Messages
9
9.1 Message types
The messages in the electronic weighing system described here are divided into three types.
System status messages
System status messages can be generated spontaneously at any time by an unexpected
event. They include internal and external hardware problems which can occur spontaneously
during weighing.
Data and operating errors
The data and operating errors are always a response to a command due to a plausibility check.
These are data errors if a plausibility error has been detected in a data packet which was sent
to the module and receipt of the packet has been rejected by the module.
These are operating errors if the module cannot execute the sent command in its current
operating state.
Technology errors
Technology errors occur spontaneously due to the process flow of a weighing.
Status bits, on the other hand, are not messages. The status displays describe the status of the
scale during normal operation and can be monitored or evaluated at any time.
9.2 Message paths
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 or recording 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 by means of function block as bit field in Scale data block
● Certain operating errors can be transmitted as diagnostic interrupts to the SIMATIC CPU
and evaluated by OB82
SIWAREX WP321
Operating Instructions, 08/2019, A5E33715669A-AD 97
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