B3: Distributed systems - 840D sl only
2.2 NCU link
Extended Functions
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
121
2.2.5.4 Supplementary conditions
The following supplementary conditions must be observed:
● The leading axis cannot be a link axis
● The leading axis cannot be a container axis
● The leading axis cannot be a gantry axis
● The leading axis may only be replaced within its own NCU (see Section "Axis/spindle
repla
cement (Page 320)")
● Cou
plings with lead link axes must not be cascaded
● A lead link axis must not be traversed independently of the leading axis
Note
"Lead link axes and "link axes" functions
Because the "lead link axes and "link axes" functions require different settings in machine
data: MD18720 $MN_MM_SERVO_FIFO_SIZE, they cannot be used simultaneously
within a link group.
2.2.5.5 Example
A detailed example for parameterizing and programming an axis coupling with lead-link axis
is provided in the Section: "Examples" > "Lead link axis (Page 135)".
2.2.6 System of units within a link group
For a cross-NCU interpolation, the same system of units must be active on all NCUs of the
link group.
Common system of units changeover via HMI
The following conditions must be fulfilled for all NCUs of the link group in order that a system
of units changeover can be made from the HMI user interface of an NCU of the link group as
well as on all other NCUs of the link group:
● MD10260 $MN_CONVERT_SCALING_SYSTEM = 1
● For all channels:
MD20110 $MC_RESET_MODE_MASK, Bit 0 = 1
● All channels are in the reset state
● No axis is traversed in the JOG or DRF mode or via the PLC
● The function "constant grinding wheel peripheral speed (GWPS)" is not active.
If, on one NCU of the link group, one of the specified conditions is not fulfilled, then the
system of units changeover is not made on any of the NCUs of the link group.
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