
Velocities, Setpoint/Actual Value Systems, Closed-Loop Control (G2)
7.2 Metric/inch measuring system
Turning, Milling, Nibbling
122
Function Manual, 11/2012, 6FC5397-1CP10-5BA0
Input resolution and computational resolution
The input/computational resolution is set in the control via MD10200 INT_INCR_PER_MM.
The default setting for a metric system is 1000 (0.001 mm). inches is required for an inch
system.
Examples:
1 inch = 25.4 mm ⇒ 0.0001 inch = 0.00254 mm = 2.54 μm
To be able to program and display the last 40 mm, MD10200 must be assigned a value of
100000.
Only with this identical setting for both measuring systems is it possible to change the
measuring system without a significant loss of accuracy. Once MD10200 has been set to this
value, it will not need to be changed each time the measuring system is switched over.
Jog and increment weighting
MD31090 JOG_INCR_WEIGHT consists of two values containing axis-specific increment
weighting factors for each of the two dimension systems. Depending on the current setting in
MD10240 SCALING_SYSTEM_IS_METRIC, the control automatically selects the
appropriate value.
Note
MD31090 JOG_INCR_WEIGHT can only be read/written in "expert mode" access level
(protection level 1)!
Default setting for each axis:
●
Metric: MD31090 JOG_INCR_WEIGHT[0]=0.001 mm
●
Inch: MD31090 JOG_INCR_WEIGHT[1]=0.00254 mm => 0.0001 inch
Data backup
Data sets which can be read out separately from the control and which contain data relating
to the dimension system are given an INCH or METRIC identifier corresponding to
MD10240 SCALING_SYSTEM_IS_METRIC. This specifies the dimension system in which
the data were originally read out.
This information is intended to prevent data sets from being read into the control system with
a measuring system, which is different from the active system. In this case, alarm 15030 is
triggered and the write process is interrupted.
Since the language instruction is also evaluated in part programs, these can also be
"protected" against operator errors as described above. You can therefore prevent part
programs containing, e.g. only metric data, from running on an inch dimension system.