Re: RTD Simulator
- From: Dennis Mchenney <mchenney@xxxxxxxxxxxxxx>
- Date: Sat, 08 Oct 2005 03:37:03 GMT
Feed two signals into a 2 channel op amp summing amp via voltage followers or gain 1 inverting op amp for each channel, as needed, on each input. Use a 3 sections of quad op amp?
1) Negative Offset pot to take care of the 4 ma baseline. Set one time.
2) Use the 4-20 ma signal to feed a voltage divider resistor string, scaling the voltage output to match the needed RTD signal range over the 4-20 ma input.
Could you use a voltage output configuration from the first PLC instead? Feed a voltage divider to scale as needed. Many PLC A/D I/O can be configured to do this, by channel or card.
There are also din mount signal converter mods to convert 4-20 ma to other V or I signal ranges, but not to RTD that I know as these are inputs.
Dennis
john@xxxxxxxxxxxxxx wrote:
I'm looking for a device/circuit that will take a 4-20mA from one PLC that is being used as a device simulator and convert the 4-20 to the appropriate RTD signal that will be the input to a second PLC under test.
PLC (4-20mA Output) ---> ???? ----> (RTD Input) PLC
I want to dynamically simulate a RTD input into the second PLC for testing purposes.
Thanks for any help.
John
.
- References:
- RTD Simulator
- From: john
- RTD Simulator
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