Well I dunno, thought I would post what I have so far in case anyone else runs into this.
It seems you can only do large transfers through a MSG instruction, is what I have arrived at. I don’t know if that works for me for a SLAVE device connection to get the tags out I need or not. I would need to purchase these items to test it out to see if this can be setup, I have no clue if this works, but atleast I got an answer from RA what hardware and versions I need to attempt it and get someone else started too incase you encounter this as well. Good Luck!
As per attached snapshot of error , it seems that you are trying to increase data size for Generic ethernet module.
For Generic Ethernet module,
Error : Failed to modify properties Invalid Output size
The number of output configured output tags is too large
The limit is 124 tags of the type DINT
The limit is 248 tags of the type INT
The limit is 496 tags of the type SINT
Error : Failed to modify properties Invalid Input size
The number of input tags configured for the profile is too large
The limit is 125 tags of the type DINT
The limit is 250 tags of the type INT
The limit is 500 tags of the type SINT
Large CIP generic messages (messages up 3980 bytes) are available with some requirements. Large messages are typically used with socket programming to send and receive more then 480 bytes of data at a time. The Large Connection checkbox is enabled only when the Connected box is checked and CIP Generic is selected as the message type on the Configuration tab.
To use Large messages with a ControlLogix controller and a 1756-EN2T(R) module, the following are required:
· 1756-EN2T(R) and 1756-EN3TR modules at revision 5.x and higher for socket support
· Logix Designer application, version 21.00.00 or later and RSLogix 5000 software, version 20.00.00 or later
· The Large Connection and Connected checkboxes must be checked in the message instruction(s)
Selecting the CIP Generic message type enables the Large Connection option on the Communication tab. Use large CIP Generic connections when a message is greater than 480 bytes. 500 bytes is typical, but there are headers at the front of the message. Large CIP connections are for messages up to 3980 bytes.
• The Large Connection box is enabled only when the Connected box is checked and CIP Generic is selected as the message type on the Configuration tab.
• The Large Connection option is available only in Logix Designer application, version 21.00.00 or later and RSLogix 5000 software, version 20.00.00 or later.
You can refer this from https://literature.rockwellautomation.com/idc/groups/literature/documents/rm/1756-rm003_-en-p.pdf (Chapter 4)
I tossed a project together to grab the screen shots to go along with this: