I have a Coriolis and Turbine flow meter that is powered externally (120VAC) and provides a 4-20mA analog signal via an XRT converter. I need to connect this signal to an Allan Bradley 1756-IF8H module. Should I still loop it to the power supply, or can I simply connect the two wires directly from the flow meter to the AI card's IN+ and IN- terminals?
Many electronic devices offer the option to select between passive or active analog signal settings. Consult the user manual of your device to determine if this option is available. Refer to page 35 of the manual (1756-UM533F-EN-P) for instructions on wiring the device to the card.
Thank you for your feedback. My Coriolis model indicates a 4 to 20 mA HART output (Option BA for Proline Promass F300) with an external supply of 120VAC. According to my understanding, the PLC catalogue does not provide specific guidance on wiring in this scenario. I believe I simply need to connect the two wires of the 4-20mA output directly to the PLC, without any connection to the 120VAC supply. Any advice on this setup would be greatly appreciated.
It seems likely you are correct, but without specifying the part number or name of the flowmeter, it is challenging to determine if the output is active or passive. This information is crucial for understanding the functionality of the flowmeter.
In response, Osaid expressed gratitude and provided details about their Coriolis model, which specifies a current output of 4 to 20 mA HART (Option BA for Proline Promass F300) with an external supply of 120VAC. While the PLC catalogue does not offer specific wiring instructions for this scenario, Osaid's understanding is to simply connect the 4-20mA two wires directly to the PLC without looping them to the 120VAC. It is recommended to refer to the manual (1756-UM533F-EN-P) for the card to ensure correct wiring, which may involve connecting to IN+ IN- and placing a jumper between IN- and the I RTN terminal. As Osaid has not personally wired this module before, it is advised to read the manual for accurate instructions.
Parky accurately pointed out that without specifying the part number or name of the flowmeter, it is difficult to determine if the output is active or passive. Thank you for your response, I have included the acquired model: Promass F300 (CDEBAGAD). This information will help provide clarity on the flowmeter's functionality.
Having worked with this type of setup before, you can indeed connect the two wires from your flow meter directly to the Allen Bradley 1756-IF8H module's IN+ and IN- terminals. The analog signal from the flow meter should be translated effectively this way. However, remember to do proper grounding as Allen Bradley equipment is notorious for being sensitive to ground loop issues. Still, you should verify the configuration of your application with your controls engineer to ensure flawless integration. Safety first!
You're correct in the setup you're suggesting. Using a 4-20mA signal, you can indeed hook up the two wires from your flow meter directly to the 1756-IF8H AI card’s IN+ and IN- terminals. A 120VAC power separately powering the flow meter doesn't affect this since the 4-20mA current loop is the form of output. Just make sure you're following the correct wiring sequence and safety procedures to prevent any damage to your devices.
When connecting your flow meter to the Allen Bradley 1756-IF8H module, you should ensure that the 4-20mA signal is correctly referenced to the same ground as your AI module to avoid any potential discrepancies or noise issues. Typically, you can connect the output directly to the IN+ and IN- terminals on the AI card, but pay close attention to grounding. It's also a good practice to loop the signal through the power supply if that means stabilizing the system. Just be cautious of the power requirements and ensure everything is properly isolated to protect your equipment.
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Answer: 1. Can I connect a Coriolis flow meter's 4-20mA signal directly to an Allan Bradley 1756-IF8H module without looping it to the power supply? - Yes, you can connect the two wires directly from the flow meter to the AI card's IN+ and IN- terminals without looping it to the power supply.
Answer: - The Coriolis and Turbine flow meters are powered externally with 120VAC.
Answer: - Yes, you need an XRT converter to provide a 4-20mA analog signal for connection to the AI card's IN+ and IN- terminals.
Answer: - Yes, the Allan Bradley 1756-IF8H module can receive and process the 4-20mA analog signal from the Coriolis flow meter effectively.
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