allscott
Member
- Join Date
- Jul 2004
- Posts
- 1,332
This is going to sound like kind of a dumb question. I am dealing with a proximity switch that is switching too fast for my PLC to see. It is skipping pulses occasionally.
I plan on fixing the problem with a pulse extender, this one to be precise.
http://www.balluff-ua.com/pdf/KT_PulseExtender_EN.pdf
Can I assume that if I can see the light on the prox switch on and off that the output of the sensor is also switching at the same rate? I assume the circuitry that turns the light on is part of the circuitry that also switches the output.
I can physically see the output switching on the prox every time but when I monitor in my PLC I miss the odd one as the process speeds up (PLC 5). The application is a single pulse on a wheel that is turning up to about 1 pulse/second max. The scan time of the plc averages about 50ms. The input is a regular 24VDC input on RIO. I thought things would be fast enough when I installed this prox but I was wrong.
Any other advice other than what I am planning?
I plan on fixing the problem with a pulse extender, this one to be precise.
http://www.balluff-ua.com/pdf/KT_PulseExtender_EN.pdf
Can I assume that if I can see the light on the prox switch on and off that the output of the sensor is also switching at the same rate? I assume the circuitry that turns the light on is part of the circuitry that also switches the output.
I can physically see the output switching on the prox every time but when I monitor in my PLC I miss the odd one as the process speeds up (PLC 5). The application is a single pulse on a wheel that is turning up to about 1 pulse/second max. The scan time of the plc averages about 50ms. The input is a regular 24VDC input on RIO. I thought things would be fast enough when I installed this prox but I was wrong.
Any other advice other than what I am planning?