Siemens SIMATIC S7-300 Manual page 215

9.3.2 Single functions (job no. 10)
Overview
You can use this function to transfer single settings to the FM 354 and acti-
vate the corresponding functions. These settings are:
Callup of single
The individual functions remain activated until they are reset.
settings
Length measure-
Since both functions use the same digital input on the FM 354, only one
ment, inprocess
function can be executed at a time. In double activations, both functions are
measurement
switched to inactive. An error message is issued.
For function description, see Section 9.3.10
Retrigger
A precondition for retrigger reference point is that the axis has been synchro-
reference point nized by reference point approach.
With this setting, the axis is synchronized at each positive edge of the zero
mark, after leaving the reference-point switch (RPS) in the direction of the
zero mark (direction as in Reference-Point Approach). Regardless of the
instantaneous speed, at this moment the reference-point coordinate is
associated with the current actual position, taking any active shift into ac-
count.
The resulting change in the actual value causes no internal changes in the
target.
When crossing the RPS, a signal length of ∆t
sured!
When a Set Actual Value On-the-Fly is pending, activation of Retrigger Ref-
erence Point is interlocked.
FM 354 Servo Drive Positioning Module
Length measurement
Inprocess measurement
Retrigger reference point
Switch off enable input
Follow-up mode
Switch off software end position monitoring
Switch off automatic drift compensation
Servo enable
Parking axis
Simulation
Description of Functions
2 FM cycle must be as-
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