Description of Functions
9-62
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0
Rotary axes are subject to certain restrictions in the choice of gear ratio, as shown
in Figure 9-5. These restrictions arise from the need to reproduce the actual posi-
tion accurately over several revolutions when referencing with one periodic zero
pulse per motor revolution (type of reference point approach < 4). See also “De-
pendencies”, Section 5.3.1).
Type of reference point approach?
MD18 4 MD18 < 4
Any rotary axis cycle
Condition:
S
RA
= nS
SZ
n = 1, 2, 3
Examples:
Rotary axis cycle S
RA
Stepper motor cycle S
SZ
Fig. 9-5 Restriction for rotary axis cycle
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