这是我摘录的英文解释，应该比较清楚吧，呵呵

1: A modulo conversion is performed on the setpoints for the rotary axis.
The software limit switches and the working area limitations are
ineffective; the traversing range is therefore unlimited in both
directions.
MD: ROT_IS_AX must be set to "1"
0: No modulo conversion
MD irrelevant for: MD: IS_ROT_AX = "0" (linear axes)
Related to:
MD: DISPLAY_IS_MODULO "Position display is modulo 360°"
MD: IS_ROT_AX = 1 "Rotary axis"
MD: POS_LIMIT_MINUS "Software limit switch minus"
MD: POS_LIMIT_PLUS "Software limit switch plus"
SD: WORKAREA_LIMIT_MINUS "Working area limitation minus"
SD: WORKAREA_LIMIT_PLUS "Working area limitation plus"