bobnorway Posted April 28, 2012 Report Share Posted April 28, 2012 Using Visilogic V9.4.0 running WINXP sp3 . V1040 with V200-18-E6B Re-installed visilogic software, updated operating system on V1040, created a new empty project, no change. The V1040 has a 24vdc supply. The problem is that the 4-20ma analog outputs (both channels) seem to be limited to about 10volts. This gives me a maximum loop resistance of 50ohms not the 500ohms stated in the manual. It would 'appear' that some software from a 0-10volt output is limiting the 4-20ma. Test it yourself: hang a 100ohm load and set the channel for 4095 decimal. This should work and give 20ma = 20volts but it doesn't, it'll stop at 11volts. Quote Link to comment Share on other sites More sharing options...
MVP 2023 Joe Tauser Posted April 28, 2012 MVP 2023 Report Share Posted April 28, 2012 Umm... 500 ohms x 0.020 amps = 10V. My calculator says so, and it agrees with the point of your post. 50 ohms would give you 200 mA at 10V. Joe T. Quote Link to comment Share on other sites More sharing options...
AlexUT Posted April 29, 2012 Report Share Posted April 29, 2012 Hi, Maximum load for current output is 500 ohm. As Joe say, for 20 mA output current voltage at 500 oHm resistor is: V=R*I, V=500*0.020=10V. It never will be more. And for 100 oHm resistor voltage should be 2V. Quote Link to comment Share on other sites More sharing options...
bobnorway Posted April 30, 2012 Author Report Share Posted April 30, 2012 I'm embarassed. My brand new box of 100ohm resistors is full of 1Ks. Ohm's law rules here also. Quote Link to comment Share on other sites More sharing options...
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