Author Topic: PLC to replace rheostat  (Read 12647 times)

can

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PLC to replace rheostat
« on: June 11, 2007, 02:32:56 PM »
Hi guys,

like to find out if 888+ can replace rheostat. Do I use the analogue output to connect to an external device to replace the rheostat?

Regards
Can

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Re:PLC to replace rheostat
« Reply #1 on: June 11, 2007, 05:27:32 PM »
Except for T100MD1616+, all analog output on T100MD+ or T100MX+ PLCs are 0-5V with 8 bit resolution. The output however is high impedance and not meant for driving low impedance load. You could connect the 0-5V to your external device if it accept 0-5V reference voltage. Otherwise you need an amplifier circuit in between to convert the output voltage into other range.

T100MD1616+ has 1 channel of analog output that is 0-20mA. You can use a 250 ohm resistor to convert to 0-5V or 500 resistor to convert to 0-10V and it can drive up to 20mA current at full scale.
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