Hello, I am in the process of researching current sensors for a project and I am interested in integrating them with my Siemens 1200 PLC. The goal is for the current sensor to detect prolonged spikes in current and for the PLC to halt certain motors when this occurs. While exploring the TIA portal, I discovered that in the 'General' section, the parameters for these analog inputs are set as "Measurement type: voltage" and are currently locked and inaccessible (see image attached). Does this indicate that I need to acquire a separate analog input module specifically for current measurement? Any guidance on this matter would be highly valued. Thank you.
I am under the impression that the integrated artificial intelligence (AI) feature on the S7-1200 is optimized for 0-10v applications.
Rob stated that the integrated AI of the S7-1200 is limited to 0-10v operations. I concur with this observation. While the AI cards and signal board may offer some flexibility, it may not match the capabilities of the ET200SP. I highly recommend exploring the technical specifications for more information.
You can enhance your system by utilizing additional modules or signal boards on the front that are compatible with 4-20mA or other signals. Most of the individual AI/AO cards can be easily configured in the HW settings for varying ranges such as 0-10 or 4-20.
If you wish to connect 0-20mA sensors to a voltage input, simply incorporate a 500ohms resistor for conversion. Alternatively, you can utilize a converter module for a more efficient setup. In this tutorial, we will guide you on connecting an analog sensor, such as the WIKA A-10 pressure sensor, to a RevPi MIO module. This sensor operates on a 2-wire, 4-20mA system and we will provide a comprehensive explanation on how to establish the connection with the PLC for data processing. Visit plctalk.net for more information.
Indeed, your observation is quite accurate. In most cases, the Siemens 1200 series PLC analog inputs are set by default to measure voltage, as you rightly stated. Therefore, to measure current, you would need current to voltage transducer or a different analog input module that can measure current directly. I suggest reviewing the specific PLC's manual to see if it's possible to change the measurement type in the TIA portal; otherwise, getting a separate analog input module for current measurement would be the appropriate solution. You might also want to look into current-transducing sensors that provide a voltage output, which your existing system could read without requiring additional hardware. It can save quite a bit on costs. Good luck with your project!
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Answer: Answer: The reason the analog inputs are set as "Measurement type: voltage" and locked in the TIA portal is because the default configuration might not support direct current measurement. It may indicate that a separate analog input module specifically designed for current measurement is required.
Answer: Answer: To unlock and configure the analog inputs for current sensor integration, you may need to acquire a suitable analog input module that supports current measurement. This module can then be connected to the PLC to enable accurate current sensing and integration.
Answer: Answer: To set up current sensors to detect prolonged spikes and trigger actions in the PLC, you need to ensure you have the correct analog input module for current measurement. Then, configure the analog inputs in TIA portal to receive and process the current sensor data. You can program the PLC to monitor the current values and trigger actions such as halting motors when spikes are detected.
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