SIWAREX WP251
Manual, 12/2015, A5E37203357A
163
Three types are distinguished:
Operating errors can occur spontaneously at any time due to an unforeseen event. They
include internal and external hardware problems which can occur spontaneously during
weighing, e.g. wire break of the load cell cable.
Data and operating errors
Data and command errors arise always as response to a command or a data record transfer.
A data error occurs when a plausibility error is identified in a data record sent to the module,
causing the module to refuse acceptance of the data record.
A command error occurs when the module cannot execute the issued command in its
current operating state.
For most data/command errors, SIWAREX WP251 outputs additional information for the
error. This includes further details about the error and is described in detail in the error list in
this section.
Technology messages occur spontaneously due to the process flow of a weighing/dosing.
Messages provide information to the operator and have no further effect on the dosing
operation.
You can read out the messages using different paths. You define the path for forwarding and
processing of messages during configuration.
The messages are processed for two basic purposes:
● For display on an Operator Panel for the operator
● For linking in the control software to control specific reactions in the process.
The following message paths are possible:
● Output of the message buffer to the SIWATOOL program (takes place automatically)
● Output via the WP251 function block (see Communication with SIMATIC S7-1200
(Page 185))
● Output via data record DR 32 in case of communication with a Modbus master
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