Communication Size Limits

[DCEN_Tony]

Hello

I have been asked to find out what Input/output byte size limitations the various Ethernet based commuications possibilities are with a CtrlX Core in Drive: 

1. CtrlX OS  Profinet Device - Max number of  Input/ output bytes that can be declared?

2. CtrlX OS OPC UA Pub/Sub and Client - Any restriction on number of read/write data bytes in one packet?

3. CtrlX OS OPC UA Server - Any restriction on data table size?

4. CODESYS Ethernet IP Adapter - Max number of  Input/ output bytes that can be declared?

5. CODESYS Profinet Device - Max number of  Input/ output bytes that can be declared?

6. CODESYS TCP/UDP Function blocks - Max packet size?

7. CODESYS MQTT - Max packet size?  ( I have seen Solved: adjust Maximun packet size in the parameter list (boschrexroth.com) but it wasn't clear if there was any restriction)

I have done various offline tests (e.g. 4 and 5 above did not seem to generate any errors with huge IO size) and searched documentation but struggling to find definitive answers....maybe it is just a limit of network and hardware performance?

Many Thanks

[Thoomas · Accepted solution]

I start with some answers – links into the documentations:

1. CtrlX OS  Profinet Device - Max number of  Input/ output bytes that can be declared?
   EN: https://docs.automation.boschrexroth.com/doc/3703895296/profinet-device-app-features/latest/en/?sel=...
   DE: https://docs.automation.boschrexroth.com/doc/3703895296/profinet-device-app-features/latest/de/?sel=...
2. CtrlX OS OPC UA Pub/Sub and Client - Any restriction on number of read/write data bytes in one packet?
   For clients see the links below and the links for the OPC UA Server:
   EN: https://docs.automation.boschrexroth.com/doc/894340029/eigenschaften/latest/en/?sel=AwegjCAsKq0EwC5g...
   DE: https://docs.automation.boschrexroth.com/doc/894340029/eigenschaften/latest/de/?sel=AwegjCAsKq0EwC5g...
3. CtrlX OS OPC UA Server - Any restriction on data table size?
   EN: https://docs.automation.boschrexroth.com/doc/412150158/eigenschaften/latest/en/?sel=AwegjCAsKq0EwC5g...
   DE: https://docs.automation.boschrexroth.com/doc/412150158/eigenschaften/latest/de/?sel=AwegjCAsKq0EwC5g...

For all CODESYS fieldbus communications see the link below and the linked sites by CODESYS directly:
CODESYS - Fieldbus Communication (boschrexroth.com)

4. CODESYS Ethernet IP Adapter - Max number of  Input/ output bytes that can be declared?
5. CODESYS Profinet Device - Max number of  Input/ output bytes that can be declared?
6. CODESYS TCP/UDP Function blocks - Max packet size?
7. CODESYS MQTT - Max packet size?  ( I have seen Solved: adjust Maximun packet size in the parameter list (boschrexroth.com) but it wasn't clear if there was any restriction)

[TheCodeCaptain]

Hi,

point 6, I tried it and got a max number of 65507 Bytes for UDP.