Epson RC90

4. Troubleshooting (PROFIBUS DP)
302 RC700 / RC90 Option Fieldbus I/O Rev.14
Physical Error
BF
ST
Master LED Condition
Light OFF
Red Light Blinking
Absent Slave LED Condition
(Physical error)
Red Light ON No Matter
♦ Process Flowchart
5
 No Problem
Check
Finish
Measure voltage of all
slave power supplies.
 No
Problem exists. (Fix it.)
No problem
Replace the unit.
Yes
No
Consult the PROFIBUS manufacturer.
Normal Communication?
♦ Causes of Error
Possible Cause
Examination Method
Countermeasure
 Electrical surges of
device power supply
Measure voltage of the device
power supply at the trouble
unit.
→It should be within the range
of sufficient voltage for
device operation.
Check voltage of the device
power supply.

Broken unit
Replace the trouble unit with a
new one.
→Verify whether the problem
is fixed.
Replace the unit with a new
one.