richlinares Posted October 14, 2020 Report Share Posted October 14, 2020 Hello, I have a samba sm43-j-r20 plc using hsc0 connected to the pulse output of a micro motion IFT9703 transmitter. I am supplying 24vdc to the transmitter output as it is passive, same source powering plc, and have been able to simulate and see counts on plc. my problem is that I am seeing extra unwanted pulses when I press buttons I have tied to the inputs and also when ever I engage the output that enables a relay controlling a conveyor motor or any output by that matter. how can i prevent this from occurring so i can see the true pulse output from my transmitter? Thank You RL Quote Link to comment Share on other sites More sharing options...
AlexUT Posted October 14, 2020 Report Share Posted October 14, 2020 Hi, When use mechanical switch, then it's contact(s) "bounce" when fast change it's position. Normal Digital Input has internal filter, which "neutralize" contact(s) bouncing.HSI has no such filters. You can use button on PLC display to start timer and generate fixed length output pulse. Use this pulse as input for high speed counter. Then everything should work as supposed. B.R. 1 Quote Link to comment Share on other sites More sharing options...
MVP 2021 kratmel Posted October 14, 2020 MVP 2021 Report Share Posted October 14, 2020 I recommend to set samba input to npn mode by jamper. In NPN mode you can use only two wire for connect IFT9703. Please note all output coil with 24 VDC must be suppressed via clamp diode. AC coils suppressed via RC - filter. Quote Link to comment Share on other sites More sharing options...
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