474-Add-on Modules
Troubleshooting
51
9.5 Add-on Module, USB HID
Source side (CPU module)
Sink side (CON module)
Fig. 50
Interface side add-on module USB HID - Failure indication
Diagnosis
Possible reason
Measure
All LEDs are off.
Power supply voltage not available.
Check the power supply units.
Check the connection to the power
network.
The
Caps Lock
and
Scroll Lock
LEDs on
the keyboard are
flashing.
The keyboard is in command mode
Press Esc to leave the command mode.
Or press Left Shift + Esc to leave the
command mode.
Diagnosis
Possible reason
Measure
USB device without
function
CON Unit and
CPU Unit:
LED
1/2
are off.
No USB HID device detected.
Check the connection of the USB HID
cable to the USB HID device.
Connect a USB HID device.
Contact your distributor if necessary.
The USB HID device is not supported.
Check the compatibility.
New connection of the USB HID device.
Contact your distributor if necessary.
No USB HID connection to the source
available.
Check the connection of the USB cable
to the source, select another USB HID
port if necessary.
Remove the USB and power cables, first
connect the power cable, then connect
the USB cable, and restart the CPU Unit.
Problems with the USB HID connection at
the CON Unit.
Check the connection of the USB HID
cable to the USB HID device.
Remove the USB HID and power cables,
connect the power cable, then connect
the USB cable, and restart the CON Unit.
CON Unit:
LED
3
is flashing
slowly.
No connection between CON Unit and
CPU Unit
Check the interconnect cable.
Check the connectors.
3
2
1
3
2
1