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NVL or Network Variables List

https://help.codesys.com/api-content/2/codesys/3.5.13.0/en/_cds_f_networkvariables/


AdvantagesDisadvantages
Easy to useUses UDP protocol, UDP provides a simpler and less reliable form of data transmission
Data transmission efficiency: NVL sends data in packets

Delivery is not guaranteed

Absence of a main node: NVL does not have a binding to a main or subordinate node, making it more flexible in usage and managementOnly UDP protocol or it's limited protocol support

Optional data reading: Since data can be available to all nodes, there is no guarantee that all nodes will read or use this data

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For transmitting BOOL data, it's possible to use one bit from a 16-bit word register. As for INT data (integer numbers), they can also be transmitted via Modbus TCP by placing them in two consecutive 16-bit word registers.





Sorce:

https://help.codesys.com/api-content/2/codesys/3.5.13.0/en/_cds_f_networkvariables/
https://forge.codesys.com/forum/en/124/genmed-Network_Functionality_V23.pdf









Source:/Helpful links:

Configuring a Network Variable Exchange:
https://help.codesys.com/api-content/2/codesys/3.5.13.0/en/_cds_configuring_network_variables_exchange/

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