Can anyone provide guidance on connecting a load cell signal to a Micro850 PLC? The signal ranges from 0mV to 2.001mV. How can I effectively input this mV signal into the PLC system?
In my experience, load cells are typically accompanied by load cell controllers that process the data before sending out an analog signal. I have found that products from Omega and Comptrol are reliable and rarely encounter issues. If your load cell generates a low voltage signal, you can utilize a signal conditioner to amplify it to fit within the PLC input's range.
One effective method is to purchase a signal amplifier with a 4-20 mA output, such as Sensotec, and properly shield the cables while grounding it at the PLC input. You can then utilize a SCP command, or alternatively, use the early SLC500 style. If you're unsure about the specific commands, refer to the documentation. - James
When it comes to load cells, they are more than just a 0-2mV signal. A load cell actually comprises four strain gauges set up in a wheatstone bridge configuration. To properly operate a load cell, an amplifier is necessary to supply excitation voltage and interpret the sense voltage. It's crucial to ensure that the excitation and sense voltages are compatible with the amplifier, typically falling within the 1mV/V to 4mV/V range. For more information on load cell amplifiers, try searching for "load cell amplifier" for assistance.
Considering the low voltage range you've mentioned, you might want to use a signal conditioner that can amplify this mV signal to a more suitable level for your Micro850 PLC, which typically handles 0-10V or 4-20mA. The key here is to choose the right amplifier that can handle load cell signals and ensure it's appropriately calibrated for your specific load cell. After amplification, you could use an analog input module on your PLC to read the signals. Remember to adjust your programming logic to interpret the increased signal as the original mV value, that's how you'll get accurate readings.
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Answer: Answer: To connect a load cell signal to a Micro850 PLC, you will typically need an analog input module that supports the voltage range of the signal.
Answer: Answer: When working with such a low voltage signal, it's important to ensure proper signal conditioning and amplification to accurately interface with the PLC.
Answer: Answer: You may need to use a signal conditioning circuit to amplify and scale the load cell signal to match the input range supported by the PLC's analog input module.
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