Bosch Rexroth Tightening System 350, Manual

Page: 273 / 641

3 608 878 300 Tightening Technology | Bosch Rexroth AG 273 /641
System 350 | 3 608 878 300/2019-03
The assignment of the result values to the individual data elements in the PLC is described on page 273 .
Number format
Values can basically be written to the data elements on the PLC using two different number formats
3))
:
• Binary numbers
• ASCII characters
Although the binary numbers provide a more compact display, they are more difficult to use for further
processing (you might need to convert them into ASCII characters), while results output with ASCII
characters needs more memory space but offers simpler processing.
The number format of the measurement values when displaying the results as binary numbers is
described in Table
6–31 (page 275) . The number “–2147483648 (0x80000000)” represents an invalid
value
1)
for the actual result values for torque, angle, and gradient. This is always the case if the controller
has not listed a value (e.g. if no target or monitoring function has been selected for “ angle ”, then the set
and actual angle values as well as the torque threshold are missing. These values will then be displayed
as "–2147483648").
For results output in ASCII format, the display and the number of digits before and after the decimal point
is described in more detail in Table
6–30 .
Results values that are not available (see above) are filled with space characters " " (20Hex).
Default format: Format 2
A fixed output format is defined if Format 2 has been selected. It contains set and actual value output in
ASCII format with specific formatting (see page 274) . If Format 2 has been selected, the settings for
number format and results values are fixed and cannot be changed.
6.3.4.4 Data elements result
Here, you can set which results values are stored in which data element/data word.
Fig. 6–43: Assignment of tightening results to data elements/data words
To create a new assignment:
1. Select the tightening channel the results of which you want to output (e.g. FO 1 for results of
tightening application 1).
Only one tightening channel ( Ch 0.1 ) is available in the CS351 compact system.
The set and actual values are separated from each other in the data element and are written at the end of
the section. If no set values are output, then less data elements may have to be transferred; the transfer
time, and thus the time needed for a tightening process, is shorter.
1) The value –21474836480 is used as the initialization value in the system.
This setting only influences which data element will be used to save the results values to. Results values
are correctly assigned by setting the communication unit's data element/data word assignment to
correspond with the partner controller. Both settings must be the same.