Omron E3X-DRT21 Operation Manual page 118

Errors and Troubleshooting
6-1-3 Errors in the E3X-CIF11
Indicator status
PWR indicator not lit. Power is not supplied to the Unit.
The current and voltage are outside
the permissible range.
The Unit is faulty.
U.ERR indicator lit The Unit is faulty.
red.
RXD indicator not lit. The data to be received through serial
communications has not arrived.
The Unit is faulty.
RXD indicator flash- A serial communications error has
ing yellow, TXD indi- occurred.
cator not lit.
The Unit is faulty.
SS indicator not lit. No Sensors are connected.
The Sensor adjacent to the Fiber
Amplifier Sensor Communication Unit
is faulty.
The power was turned ON while the
Mobile Console was connected.
The Unit is faulty.
Probable cause Remedy
Supply the power to the Unit through the power supply
cable.
Use the current and voltage within the permissible range.
Replace the Unit.
Replace the Unit.
Check the following items and then restart the Unit.
• Are communications commands being sent from the
master?
• Are cable lengths suitable?
• Are cables shorted, broken, or loose?
• Is the wiring configuration correct?
• Is terminating resistance connected to both ends of the
communications line only?
• Is there too much noise?
Replace the Unit.
Check the following items and then restart the Unit.
• Is the unit number set correctly on the rotary switch?
• Is the baud rate of the Unit the same as that of the mas-
ter?
• Are the communications settings of the Unit the same as
that of the master?
• Is the master sending the correct commands?
• Is the response delay time too short?
• Are cable lengths suitable?
• Are cables shorted, broken, or loose?
• Is the wiring configuration correct?
• Is terminating resistance connected to both ends of the
trunk line only?
• Is there too much noise?
Replace the Unit.
Connect the Sensors correctly.
Replace the Unit adjacent to the Communication Unit.
Temporarily disconnect the Mobile Console.
Replace the Unit.
Section 6-1
107