Epson RC90 - Page 317

4. Troubleshooting (PROFIBUS DP)
RC700 / RC90 Option Fieldbus I/O Rev.14 305
4.2.2.3 Master: Uninitialized Network
Master Unit LED
Error Description
BF
ST
Light OFF
Light OFF
Uninitialized network
- Master unit power error
- Master unit configuration error
♦ Process Flowchart
7
 No Problem
Check
Measure voltage of all
slave power supplies.
Problem exists. (Fix it.)
No problem
Finish
 No
Replace the master unit.
Yes
No
Check for master device configuration.
Problem exists. (Fix it.)
No problem
 No Problem
Consult the PROFIBUS manufacturer.
Normal Communication?
♦ Causes of Error
Possible Cause
Examination Method
Countermeasure
 Electrical surges
of master device
power supply
Measure voltage of the device
power supply at the master unit.
→It should be within the range of
sufficient voltage for device
operation.
Check voltage of the
device power supply.

Master device
configuration error
Check that the master device was
configured properly.
→After changing the
configuration, verify whether
the problem is fixed.
Check the master unit
configuration.
 Broken master
unit
Replace the broken master unit
with a new one.
→Verify whether the problem is
fixed.
Replace the master unit
with a new one.