I have a set of 300 DP communication control CU310 DP servo drives, but when returning to the proximity switch, sometimes it can't stop positioning in time. It moves backward a little bit. The proximity switch is working fine, so I'm not sure what's causing this issue. Could you help me identify possible causes and factors that might be affecting this behavior?
A: Servo positioning control can be implemented either in the PLC or directly in the servo controller. If it's done through the PLC, you can use a 317-2PN/DP CPU with built-in positioning capabilities. In this setup, the PLC sends a speed command to the servo drive via communication and uses the feedback from the servo to perform position loop control within the PLC. This method requires a fast CPU and high-speed communication, which may not always be ideal.
Alternatively, positioning control can be handled by the servo controller itself. Many modern controllers, such as Siemens' older 611U and newer S120 models, come with integrated position control functions. In this case, the PLC writes the target position, speed, and other parameters into the corresponding registers of the servo controller. Then, the PLC sends a control word to trigger a motion block in the servo controller. Once triggered, the servo controller handles the entire positioning process based on the stored data, without needing continuous input from the PLC. After completing the movement, the servo drive sends a completion signal back to the PLC.
This approach reduces the load on the PLC and doesn't require high-speed communication. You can use a standard PLC with a DP port for this setup. It’s more efficient and often easier to implement, especially for applications where precise positioning is required without constant PLC intervention.
High Voltage Battery,10kw off grid solar system kit,10kw solar pv system,10kw off grid system,back up generator for house,complete solar system,home solar system cost
EMoreShare International Trade (Suzhou) Co., Ltd , https://www.emoreshare.com