Jump to content

Recommended Posts

Hi Tejasvini;


The differences between   SI and MI

SI  - System integers  -- used by the PLC Operating system  to provide feedback on system process

          Also Date and time are here.

         Gives status of  Communications ( Modbus and Ethernet and so much more )

        Basically most are read only for programmer to monitor and use in the ladder ( Date and Time can be edited)

Anything starting with   S    SI, SB, SL,SDW   are system   variables.


MI  -- These are for you, the programmer to use in your progam as needed. 

Aslo   MB, ML, DW           --  These are backed up by the Battery, so on power loss, data is retained   ( There is an SB  for Battery Status )

XB,XI,XL  etc  are scratch pad variables for the programmer to use - you don't care if these get wiped on power fail.






  • Like 1
Link to comment
Share on other sites

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.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...