B3: Distributed systems - 840D sl only
2.2 NCU link
Extended Functions
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
119
2.2.5.2 Parameterization
Link communication
NC-specific machine data
Number Identifier $MN_ Meaning
MD12510 NCU_LINKNO Unique numerical identification of the NCU within the link group. The
identifiers must be assigned without any gaps in ascending ordering
starting from 1.
Value range: 1, 2, ... Maximum NCU number
Note:
The NCU to which the value 1 is assigned as NCU identification is the
master NCU of the link group. The parameterization of link axes and
axis containers may only be made with the machine and setting data of
the master NCU.
MD18780 MM_NCU_LINK_MASK.Bit 0 Activation of the link communication
MD18781 NCU_LINK_CONNECTIONS Number of internal link connections
Note:
It is recommended to retain the default value 0 (determination of the
number by the NC).
MD18782 MM_LINK_NUM_OF_MODULES Number of NCUs to be connected with one another via NCU link.
Setpoint synchronization
NC-specific machine data
Number Identifier $MN_ Meaning
MD18720 MM_SERVO_FIFO_SIZE Size of the IPO/SERVO data buffer
The transfer of the setpoints of the leading axis via the NCU link to the
NCU of the lead-link axis produces a deadtime of two interpolator
cycles. The dead time is compensated by parameterizing the sizes of
the IPO/SERVO data buffer on the NCU of the leading axis and the
NCU of the lead-link axis:
• NCU of the leading axis: 4
• NCU of the lead-link axis: 2
Note
With the simultaneous use of lead link axes and cross-NCU axis containers, the axis
container means machine data MD18720 $MN_MM_SERVO_FIFO_SIZE = 3 must be set.
This means a synchronous output of the setpoints for leading and following axis is not
possible. The offset then has the size of one interpolator cycle.
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