Single Functions (User Db, Dbb34 And 35) - Siemens SIMATIC FM 353 Manual

Description of Functions
9.3.2

Single functions (user DB, DBB34 and 35)

Overview
You can use this function to transfer single settings to the FM 353 and activate the
corresponding functions. These settings are:
S Length measurement
S Inprocess measurement
S Retrigger reference point
S Switch off enable input
S Switch off software end position monitoring
S Servo enable
S Rotation monitoring
S Parking axis
S Simulation
Callup of single settings
The individual functions remain activated until they are reset.
Length measurement, in-process measurement
Since both functions use the same digital input on the FM 353, only one function
can be executed at a time. In double activations, both functions are switched to
inactive. An error message is issued.
For function description, see Section 9.3.10
Retrigger reference point
A precondition for retrigger reference point is that the axis has been synchronized
by reference point approach.
With this setting, the axis resynchronizes upon overrunning the synchronization
point when the direction of travel is the same as the direction of reference point
approach. Regardless of the current speed, the reference point coordinates are
allocated to the current actual position, taking into account any active shift.
When overrunning the reference point switch, a signal length of ∆t w 2@FM
cycle must be ensured!
The resulting change in the actual value causes no internal changes in the target.
When a Set Actual Value On-the-Fly is pending, activation of Retrigger Reference
Point is interlocked.
9-42
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0