Rotational Speed Measurement; Table 2-11 Calculation Of The Integration Time - Siemens SIMATIC ET 200S Operating Instructions Manual

1Count24V/100kHz
2.7 Measurement Modes
2.7.5

Rotational Speed Measurement

Definition
In rotational speed measurement mode, the 1Count24V/100kHz counts the pulses that arrive
from a rotary encoder within a set integration time and calculates the speed of the connected
motor.
Integration Time
You preset the integration time with the Integration Time parameter (see table).
Table 2-11 Calculation of the Integration Time
Boundary conditions
Non-isochrone mode
Isochrone mode
Any digits after the decimal point that come about after dividing by T
1
These limits must not be violated. If these limits are violated, the 1Count24V/100kHz generates a parameter assignment
error and will not go into isochrone mode.
Rotational Speed Measurement
For rotational speed measurement mode, you also have to assign the pulses per encoder or
motor revolution.
The rotational speed is returned in the unit 1x10
Figure 2-25
64
Integration time
Any T n x 10 ms
DP
T < 10 ms n x T
DP
T ≥ 10 ms n x T
DP
Rotational Speed Measurement with Gate Function
Range of n
n
min
1
(10 ms/T [ms]) + 1
DP DP
1
DP
are omitted.
DP
/min.
-3
Operating Instructions, 02/2007, A5E00124867-05
n
max
1000
1000
1
10000 ms/T [ms]
DP
Technological Functions
1