FP2−CCU | Troubleshooting |
5.2 What to Do if an Error Occurs
5.2What to Do if an Error Occurs
5.2.1If the ALARM LED on the Computer Communication Unit Lights
Situation
The watchdog timer is activated to alert the user of a problem with the Computer Communication Unit.
Solution
Turn the power supply off and then on again.
If the LED lights again, there may be a problem with the unit.
If the LED goes out after the power supply is turned off and then on again, the problem may have been caused by noise or another temporary phenomenon. Continue operation and watch for further signs of trouble.
5.2.2If the ERROR LED on the Computer Communication Unit Lights
Situation
If the communication conditions between the two devices do not match, or the received command is in the wrong format, communication cannot be carried out properly.
Solution 1
Check to see if the transmission speed (baud rate) and character bit have been set correctly. The conditions on the unit side can be set using the DIP switches on the back of the unit.
Solution 2
Check the transmission format for the host side, such as the computer or display panel. The format on the unit side is fixed.
Parity . . . . . . . Odd
Stop bit . . . . . 1−bit
Solution 3
In some cases, the ERROR LED may light if there is a problem with the format of the command sent from the host side. Check the settings on the host side, based on the error response returned to that side.
For information on error codes, please check page 6 − 5.
Tip
If correct data is received after erroneous data has been received, the ERROR LED goes out.
5 − 5