IAI America ROBO Cylinder Series - Manual (Page 316)

7. T
roubleshooting
308
Modbus
Continued from the previous page
Cannot communicate with specific controllers.
[1] Wrong wiring of communication cables between controllers and junction o Check wiring *3
[2] Device power supply error o Check power supply voltage o Check that the 0 V line is used
commonly for all devices o Use the 0 V line commonly for all devices.
Cannot communicate from time to time?
[1] Malfunction due to noise o (1) Decrease the communication speed Check *2
(2) Change communication cable wiring Check *7
(3) Check connection of FG of each RC controller *7
(4) Mount a clamp filter on the power lines
(5) Check grounding of the control board *7
[2] Inadequate host programs o Check programs again (occurrence of communication buffer overflow, etc.?)