Why do we have to configure a protocole SNMPV1 or SNMPV3 with M580 PLC range Firmware >= 4.xx

All the Modicon PLCs (Quantum, Premium, M340, M580firmware<4.x) were equiped with the protocol SNMPV1.
SNMPV1 and SNMPV3 have been implemented in M580 firmware >=4.x.
SNMPV1 is not a cybersecured protocole.
SNMPV3 is cybercecured. By selecting SNMP V3, the user must define a username...
For cybersecurity reason when we select a M580 CPU firmware >=4.xx, SNMPV3 is selected and enable.by default.
So to be able to build an application using a M580 CPU V4.x and more recents versions, the user must select the protocol SNMPV1 or (SNMPV3 by defining a username).

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