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Why does the weight value on the PMESWT0100 freeze and stop updating?

Issue:
The Weighing value transmitted by the partner module PMESWT0100 to the CPU is suddenly fixed and does not change anymore based on the actual weight. HMI Values which are connected to the SCAIME HMI ports are not affected.
The module needs to be reseated (unplugged and plugged back in) for the weight value to start working again.

 
Product Line:
M580 PAC
PMESWT0100 
 
Environment:
Unity Pro 13.0 & 13.1
Control Expert v14 
 
Cause:
We discovered that the PMESWT0100 module has a firmware bug which causes the freezing of the value transmitted from the module to the CPU after several weeks of operation.
As a consequence, the value displayed in Unity Pro does not change based on the actual weight and remains fixed at the last known good value.

The module needs to be reseated (unplugged and plugged back in) for the weight value to start working again.

The probability of this occuring is random and the issue manifests under specific contexts.
Criticality largely depends of how the site application is developed and if other means of detecting potential issues on the weighing function are present such as continuous monitoring of the analog value.  
 
Resolution:
Improvements to Unity Pro software can be found in hotfixes for v13.1 "UnityPro_V131_HF0470178R" and
"UnityPro_V131_HF0465853R_SCAIME DTM" 
These software improvements can be found natively to Control Expert v14.


PV 02  DOM 1906 or later:
Improvements correcting this firmware bug are native to modules with PV 02  DOM 1906 or later

PV 01  DOM 1905 or Before:
Firmware Update 1.15 is also available for modules with PV01.
Firmware upgrade can be performed through the Unity Loader Tool. See Attachment



 
 






 
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