linuxcnc 4-20mA driver solutions
- robertspark
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17 Apr 2021 08:55 #206164
by robertspark
linuxcnc 4-20mA driver solutions was created by robertspark
I have a 4-20mA device (250ohm), and I was wondering if there are any hardware solutions available to drive 4-20mA devices?
I am fairly ofay with 4-20ma control, and can fabricate something, I was just wondering if anyone knew of a linuxcnc hardware solution (like a Mesa board or something)
thanks in advance
I am fairly ofay with 4-20ma control, and can fabricate something, I was just wondering if anyone knew of a linuxcnc hardware solution (like a Mesa board or something)
thanks in advance
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19 Apr 2021 12:07 #206377
by andypugh
Replied by andypugh on topic linuxcnc 4-20mA driver solutions
The simplistic answer might be analogue 0-10V out through a 5k resistor (with an offset applied in HAL to give 4mA for 0 input). That isn't a very good current loop, but if the device is driven by a PID that might compensate.
Otherwise I guess that an off the shelf current-loop driver IC is the way to go. For simplicity this would probably be driven by one of the LinuxCNC analogue output devices, though SPI or similar feel like they should be possible.
Otherwise I guess that an off the shelf current-loop driver IC is the way to go. For simplicity this would probably be driven by one of the LinuxCNC analogue output devices, though SPI or similar feel like they should be possible.
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