Counter/Frequency with detection of rotation direction
Application Note
English
Description
Application
Measuring input
Input cable
Note
Event counter as upwards/ downwards counter
Frequency measurement with detection of rotation direction
M-CNT2
600-858
SIM-CNT-IN Cable open (Lemo 1B 7-pin)
670-858
SIM-CNT-IN Cable open (Lemo 1B 7-pin)
Sensor output signals S1/S2 are proportional to Rpm or speed with a
phase shift of 90° between S1 and S2.
To detect the rotating direction, a second input of M-CNT2 is required;
means: S1 > Input1, S2 > Input2, respective S1 > Input3, S2 > Input4
Basic principle
Wiring diagram
Subject to change
IPETRONIK GmbH & Co. KG
ipetronik.com
2014.07
Counter/Frequency with detection of rotation direction
Application Note
Software settings
Format
CAN data format
Data type
16 Bit or 8 Bit signed/unsigned
Setting, e.g.:
16 Bit signed
NoValue
Set invalid value resp. range boundary, which is indicated as error
(-FullScale, 0, +FullScale)
Setting, e.g.:
-FullScale
Scaling
Input signal scaling
Mode
Frequency, Frequency with direction,
Duty cycle, Period duration, Pulse duration, Pause duration
Event counter, Event counter with direction
Setting, e.g.:
Frequency with direction
Sensor range
Up to 200 kHz (200 s) user selectable range
Setting, e.g.:
Min: -100 Hz, Max: 100 Hz
Physical range
Scaled value
Setting, e.g.:
Min: -6000 rpm, Max: 6000 rpm
Display
Display settings (IPEmotion View area)
Displaying area
Physical range used in diagrams (Yt, bargraph) of visual elements
Formatting
Number of decimal places used for the physical range
Setting, e.g.:
1 decimal place > 4500.0 rpm
(Display setting! This does not affect the system accuracy!)
Name
Name used for the visual element.
Subject to change
IPETRONIK GmbH & Co. KG
ipetronik.com
2014.07
Counter/Frequency with detection of rotation direction
Application Note
Input signal
Settings for signal evaluation
Signal parameters
Threshold on
Threshold off
Edge
DC compensation
Start trigger to calculate frequency/period duration/events
Stop trigger to calculate frequency/period duration/events
Signal evaluation between rising or falling edges
enables the compensation of the DC share of the input signal
Zero detection threshold
Gate time
Minimal value
Maximum time (timeout) allowed to be used for evaluation (threshold on,
threshold off). Without any signal detection during this time period, the
minimal value, resp. 0 is output by the system.
Physical value that is indicated in case of gate time exceeding
(evaluation not possible).
Excitation
Sensor supply voltage
Sensor excitation
Sensor supply voltage
Setting, e.g.:
12.5 V
Filter
Low-pass filter at the signal input
Hardware filter
Up to 30 kHz user selectable antialiasing filter of the channel
Averaging
Block mean value calculated based on acquired data within the sample
period at an internal sample rate of 5 kHz.
Example:
Module sampling rate (= output rate to CAN bus) = 100 Hz
Averaging calculated based on 5000 Hz / 100 Hz = 50 values
Subject to change
IPETRONIK GmbH & Co. KG
ipetronik.com
2014.07