Yaskawa MP940 Hardware Manual - Manual (Page 28)

MotionSuite™ MP940 Machine Controller Hardware Manual Section 5: Communications
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„ RS422/485 Interface Cable
1. Make sure that the drive system, control system, power system, and other
transmission systems are separate from each other (i.e., do not run the
power wire with the control wire).
2. The RS422/485 cable length is 300m maximum. Use the minimum length
necessary.
3. The MP940 module RS422/485 interface is a non-isolated system. Errors
may occur from noise in the connected terminal. If noise occurs, use a
shield-type cable and modem to reduce the noise.
4. In the case of RS422, insert a terminating resistor as needed. Make the
termination on the receiving side.
5. In the case of RS-485, attach a terminating resistor to both ends of the
transmission line.