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Technical support / TMD low frequency measurement
« on: March 07, 2009, 08:59:02 AM »
Hi,
I have a T100MD trying to evaluate if it will fulfill all our needs.
I have a query on measuring frequency.
I will be connecting the output pulses from a flowmeter to the PLC and would like to measure the frequency to determine the flow.
Problem is that the frequency is pretty low, from 0.16Hz at low flow to 13.9Hz at high flow.
Can the PLC measure such low frequencies using the pulsefrequency facility?
What is the resolution of measurements?
If pulsefrequency will not do it, is there a better way, using PLC? Or do I have to start looking at ways of increasing the pulsetrain frequency externally?
Any help appreciated.
I have a T100MD trying to evaluate if it will fulfill all our needs.
I have a query on measuring frequency.
I will be connecting the output pulses from a flowmeter to the PLC and would like to measure the frequency to determine the flow.
Problem is that the frequency is pretty low, from 0.16Hz at low flow to 13.9Hz at high flow.
Can the PLC measure such low frequencies using the pulsefrequency facility?
What is the resolution of measurements?
If pulsefrequency will not do it, is there a better way, using PLC? Or do I have to start looking at ways of increasing the pulsetrain frequency externally?
Any help appreciated.