Sample for Rockwell CPUs

1. Under Ethernet, New Module…, select Generic Ethernet Module.
Sample for Rockwell CPUs 1:
2. Enter the IP address from object 0x8000:21.
3. Enter 129dec for Input Instance.
4. Enter 130dec for Output Instance and
5. 128dec for Config Instance.
The data length is dependent on the Comm format.
Sample for Rockwell CPUs 2:

Note the properties of the selected Comm format

In the above sample the Comm format INT was selected, which means the number of data from objects 0x8001:05 and 0x8001:07 have to be divided by 2, since in TwinCAT they are specified in bytes and in the RSLogix in word length (INT).

An odd number of bytes must be rounded up. This also applies even if the Comm format is set to DINT, in which case you must round up to the next whole number.

Sample for Rockwell CPUs 3:

System limitations

In the case of Multicast, pay attention to the high network loads that this causes, especially in systems with many or short cycle times. A high network load may possibly impair communication.