Steve Cheung
Member
Dear All,
Any one can help my problem?
We have a project that need to count the pulse of the Flasher Relay at QC production line.
For example the pulse measure: ON is about 0.378 second. The pulse OFF is about 0.745 second.
The Pulse voltage is 0 - 10VDC.
I was choose the FX2N PLC using timer T246 1 ms timer to measure the pulse. It work, but seem it not precision.
The measure pulse always more or sometime less. It's make me confuse, is it because of the Scan time or not, but the program is only 100 address more.
For example the machine show 0.377s, but our FX2N measure 0.379s or sometime 0.376s, always change, not stable. (The existing machine have it PC base system that show the pulse count. Our FX2N is additional system is compare to measure the existing PC base system.)
Anyone that can give me a smart solution in a system or ladder sample?
Thank you & I waiting for you reply early.
Best regards
Steve
Any one can help my problem?
We have a project that need to count the pulse of the Flasher Relay at QC production line.
For example the pulse measure: ON is about 0.378 second. The pulse OFF is about 0.745 second.
The Pulse voltage is 0 - 10VDC.
I was choose the FX2N PLC using timer T246 1 ms timer to measure the pulse. It work, but seem it not precision.
The measure pulse always more or sometime less. It's make me confuse, is it because of the Scan time or not, but the program is only 100 address more.
For example the machine show 0.377s, but our FX2N measure 0.379s or sometime 0.376s, always change, not stable. (The existing machine have it PC base system that show the pulse count. Our FX2N is additional system is compare to measure the existing PC base system.)
Anyone that can give me a smart solution in a system or ladder sample?
Thank you & I waiting for you reply early.
Best regards
Steve