Hi,
I have the 1734-IJ 5V DC Module connected to my allen bradley PLC.
My current hardware outputs a 5V DC Square wave and I want to read the frequency.
My current settings are as followed:
Type - Rate Measurement
Frequency Precision - X1
Gate Multiplier - 1
Time Base - 250 ms
Filter - 50kHz
Filter A - Checked
Filter B - Checked
Filter Z - Checked
When I output a 40kHz square wave signal into the A, the PLC reads PresentData reads ~19kHz, which is wrong
I did confirm with a DMM that the source is outputting 40kHz, it is just the 1734-IJ is not reading it properly...
If I change my output to say 30kHz, the PLC reads ~30kHz, which is correct.
It would appear to be read wrong whenever I go beyond 38kHz
Now if I chose to pick "No Filter", I can read 40kHz but the precision is not what I want...
What am I doing wrong? And is there anything I can do to improve the precision?
I have the 1734-IJ 5V DC Module connected to my allen bradley PLC.
My current hardware outputs a 5V DC Square wave and I want to read the frequency.
My current settings are as followed:
Type - Rate Measurement
Frequency Precision - X1
Gate Multiplier - 1
Time Base - 250 ms
Filter - 50kHz
Filter A - Checked
Filter B - Checked
Filter Z - Checked
When I output a 40kHz square wave signal into the A, the PLC reads PresentData reads ~19kHz, which is wrong
I did confirm with a DMM that the source is outputting 40kHz, it is just the 1734-IJ is not reading it properly...
If I change my output to say 30kHz, the PLC reads ~30kHz, which is correct.
It would appear to be read wrong whenever I go beyond 38kHz
Now if I chose to pick "No Filter", I can read 40kHz but the precision is not what I want...
What am I doing wrong? And is there anything I can do to improve the precision?