Profinet I/O And Ip Address Assignment - Microscan MicroHAWK MV-20 Manual

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PROFINET I/O and IP Address Assignment

PROFINET I/O and IP Address Assignment
When PROFINET I/O is enabled on the unit, the PLC system may control the device
name, IP address, and subnet. When this is the case, it is impossible to communicate with
the unit from AutoVISION until the PLC has assigned an IP address. When the unit
disconnects from a PROFINET controller without disabling PROFINET, it may no longer
be reachable from AutoVISION. This condition may persist after cycling power on the unit
because the PROFINET I/O configuration is stored in non-volatile memory on the unit.
When disconnecting a unit from a PROFINET controller, it is recommended to always
disable PROFINET on the unit first, as this will erase the PROFINET configuration. The
unit will then remain reachable under its last known IP address.
It is possible to recover from loss of communication when PROFINET is left enabled, as
described below.
APIPA Address Assignment
When the unit fails to obtain a valid IP address, it will fall back on the APIPA (Automatic
Private Addressing) protocol after a timeout of 5 minutes.
To get an IP address, the unit will select an address at random in the range 169.254.1.0 to
169.254.254.255 with a subnet mask of 255.255.0.0. The client will then send an ARP
packet asking for the MAC address that corresponds to the randomly-generated IPv4
address. If any other machine is using that address, the client will generate another
random address and try again until it finds a free IP address.
The device network viewer can be used to discover units with an APIPA address, connect
to them, and update the IP address to a desired range.
MicroHAWK MV-20 / MV-30 / MV-40 Smart Camera Guide 3-9