Communication
11.2 Communication via Modbus
SIWAREX WP231
156
Manual, 07/2014, A5E31238908A-02
11.2.1.5
Writing registers
If you wish to write registers from the data records DR 3 to DR 29, you must first export the
corresponding data record to the internal output buffer using an appropriate command.
Individual registers can then be written. The complete data record must subsequently be
written internally using an appropriate command. A plausibility check of the complete data
record is carried out in the process.
Example
A parameter from DR 3 is to be written.
●
First, write register CMD3_CODE with 2003 (2000 plus the number of the data record).
●
Then write CMD3_TRIGGER with "1". The DR 3 is then updated in the Modbus memory.
●
You can now write or change one or more registers with the corresponding variable. If
you wish to transfer the written/changed registers to the scale, it is necessary to write the
complete data record:
●
First, write register CMD3_CODE with 4003 (4000 plus the number of the data record =
write data record).
●
Then write CMD3_TRIGGER with "1".
●
The data record is then transferred to the process memory in the SIWAREX module. All
registers of the data record are checked for plausibility in the process.
If the plausibility check fails, the complete data record is not written and a message is output
to the user (from the area of data/operator errors).
You can find all further command numbers in chapter
→
Command lists (Page 139).
In addition, an online document is available for working with SIWAREX WP231 and Modbus
→ Modbus communication of WP231
Summary of Contents for SIWAREX WP231
Page 16: ...Safety notes 2 1 General safety instructions SIWAREX WP231 16 Manual 07 2014 A5E31238908A 02 ...
Page 132: ......
Page 174: ...Technical data 13 3 Approvals SIWAREX WP231 174 Manual 07 2014 A5E31238908A 02 ...
Page 180: ...List of abbreviations SIWAREX WP231 180 Manual 07 2014 A5E31238908A 02 ...
Page 182: ...Index SIWAREX WP231 182 Manual 07 2014 A5E31238908A 02 ...
