Schmitz Posted April 18, 2012 Report Posted April 18, 2012 Hello. Is there a way to use the same instruction to read bits through Modbus protocol on both Premium and Quantum models? I'm trying to use on Quantum a Derived Function Block that already works on Premium and uses the READ_VAR instruction. So far I have just found the CREAD_REG instruction available on Quantum, that (as the name implies) reads contiguous registers. Thanks in advance. Quote
billysmithde2 Posted April 20, 2012 Report Posted April 20, 2012 I think you want a MBP_MSTR block. Recent firmware versions on the NOE show a change that allow them to use any Modbus function code. If your are using a CoPro model then not sure... it might have already supported it. Note with this block you will have to code the modbus message yourself. It's generally pretty easy, but post here if it is not obvious how to create the request beffer. Quote
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.