"Measuring Input" Technology Object; General Information - Siemens SIMATIC S7-1500 Manual

5 "Measuring Input" Technology Object

5.1 General information

"Measuring Input" Technology Object
5
5.1 General information
The measuring input technology object is used for the highly precise detection of
axis positions based on external switching signals.
Figure 5-1 "Measuring input" technology object – selecting the detection
The detection of the external switching signal can be performed in the following
ways:

Using TM Timer DIDQ
Via the TM Timer DIDQ technology module of the ET200SP or ET200MP
distributed I/O system, the external switching signal is detected and provided
with a time stamp. On the basis of this time stamp, the current position of the
axis to be measured is then determined in the SIMATIC controller and provided
via the technology object.

Using SINAMICS measuring inputs
If digital inputs of the control unit (CU) of the SINAMICS drive system are
configured as measuring inputs and if these measuring inputs are not assigned
to any drive connected to SINAMICS (global measurement), the switching
signals detected on these inputs are also provided with a time stamp and
transferred to the SIMATIC controller. From this, the SIMATIC controller can
then determine the desired position value of the axis to be measured.

Using the PROFIdrive frame
If digital inputs of the control unit (CU) of the SINAMICS drive system are
configured as measurement inputs, but the axis to be measured on the
SINAMICS is connected to the same CU (local measurement), the time stamps
of the switching signals are then processed within the CU of the SINAMICS.
The determined position value is then directly transferred to the SIMATIC
controller via the drive frame and provided to the user program via the
measuring input technology object.
The following functions can be selected to evaluate the external switching signal:

Measurement of rising edge of the switching signal.
With this, for example, the beginning of a passing through object can be
detected.

Measurement of the falling edge of the switching signal.
With this, for example, the end of a passing through object can be detected.
TOs of S7-1500(T)
Entry ID: 109743134, V1.0, 05/2017
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