mitsibishi ramped analogue output

alexmcsheffrey · Jul 19, 2013

HI
I am looking at providing a ramped output from a fx3u-4da.I have looked at the ramp function which works on number of scans to the set value. What I require is a variable ramp up and ramp down time to/from a setpoint. Anybody got any ideas of the best way to achieve this?

dploof23 · Jul 19, 2013

I am doing this with a FX3U CPU and FX3U-4DA anaolg output module controlling a hydraulic clamp. The RAMP command is precisely what you want. Find out what your total scan time is and with a little math in the PLC or HMI, you can scale a time input to the proper number of scans and dump that into a data register to use in the ramp command.

Hope this helps,

Dave

alexmcsheffrey · Jul 20, 2013

hi the only problem with that is there is a limit of the number of scans you can enter

alexmcsheffrey · Jul 20, 2013

I need a 180 second ramp

dploof23 · Jul 20, 2013

alexmcsheffrey said:
I need a 180 second ramp

I think you can achieve this by setting a constant scan time. I will attach a snip of the FX3U programming manual talking about this in regards to the RAMP command.

Hope this helps,

mitsibishi ramped analogue output

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