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9 Standard reference modes overview + + 0 1 0 (6) 1 (7) 12 13 18 19 2 3 8 9 14 15 20 21 4 5 10 11 16 17 22 23 = resolver zero position = reference sensor = positive direction = negative direction = automatic direction selection = reference point shifting 9.1 Reference run and modes The reference run of the axis is always necessary when there must be a fixed relationship between the electrical and the mechanical zero point of the axis, e. g. with a rotary axis with a tool or a linear axis. In order to be able to solve this task flexibly, 24 standard reference modes are offered. These are explained in the following text. 38 Product manual Model: Profibus DP 07-05-04-02-E-V0801.doc