I have an Allen Bradley Micro850 PLC that lacks communication capabilities with the Yaskawa V1000 drives in place. I am seeking a solution to convert the analog 0-10vdc signal into a speed reference for calculating the remaining footage on a roll of paper. Although I have the formula for measuring the paper's footage, I need a method to track the remaining amount. How can I convert the analog signal into a speed measurement, considering that the motor's maximum speed at 230VAC is 1450rpm?
You can achieve your goal using the SCL (Scale) function block, located in the "Process Control" tab of the toolbar in CCW. This tool enables you to specify the minimum and maximum values for both the input (e.g. 0-10VDC) and the output (e.g. 0-1450RPM), and generates a scaled value accordingly. I hope this information proves useful to you.
After carefully considering, I have implemented a new scaler to convert the analog input to a "any-to-real" format, setting the range from 0 to 1450. With the analog value at 65535, I am confident that the scaling process will be accurate. Additionally, I will be installing a limit switch on the paper to ensure that any inaccuracies in calculations due to a partial roll are prevented.
There is a high likelihood that the Micro850 is capable of communicating with the Yaskawa V1000 drive via Modbus, whether through Rtu or Tcp protocols. However, there is a slight possibility that this may not be the case.
The Old Man confidently stated that the Micro850 likely has the capability to communicate with the Yaskawa V1000 drive through Modbus, whether using Rtu or Tcp protocols. However, there is always a possibility of being mistaken. Can you provide more information to confirm this statement?
In my experience, I have worked on a system utilizing a Micro8x0 controller for Modbus TCP communication, utilizing a special MSG instruction for this purpose. This controller features a Micrologix serial port with RS232 and RS485 pins, claiming support for Modbus RTU protocol. It is likely that the 1761-NC01 module used with the 1400 could work similarly, although I was unable to find specific information in the reference manual I reviewed. Further investigation is necessary to confirm the pinout for accessing the RS-485 pins. The setup for Modbus RTU communication and control on Yaskawa drives has been consistently similar in my experience. I believe there is a high probability of success, estimated at around 85%, with potential for increased confidence if I were more familiar with and regularly utilized the Micro8x0 series.
Have you considered using a tachometer or encoder connected to the motor to capture the actual speed, then correlating that with your 0-10V signal? This way, you can accurately determine the speed reference and calculate the remaining footage on the roll based on the maximum RPM and the formula you have. Additionally, if you're looking for a more integrated solution, some PLCs accept pulse input for speed measurement; you could leverage those capabilities alongside your current setup to achieve better tracking of the footage.
To track the remaining footage of your roll while converting the 0-10V analog signal into a usable speed reference, consider using a PID controller in your PLC program to manage the speed based on the analog input. You could map the voltage range to the corresponding RPM, scaling it down from the maximum 1450 RPM. Additionally, you can implement a counter that calculates the remaining footage based on the speed and the roll's circumference, updating continuously as the paper unwinds. This will give you a real-time estimate of the footage left while ensuring smooth operation of your V1000 drives. Don't forget to calibrate your sensor so that the system responds accurately!
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Answer: To convert the analog signal into a speed measurement, you can use a conversion formula based on the maximum speed of the motor at 230VAC.
Answer: By integrating the speed measurement over time, you can calculate the distance traveled by the paper roll and thus track the remaining footage.
Answer: You can consider using a speed sensor or encoder to accurately measure the speed of the motor and calculate the remaining footage based on the speed measurement and time elapsed.
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