Siemens SIMATIC S7-300 Manual page 232

Description of Functions
9.4 System of measurement
Overview
At the start of parameterization, you must fill in the basic machine data item
system of measurement (MD7). This item governs the input of values.
Variants of the You can set the system of measurement for the following three units:
system of
measurement
Input of
All value inputs and all value ranges refer to the setting in the system of mea-
machine data surement.
Internal
In "Parameterize FM 354" and in the FM 354 itself, values are processed in
processing of
the following base units:
values
Examples The sample values in the table below illustrate the relation between the sys-
tem of measurement and internal values:
mm
inches
degrees
Note
The measurement system (MD7) must match the measurement system speci-
fied in the other DBs.
The measurement system raster (MSR) is the smallest distance unit in the
active system of measurement.
If at some point you have failed to take this precaution:
1. Delete all data blocks (which do not match the measurement system) or
2. Modify the other data blocks on the PG.
3. Reload the data blocks to the FM 354.
9-56
mm
inches
degrees
0.001 0.001 mm
0.0001 inch
0.0001 degree
System of mea- Internal values
surement
-3
10 mm
-4
10 inch
-4
10 degree
-2
10 degree
clear the memory of the FM 354 completely.
Input at interface
-3
10 995 10 mm 10.995 mm
-4
10,995 10 inch 1.0995 inch
-4
3,600,000 10 de- 360.0000 degree
gree 360.00 degree
-2
36,000 10 degree
FM 354 Servo Drive Positioning Module