Siemens SIMATIC ET 200SP - Page 102

Using the High_Speed_Counter technology object
3.5 Configuring the High_Speed_Counter
Counting, measurement and position detection
Function Manual, 12/2017, A5E32009889-AG
101
Filter frequency
Minimum pulse/break time
200 kHz** (preset for TM Count)
2.0 µs
500 kHz* 0.8 µs
1 MHz* (default at TM PosInput)
0.4 µs
*
Only available with TM PosInput
** * Only available with TM Count and TM PosInput
Sensor type (TM Count)
By configuring the sensor type, you specify how the counter inputs are switched for the
TM Count.
You can select from the following options:
Sensor type
Meaning
Sourcing output
(default)
The encoder/sensor switches the inputs A, B and N to
24VDC.
Sinking output
The encoder/sensor switches the inputs A, B and N to M.
Push-pull (sinking and sourcing out-
put)
The encoder/sensor alternately switches the inputs A, B
and N to M and 24VDC.
"Push-pull" is usually selected when incremental encoders are used. If using 2-wire sensors,
such as light barriers or proximity switches, you need to select the corresponding wiring
"sourcing output" or "sinking output".
The data sheet of the encoder includes information on whether your incremental encoder is
a push-pull encoder.
Note
If you use a push
-pull encoder and the sensor type "Push-pull (sinking and sourcing output)"
is configured, you can monitor the encoder signals for wire break.
Sensor type (Compact CPU)
The "Sourcing output" sensor type is set for the Compact CPU and cannot be changed. The
encoder or sensor switches the inputs A, B and N to 24V DC.
You can operate both sourcing output encoders as well as push-pull encoders on the
Compact CPU. You can find additional information on the sensor type in the data sheet for
the encoder.