Description of Functions
9-75
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0
9.7.3 Rotation monitoring
Prerequisites
The following prerequisites must be met for the “Rotation monitoring” function:
1. External zero pulse (NIX) which is generated cyclically, precisely once per mo-
tor revolution
Condition:
At the maximum speed of the stepper motor, a signal length of ∆t 2FM
cycle must be assured for the external zero pulse!
2. Connection to the “Servo message” input of the FM 353’s front panel connector.
3. Parameterization of the external zero pulse (MD37.26)
4. Use of the current-sourcing pattern zero signal is not allowed!
Activation of rotation monitoring
For “rotation monitoring” single function, see Section 9.3.2.
Error message
The following errors are reported:
S Error “Digital input not parameterized” (see Troubleshooting, Table 11-5,
Kl. 3/Nr. 30)
Selecting function without parameterization for NIX
S “Rotation monitoring” error (see Troubleshooting, Table 11-5, Cl. 3/No. 66)
− Motor turns too slowly (during acceleration/travel)
− Motor turns too fast (during acceleration/travel)
− External zero pulse failed
− Incorrect number of increments per motor revolution parameterized (MD13)
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