text: <s>[INST] PowerFlex 525 - Parameter 105 and STO function If I change the parameter 105 (Safety Open En) from fault enable (Factory setting) to fault disable does this also disable the STO function of the VFD or does this only disable the fault F059 of the VFD? [/INST] http://literature.rockwellautomation.com/idc/groups/literature/documents/um/520-um001_-en-e.pdf Page 100 of the user's manual describes the function of parameter 105. Unfortunately, it's a bit ambiguous even for me. I read this as parameter 105 deciding between Normally OPEN and Normally CLOSED contacts of the safety input. Page 235 begins the description of the safe-torque-off function. Page 239 shows the wiring. The drive ships with a jumper installed on the STO terminals. If you leave the default setting of parameter 105 as is, and leave the jumper installed, then STO function is effectively disabled. \\n </s>