12 Functional Descriptions 01.99
12.34 Actual value passive monitoring axis (as from SW 6.3)
12.34 Actual value passive monitoring axis (as from SW 6.3)12.34.1 General
Special technological demands require the actual value of a measuring circuit at the same time
in several axes. This entails that a measuring circuit is read out for the second time from a
passive monitoring axis. For this reason, passive monitoring axes have the same drive
measuring module numbers.
12.34.2 Parameterization
NC machine data 1832* bit 1 activates the release of the measuring circuit for multiple
assignment (bit 2 in the 2nd measuring system) in the 1st measuring system. Bit 3 defines in
the 1st measuring system the axis as principal axis or as actual value passive monitoring axis
(bit 4 in the 2nd measuring system). If bit 3 or 4 is set on an axis, then the following
restrictions apply to that measuring system.
12.34.3 Restrictions
Principal axis: No functional restrictions
Actual value passive monitoring axis: Referencing, ”in-process measuring”,
”extended measuring” and EnDat absolute
encoder are not permitted.
Remedy for actual value passive monitoring axis: Referencing is achieved by setting a
reference dimension (set actual value).
The actual value is read from the principal
axis, e.g. over high-speed PLC data
channel.
Use of the measuring function directly on
the principal axis.
12.34.4 Alarm messages
The following alarm messages may occur in this context:
Alarm message 1080* ”Hardware referencing on passive
monitoring axis” by invalid use of
referencing
Alarm message 1076* ”Hardware measuring” by invalid use of
measuring
Alarm message 1012* ”Parameterization error NC MD” by more
than one parameterized principal axis per
measuring circuit
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SINUMERIK 840C (IA)