MicroLogix-1200-to-PowerFlex-4-Modbus

My first sample program is based on the example in the appendix of the  22-SCM-232 Manual.

After unsuccessfully attempting to get an electronic copy from Rockwell Drives Tech Support, I broke down and typed in all the ladder and comments myself.

Once setup and testing was completed I added additional comments to the first run.

Requirements:

  • RSLogix 500 Version: 6.1
  • Additional Requirements: Micro1200 & PF4/40
  • File Size: 61 kb
  • Uploaded on: 02/09/04
  • Entered By: Shawn Michael Tierney

My second program is based on the first, but uses the Modbus Master protocol available in the latest release of the MicroLogix 1200, as well as a 1761-Net-AIC.

The biggest obstacle in getting this configuration to work was trying to find the polarity of the comm lines (i.e. does + comm on the AIC go to A or B comm on the drive?) as well as realizing all the modbus addresses are offset by 1 (which even Rockwell Drives Div. missed in Rev 1 of the subsequently release tech note).

Since this file was published, Rockwell has release (and fixed) a tech note, and also has an excellent 2004 HOT LAB.

Requirements:

  • RSLogix 500 Version: 6.1
  • Additional Requirements: Micro1200 & PowerFlex 4 /40
  • File Size: 60 kb
  • Uploaded on: 02/09/04
  • Entered By: Shawn Michael Tierney

Download Link:

Until next time, Peace ✌️ 

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Shawn M Tierney
Technology Enthusiast & Content Creator

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