Thank you all for responding so quickly!
I have looked up the code 77 and also 78 on Google.
Quick Steps
[FONT="]1. [/FONT]Open the 1756-DNB program and find the properties tab
[FONT="]2. [/FONT]Select the scan list tab
[FONT="]3. [/FONT]Click on the Node that is reporting the error
[FONT="]4. [/FONT]Click the Edit I/O parameters button on the lower left-hand side of the screen
[FONT="]5. [/FONT]Dialog box opens to Edit the I/O parameters
[FONT="]6. [/FONT]The Dialog Box contains 3 sections: Strobed, Polled, or Change State/Cyclic
[FONT="]7. [/FONT]At the Lower Right corner of Dialog Box click the Restore I/O Sizes Button
[FONT="]8. [/FONT]Watch on the Dialog box that the section labelled Polled doesn’t become automatically checked.
[FONT="]9. [/FONT]If the Polled section I/O sizes do not match the Change State/Cyclic section displayed I/O sizes. Toggle the I/O sizes up or down in the polled section to match the I/O sizes in the Change State/Cyclic section.
[FONT="]10. [/FONT]The Scanner Configuration box will appear select YES
[FONT="]11. [/FONT]Return to the Scan List, verify Automap on Add does not have a checked box.
[FONT="]12. [/FONT]Repeat the Check and Map process I/O sizes for both input and output tabs.
[FONT="]13. [/FONT]Toggle to the select start Dword for correct node
[FONT="]14. [/FONT]Select Automap and select OK
[FONT="]15. [/FONT]The Scanner Configuration box will appear select YES (to download changes to device)
[FONT="]16. [/FONT]Verify the machine condition is either cycle stopped or idle mode
[FONT="]17. [/FONT]The Scanner Configuration box will re-appear select YES.
[FONT="] [/FONT]
I found a procedure for the elimination of such(error 77), however I can not seem to get rid of the error.
As for error 78, I think it was because I placed something ( a device) in the scanlist.
Although I have removed it I still get the error ( perhaps I need to de-power the whole PLC?)
I certainly am open to any and all information I can get on the Ethernet/ Modbus/ DeviceNet since I was thrown into repairing such.
My direct email is:
[email protected]
Thanks again!