Siemens SIMATIC FM 353, Manual

Page: 243 / 361

Description of Functions
9-43
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0
RPS
− +
Zero pulse
Start Target
Reference-point switch input of the FM 353
Zero pulse for
synchronization
Hint to the user:
You can use Retrigger Reference Point, for example, to compensate for slippage
of the trolley in a high-bay warehouse during operation, without having to resyn-
chronize the axis with the Reference-Point Approach mode. When retriggering in
reference point approach with a zero pulse, be careful that the total slippage be-
tween the reference point switch and the stepper motor does not become so great
that the synchronizing zero pulse migrates to an “adjacent” zero pulse!
Switch off enable input
With the “switch off enable input” function, you can switch off evaluation of the en-
able input (see Section 9.8.1).
Deactivate end position monitoring
You can use this function to deactivate monitoring of the software limit switches
(see Section 9.9).
It can be switched on or off only if “Processing in progress” = 0.
Rotation monitoring
Rotation monitoring is performed in all operating modes. It is automatically inter-
rupted as the synchronization mark is passed in “Reference point approach” mode
and in “Retrigger reference point” function.
The “rotation monitoring” function is described in Section 9.7.3.
Servo enable
You can use this function to:
S Activate the control function “Positioning”
S Switch the signal through to the drive as indicated in MD37