Messages; Message Types; Message Paths - Siemens SIWAREX WP241 Manual

Messages

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 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
● Output by means of data records DR 30 and DR 32 in case of communication with a
SIWAREX WP241
Manual, 04/2014, A5E33713528A
Modbus master
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