Jetter JC-120MC, User Manual

Page: 276 / 634

276 Jetter AG
10 Programming
10.3.7 Executing an ARP request
Several controllers are interconnected via the Jetter Ethernet system bus. This
is the case now. Controller B is exchanged. In this case, the IP address
remains the same, but the Ethernet address (MAC address) changes. This
way, data interchange between controller A and the new controller B is not
possible.
To enable data interchange between the two controllers again, controller A
would have to be relaunched.
To prevent a relaunch of controller A, an ARP request must be executed on
controller A.
The controller A inquires from the Jetter Ethernet system bus, which node has
got which specific IP address. Controller B reports that it has got this
IP address. MAC address and IP address of controller B are aligned with each
other. Now, controller A is informed of the MAC address which controller B has
got. From now on, data interchange is possible again.
Topic Page
Executing an ARP request .......................................................................... 277
Use case
Phases of an ARP
request
Contents