Description
474-Add-on Modules
38
4.7.6 USB 2.0 Stand-alone Modules
Source side (CPU module)
Sink side (CON module)
Fig. 43
Interface side USB 2.0 stand-alone modules - Status LEDs
1 Failure LED link connection
2 Status LED link connection
3 Status LED USB 2.0
1 Failure LED link connection
2 Status LED link connection
3 Status LED USB 2.0
The following tables show the respective Link LED states/colors (left LED 1, 3 and right LED 2, 4) of the CPU Unit
and the CON Unit for the respective situation.
Status LEDs for Link Connection Cat X
Pos. 1
Pos. 2
Description
Off
Green
Link connection available.
Off
Flashing
green
No link connection available.
Flashing
green
Green
Link connection failure (flashes for approx. 20 s following each occurring
connection failure).
Status LEDs for Link Connection Fiber
Pos. 1
Pos. 2
Description
Off
Green
Link connection available.
Off
Flashing red No link connection available.
Flashing red
Green
Link connection failure (flashes for approx. 20 s following each occurring
connection failure).
USB 2.0 Status LEDs
Pos. 3
Description
Red
No link connection available, no USB-2.0 signal available.
Green
CPU Unit:
Link connection available, no USB-2.0 signal available.
Light blue
Link connection and USB 2.0 signal available (operating condition).
3
1 2
3
1 2
1 2
3
1 2
3