IAI America ROBO Cylinder Series - Manual (Page 315)

7. T
roubleshooting
307
Modbus
Continued from the previous page
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Did the problem occur after moving facilities?
Occurred after moving facilities o (1) Disconnection of communication cables o Fix disconnection
(2) Loosening of connectors for communication cables
o Check connection
(3) Wrong control communication speed setting
o Refer to "3.2. (1) Precautions o Check *6
Did the problem occur after adding controllers?
Occurred after adding controllers o (1) Wrong axis number settings for additional controllers o Check *4
(2) Wrong communication speed setting for additional controllers
o Check *6
(3) Wrong transmitter activation time setting for additional controllers
o Check parameter No. 17
(4) Wrong terminating resistor mounting position
o Mount the terminating resistor on the junction furthest
from the master (host). (Refer to Section 3.)
Was a new device started up (including newly introduced devices with existing settings)?
Cannot communicate with any controllers?
Check connection using the PC software for RC. *1
Cannot communicate with any controllers o (1) Wrong wiring of communication cables between
the host 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.
(3) Overlapping setting of controller axis numbers
o Check *4
(4) Inconsistent controller communication speed
setting o Check *6
Cannot communicate with specific controllers.o (1) Wrong wiring of communication cables
between controllers and junction
o Check wiring *3
(2) Device power supply error
o Check power supply voltage
(3) Overlapping setting of controller axis numbers
o Check *4
(4) Inconsistent controller communication speed
setting o Check *6
Can communicate. o [1] Inadequate host
programs
(1) Check programs again *5
(2) Check communication speed setting again *2