Download Lexium Controller - Schneider Electric

Creating a PLC program
Using I/O messaging
I/O messaging is used to transfer real time data between the PLC and the Lexium Controller :
• Commands,
• Setpoints,
• Settings,
• States,
• Measurements,
• ...
To obtain the best response time in the application choose the adequate exchange method:
• Change of State (COS),
• Cyclic,
• or Polled.
The exchange method is downloaded in the Lexium Controller by the DeviceNet scanner and must be configured by network tool (refer to
Configuring the DeviceNet scanner).
Using explicit messaging
I/O messaging is used to transfer data that does not require continuous updates between the PLC and the Lexium Controller :
• Configuration,
• Settings,
• Fault parameters,
• Log parameters;
• ...
If the PLC program configures the Lexium Controller using explicit messaging.
The new value of the parameters are not stored in EEPROM and they will be lost at next power off.
To store the values of parameters (whole configuration) in EEPROM, it is necessary to set to 1 the bit 1 of Extended control word (CMI),
refer to the Communication parameters manual.
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