Compact Logix Address Object Instance ID

[Glenn Vinson]

Hello I am a newbie just starting out trying to develop a VB.net application using EEIP.net dll to communicate with an AB 5370 CompactLogix PLC. I want to use explicit messaging to read and write to a block of memory in the PLC (just need integers, that can be used in the ladder logic by a user). My problem is that I have not found any documentation that shows how the memory is addressed for the Assembly Object for that type of memory or any I/O for that matter. Using Ethernet/IP all the examples show that the AB PLC's use tag paths for the address. Is there a way that the actual Assembly Object address is mapped to a tag inside the PLC? I have searched all over the internet and I am still not sure the best way to do this. Does anyone have any experince using the EEIP.net with AB Compactlogix or Logix family of PLCs that can point me in the right direction?

Thanks,

Glenn

[Jay]

same issue here with a 1756-L55. I wonder if there is a way to cycle through the memory addresses and do a dump of their contents. so far i just get errors.