474-Add-on Modules
Troubleshooting
53
9.7 USB 2.0 Stand-alone Module
Source side (CPU module)
Sink side (CON module)
Fig. 52
Interface side USB 2.0 stand-alone modules - Failure indication
Diagnosis
Possible reason
Measure
USB 2.0 device without
function.
No USB 2.0 device connected.
Check the cable to the USB 2.0 device.
Connect a USB 2.0 device.
Contact your distributor if necessary.
The USB 2.0 device is not supported.
Check the installation of the USB 2.0
device and the necessary drivers at the
CPU.
New connection of the USB 2.0 device.
Contact your distributor if necessary.
No connection between CPU Unit and
source available.
Check the connection of the USB cable
to the source, select another USB port if
necessary.
Remove the USB and power cables, first
connect the power cable, then connect
the USB cable, and restart the CPU Unit.
LED
1
flashes.
Link connection failure between CON Unit
and CPU Unit.
Check the interconnect cable.
Check the connectors.
LED
2
flashes.
No connection between CON Unit and
CPU Unit available.
Check the interconnect cable.
Check the connectors.
CPU Unit:
LED
3
lights up green.
No connection between CPU Unit and
source available.
Check the connection of the USB cable
to the source, select another USB port if
necessary.
Remove the USB and power cables, first
connect the power cable, then connect
the USB cable, and restart the CPU Unit.
The source is off.
Switch-on the source.
CON Unit:
LED
3
lights up red.
No link connection between CON Unit and
CPU Unit available
Check the interconnect cable.
Check the connectors.
3
1 2
3
1 2
1 2
3
1 2
3