Hello! I am currently working with an OMRON CJ1M PLC (CPU 13) paired with an analog module MAD42. As a newcomer to OMRON PLCs, I'm finding the manual a bit challenging to navigate. My primary objective is to transmit a current signal of 4 to 20 mA from Output 1 of the analog MAD42 card to a Variable Frequency Drive (VFD). Essentially, I'm using this 4-20 mA signal to regulate the VFD's frequency. Additionally, I need to send a 0 to 10 V signal from a sensor to Input 1 of the MAD42 analog card. Up to this point, I have successfully enabled all the analog channels and configured my output for 4-20 mA and my input for 0-10 V. Currently, I am facing a challenge in writing the ladder logic program for this setup, particularly with scaling the signals so that the PLC can accurately transmit and receive the correct values. I’ve reviewed the scaling section of the manual but I'm uncertain whether to set my 4 mA value to 0000 (hexadecimal), simply leave it at 0 in decimal, or set it to 4. Any guidance or advice would be immensely helpful. Thank you in advance for your assistance!
The value range for either 0-10V DC or 4-20 mA signals can extend from 0 to 4000 decimal or 0 to 8000 decimal, depending on your module's configuration. For instance, the initial input value (assuming it's module 0) will be displayed at the CIO address 2005. Meanwhile, the data that you enter into CIO address 2001 will be transmitted to the first output. This information is critical for configuring your modules effectively, ensuring reliable communication between your input and output systems.
I can observe the changes in the CIO 2005 value within the memory table when I adjust the analog input. However, what's the best way to convert this value to decimal format so it can be displayed on an HMI? I am not sure if direct reading from the CIO is possible.
Explore the SCL or SCL2 instruction for more insights and understanding.
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