Appendix A: Troubleshooting Communication Data Issues
Symptom or Error
Jog Panel
2. Did the LED's on the Jog Panel/Pendant flash on power up?
Communication In Fault
If the LED's did not flash immediately on power up, check the back of
the jog board and confirm that the data cable is correctly plugged into
the header labeled CPU10. If this cable is plugged in correctly and the
LED's did not flash on power up, it is likely that the Jog Panel/Pendant
will need to be returned for repair.
3. Does your MPU11 have the updated crystal installed?
MPU11 boards that shipped prior to ##### may need to have the
crystal replaced due to a manufacturing defect
in the crystal. If your
MPU11 is dated prior to ##### (see pic) return it for repair.
Symptom or Error
PLC Communication
1. Does the GPIO4D have power?
In Fault
Check the 3.3, 5v, 12V and -12V LED's, if not lit, check for 5V, 12V and
-12V input on H6. If voltage is present, but the corresponding LED or
the 3.3V LED is not lit, send the GPIO4D in for repair. If no voltage is
present, check AC supply (85-264VAC) to the GPIO4D power supply. If
AC supply voltage is present but any or all of the 5V, 12V or -12V
signals are missing, replace the GPIO4D power supply.
2. Are the fiber optic cables plugged in and connected correctly?
Confirm that the fiber optic cables are connected at both the MPU11 and
the GPIO4D. Confirm also that the fiber plugged into the fiber optic
receiver labeled “1” on the MPU11 is connected to the receiver labeled
“1” on the GPIO4D and that the fiber optic cable plugged into the fiber
optic receiver labeled “3” on the MPU11 is connected to the receiver
labeled “3” on the GPIO4D.
3. Are the fiber optics transmitting and receiving signals correctly?
Fiber optic cables being plugged into the blue fiber optic receivers on
both the MPU11 and GPIO4D should have a “bright” red light visible at
the end of the fiber if you unplug the fiber optic cable and look at the end
of it. While “bright” is a relative term, if there is any doubt about whether
the signal is “bright” or not, there is almost certainly a problem. Pull the
fiber optic cable out of the blue receiver on the GPIO4D and confirm
that the signal is bright and that the transmission media (the clear
portion) of the fiber optic cable is flush with the plug on the end of the
cable. While watching the signal, manipulate and flex the cable and
confirm that the signal doesn't dim or blink while the cable is moved.
Now, do the same thing at the receiver at the MPU11. If the signal dims
or blinks, it indicates that the fiber optic cable is cracked and the cable
will need to be replaced. If there is no signal at all, pull the fiber out of
the transmitter (gray receptacle) on the other end and look into the
transmitter, if there is a signal coming out of the transmitter, the the fiber
optic cable will need to be replaced, if there is no signal coming out of
the transmitter, the board with the transmitter will need to be replaced.
