used machine axis
Axis-specific machine data
Number Identifier $MA_ Meaning
MD30554 AXCONF_ASSIGN_MASTER_NCU Master NCU
If a machine axis can be traversed for several NCUs, one NCU must
be defined as master NCU. The setpoint generation is made after the
startup of the control for this NCU.
2.2.5.3 System variables to enter a leading value
Leading values can be specified on the NCU of the leading axis using the following system
variable:
● Position leading value: $AA_LEAD_SP[<leading axis>]
● Velocity leading value: $AA_LEAD_SV[<leading axis>]
When making a change, the values are also transferred to the NCU of the following axis per
NCU link.
Note
These system variables have a lower transfer priority than those of the link variables.
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