Scale parameters and functions
8.29 DR 32 Error messages
SIWAREX WP251
Manual, 12/2015, A5E37203357A
145
Current load cell signal in mV
Display of currently measured signal voltage of the load cell(s) between the SIG+ and SIG-
terminals in millivolts (mV).
This parameter indicates the calculated fine weight currently used by WP251. The value can
differ from the specification in DR 23 because it may have been adjusted by the proportional
controller.
This parameter indicates the calculated trailing weight currently used by WP251. The value
can differ from the specification in DR 23 because it may have been adjusted by the
proportional controller.
Tolerance limits TH2, TH1, TL1 and TL2
The tolerance limits specified in DR 22 are always output in DR 31 in the weight unit
because different options are available in DR 22 for specifying the tolerance limits (absolute
values, relative values or according to OIML R-61).
DR 32 Error messages
8.29.1
Data record DR 32 is used for Modbus communication with a Modbus master in order to
identify or evaluate an error message from WP251. The individual message bits are set to
TRUE state for three seconds in the event of an error and do not have to be acknowledged
to the SIWAREX module.
All Modbus registers in DR 32 are automatically updated and do not have to be requested by
a read command.
For operation with a SIMATIC CPU, the use of DR 32 is unnecessary because the error
information is made available to the CPU or HMI automatically in the data block via the I/O
area of the WP251.
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