4-20mA simulation circuit for PLC

A simple circuit is required to simulate sensor inputs to a PLC. The sensors operate at 12VDC and output a current of 4-20mA. The XTR series devices are being considered for this application, but clarification is needed regarding which model is suitable for 12VDC. Additionally, an output range of 0 to 24mA is preferred to test the PLC input for erroneous signals. The XTR117 is a potential candidate, as it includes a linear regulator, and the input current can be controlled using a potentiometer in series with the regulated 5V output. The XTR116 is also available and may be used instead of the XTR117, but it is important to understand any differences between the two. The XTR116 offers more features, including a more precise reference voltage of 4.096V, while the XTR115 has a 2.5V precision reference. Application diagrams for both XTR117 and XTR116 are available in their respective datasheets, detailing configurations for achieving a 4-20mA output from a 0.8V to 4V input voltage.

The circuit design for simulating sensor inputs to a PLC utilizing the XTR series devices, particularly the XTR116 or XTR117, involves creating a 2-wire current loop transmitter. The XTR116 is advantageous due to its enhanced features, including a precise voltage reference, which can improve output accuracy.

For the circuit, the input voltage range can be set between 0.8V to 4V, corresponding to the desired output current of 4-20mA. The output current can be configured to extend from 0 to 24mA by adjusting the reference voltage and using an offset current. This is achieved by connecting additional resistors and possibly a potentiometer to fine-tune the output.

The XTR116 and XTR117 both support a simple configuration, where the output current is determined by the input voltage applied to the device. The inclusion of a linear regulator in the XTR117 allows for stable operation at 12VDC, while the XTR116 can be configured similarly but may require additional components to achieve the same level of performance.

When designing the circuit, it is essential to consider the power supply requirements, ensuring that the voltage levels are appropriate for the operation of the selected XTR device. The datasheets provide application diagrams that illustrate how to implement the circuit effectively, including the necessary calculations for determining the resistor values needed for the desired output current.

In summary, either the XTR116 or XTR117 can be utilized to simulate sensor inputs for a PLC, with careful consideration of the circuit design and component selection to achieve the desired output characteristics. The choice between the two devices should be based on availability, required precision, and specific application needs.I am looking for a simple circuit to simulate sensor inputs to PLC. Sensors take 12VDC and outputs 4-20mA. I was looking at your XTR series devices which seems to be able to achieve this but I am not sure which one will be ok to use for 12VDC voltage. Also, it would be good to have the range of output from 0 to 24mA rather than 4-20mA so that we c an test the PLC input for error inputs as well. In particular, the XTR117 could be of interest for you, it includes its own linear regulator, and the input current could be generated using the Regulated 5V output in series with a potentiomenter to control the current output value. Thanks for the help Albert! You`re correct that the XTR117 is likely the best candidate for this type of simple circuit to simulate a 2-wire current loop transmitter.

I have seen couple of answers given previously with circuit diagram and components to suit the requirement. Is it possible to get a schematic and calculations If not I have a circuit calculation for XTR116 which was previously posted so I can work with it.

Ifound a XTR116 in lab at my work but XTR117 is not available so I will have to buy it. For my application, if I use XTR116 rather than XTR117 then do I miss out on anything do I need to keep anything else in mind when using XTR116 instead of your suggested XTR117 I have attached files that I found from one of the other questions on ti. com The XTR116 actually has more features than the XTR117, not less. The XTR116 includes everything that the XTR117 includes with the addition of a more precise reference voltage of 4.

096V. The XTR115 is a similar product with a 2. 5V precision reference. Both the XTR117 and XTR116 are fairly easy products to use and full applications diagrams are included in the datasheet. Figure 1 describes a standard application with a 4-20mA output from a 0. 8V to 4V input voltage. Figure 2 shows how to configure the output for 4-20mA with a 0V minimum input by adding an offset current through the voltage reference.

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