text: <s>[INST] Powerflex 525 positioning with encoder option board Summary: Using Powerflex 525 with optional encoder board and positioning over Ethernet communication Has anybody used a Powerflex 525 with and incremental encoder and encoder option board for a positioning application. The Powerflex 525 will also have the dual port Ethernet comm card (E2P) and be on a Device level Ring. I am using RSlogix 5000 V20.03 for programming. The application we will be using this for will have maybe 3-5 positions to goto and will be manually homed. [/INST] I've not used PF525, but have done what you describe with PF755. In the PLC program, they're going to look identical. There are several pitfalls you can avoid. First, though it is documented it is easy to miss the fact that your coarse update time setting in the Motion Group Properties MUST be set higher than 3 milliseconds. The default value is 2 and that will just not work. I've found that even 3 milliseconds is sometimes not large enough. For two axes, we've been setting the Coarse Update time to 8 milliseconds. Next - before you add motor nameplate data or adjust any maximum velocity, tuning, or customize ANYTHING in the axis, you must, Must, MUST make sure the firmware is up to date in the drive entry in the I/O tree. If you change the major firmware setting, if you change the slot in which the encoder card sits, if you do almost ANYTHING in the drive entry in the I/O tree, Logix says that all your careful work setting up the axis in the motion group will be set back to defaults. This has bit me in the ass often (as you can tell from the capitalized words for emphasis). If you have to upgrade the firmware in the drive, you're screwed regardless. Keep daily copies of your program so that when (not if) you have to do a firmware upgrade, you have a reference to what all the settings in the axis were. You're welcome to contact me if you need additional help. \\n </s>