Measured Values - Siemens SIMATIC FM 353 Manual

Description of Functions
9.3.10

Measured values

Prerequisites
The following prerequisites must be fulfilled to execute the "Measuring" function:
1. Connect a bounce-free switching-signal encoder (sensing probe) to a digital
output of the FM 353.
2. Parameterize "Measurement" for this input in MD34.
Activating the measuring function
The "Individual settings" function (AW-DB, DBB34 and 35) can be used to activate
a "length measurement" or "in−process measuring".
Because both functions use the same digital input of the FM 353, only one function
can be performed at a time. If both functions are activated at the same time, both
functions are deactivated, and an error message is output.
Function description
Measurement functions can be executed in all modes. An executed measurement
is signaled by the checkback signal "ME" and optionally also by a process inter-
rupt.
Inprocess measurement
The present actual position is captured at each rising edge of the touch probe. At
the same time, the axis movement is interrupted (servo-controlled braking).
Measurement taking place
Inprocess measurement On
Measurement input
Process interrupt
S1 − execution of measurement
9-52
S1
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0