Yaskawa P7B Drive Bypass - Manual (Page 259)

Communications D - 1
Appendix D
Communication
This appendix details the specifications, connections, and programming of the Drive
for Modbus communications.
The H/O/A switch must be in the AUTO position if serial communication is to be
used for P7 Drive run, stop and speed control.
Using Modbus Communication ...................................................... 2
Modbus Communication Configuration ...................................... 2
Communication Specifications ................................................... 2
Communication Connection Terminal ........................................ 3
Procedure for Setting Up Communication ................................. 3
Modbus Function Code Details ...................................................... 7
Reading/Holding Register Contents (03H) ................................ 7
Write In Single Holding Register (06H) ...................................... 7
Loopback Test (08H) ................................................................. 8
Write In Several Holding Registers (10H) .................................. 8
Modbus Data Tables ....................................................................... 9
Reference Data .......................................................................... 9
Monitor Data ............................................................................ 10
Modbus Self-Diagnosis ................................................................ 14