Motor control

[can]

Hi. After playing around with the PLC and motors for a while with no problem, I encountered the same problem when I try to communicate with 4 MD888 using RS485. Trilogi can load using 9 pin to 485 while the motor is off but the same problem came back to haunt me when the motor is on. However, when I try to communicate with individual 888 using 9 pin cable, all works fine. Tried grounding the 9 pin port of the Auto 485 but the same problem still occurs. Any way to solve the problem?

[support]

If motor is affecting your communication, check that you have installed the noise absorbing components to the motor brushes (if it is DC motor).

Also biasing the RS485 line will help it to reduce effect of switching noise from affecting the communication.