Messages
9.2 Message paths
SIWAREX WP321
86 Manual, 07/2014, A5E33715669A-02
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
Evaluating messages with the help of SIWATOOL
The electronic weighing system has a message buffer that can hold up to 10 entries. If the
number of messages in the message buffer exceeds 10, the oldest entry is overwritten. The
message buffer can be read out at any time with the help of SIWATOOL (menu item "Read
out all data records") and saved together with the scale parameters. This facilitates the
detection, analysis and correction of errors in the system.
Detecting messages with the help of FB SIWA
All messages of the SIWAREX module can be completely detected and processed in the
controller with the help of the SIWAREX WP321 function block. The messages can be
evaluated directly in a signaling system by means of a bit signaling area in the scale data
block. The message texts are stored in the signaling system. The message text is output
when a bit becomes "1".
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