Siemens SIMATIC ST-1500 Function Manual page 117

Using the High_Speed_Counter technology object
3.5 Configuring the High_Speed_Counter
Time base for velocity measurement
This parameter defines the time base on which the velocity is to be returned.
You can select from the following options:
● 1 ms
● 10 ms
● 100 ms
● 1 s
● 60 s/1 min
The default setting is "60 s/1 min".
Increments per unit
You can use this parameter to define the number of count pulses per relevant unit that the
incremental or absolute encoder supplies for the velocity measurement.
The number of count pulses depends on the configured signal evaluation. You can enter a
value between 1 and 65535.
Example 1:
You encoder delivers 4000 count pulses for travel over one meter. The velocity is to be
measured in meters per second. "Double" is configured as signal evaluation.
In this case, you need to assign the following parameters:
● Increments per unit: 8000
● Time base for velocity measurement: 1 s
Example 2:
Your encoder delivers 4096 count pulses per revolution. The velocity is to be measured in
revolutions per minute. "Single" is configured as the signal evaluation.
In this case, you need to assign the following parameters:
● Increments per unit: 4096
● Time base for velocity measurement: 60 s/1 min
116
Counting, measurement and position detection
Function Manual, 12/2017, A5E32009889-AG