Internet PLC Forum

Hi. After trying out MD888 for so long, I would say it's a good product. However, there's something I do not understand. If the stepper motor driver is controlled by pulse and direction signals, what determines the speed of the rotation? The pulse frequency?

Thank you.

Regards

Hi. This is what I observe and do not understand. Thanks a lot. You have been most helpful.

Hi. Recently played around with ExcelLink version 2 and found that it's a great program. However, I'm wondering how to write to the output of the PLC from Excel sheet since it's one of the option in Excel Link. Tried reading and writing to DM and it works but failed for writing to output and counter. Any ideas? Thank you.

Hi. I have another question. If the servo motor driver output is giving positional signal by A, B, and Z phase, is there anyway a 888 will be able to determine the position by reading the signal?

Regards

Ok. Thanks for the quick reply. Will try that out.

Dear all,

I'm trying to attach a LVDT that output 0-5vdc signal to the ADC port of a 888. The LVDT is going to measure distance of 80mm within 0.4s. Can 888 give an accurate reading? Or will the readings be delayed and end up LVDT going a distance of more than 80mm?

Regards
Can

Hi. Has anybody tried to control the speed of an ac servo motor by using the analogue output to give a voltage to the motor driver? I currently have a motor driver that accepts 0-10vdc as analogue input. I want to use the analogue output of 0-5vdc to control it. The question is that if I activate function setDAC 1,4096, will the motor driver immediately run at full speed? Or should I write a function to accelerateor decelerate the motor by varying the output voltage?

Regards
Can

Hi. Can I use an old laptop as a HMI for MD888+ instead? It will be connected to the plc by 9pin cable. Any ways to do it?

Regards
Ken