Siemens SIMATIC FM 453, Руководство пользователя

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9-50
FM 453 Servo Drive / Step Drive Positioning Module
C79000-G7076-C453-01
9.3.10 Measured Values
A “length measurement” or “inprocess measurement” can be activated by
calling FC 2 and job no. 10 “single functions”.
Since both functions use the same digital input of the FM 453, only one func-
tion can be executed at a time. In double activations, both functions are
switched to inactive. An error message is issued.
You can read out measured values from the FM 453, in the results from the
execution of the “length measurement” and “inprocess measurement” func-
tions, by calling FC 5.
The following prerequisites must be fulfilled in order to execute the function
“measurement”:
1. Connect a bounce-free switching-signal encoder (touch probe) to a digital
output of the FM 453.
2. Parameterize Measurement for this input in MD34.
Measurement functions can be executed in all modes. An executed measure-
ment is signaled by the checkback signal “ME” and optionally also by a pro-
cess interrupt.
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 brak-
ing).
S1
Inprocess Measurement On
Measurement input
Process interrupt
S1 – execution of measurement
Measurement taking place
Activating the
Measurement
Function
Reading Out the
Measured Values
Prerequisites
Function
Description
Description of Functions