Omron CJ1W-PNT21 Operation Manual page 96

FINS Routing
FINS to TCP/IP Address
Address Range
Performance
82
• The FINS address is replacing the last octet of the PROFINET IO
Controller's own IP-address. If the IO Controller has the IP-address
192.168.1.5 and the FINS destination address is 45 then the destination
IP-address will be 192.168.1.45.
The order of determining the IP-address from the FINS-address is first IO
Device Numbering and then the replacement of the last octet of the IO
Controller's own IP-address. The PROFINET IO Controller does not hold an
address translation table. As the highest FINS address is 127 and the
maximum amount of IO Devices supported is 126 the highest IP-address that
can be addressed is 127.
In the example above the highest IP-address is 192.168.1.127.
The CJ1W-PNT21 PROFINET IO Controller's main task is PROFINET IO
communication. The FINS communication is performed as a low priority task.
This means that the FINS communication performance is low. Also the IO
Controller can only handle one FINS-message at a time. Therefore if multiple
devices will address the IO Controller at the same time over FINS/UDP then
some of them will not be serviced.
Section 6-3