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IO Board Status LEDs
Each I
Fault indicator. The Normal LED may flash to show active communication.
Figure 2-22
In the illustration above, one I
shown to the left. These boards have a number of additional status LEDs, described in the
section on
IO Board DI Mode Switch
Switch SW1 located at the top of the board near the front (connector end) controls the mode
setting for the on-board digital inputs (DIs). The switch sets the mode for all DI circuits on the
board (mixing of modes on a board is not supported). The available options are Default/Sink
(Mode 2) and Legacy (Mode 1) A diagram is printed on the back of each board showing the
setting. The Legacy option is designed to adjust for a non-standard configuration that may be
in use on some systems. The Mode switch should be set to Mode 2 unless instructed differently
by Siemens.
Maxum II Reference Manual
Manual, 7/2017, 2000596-001
Electronic Compartment Component Descriptions and Maintenance Procedures
C-bus IO board has three status LEDs; a green Normal, a yellow Waning, and a red
2
CAN Bus
I/O Board LEDs
CAN Bus
I/O Boards
IO Board Status LEDs
CAN IO Board Information.
2
I
C
Bus
I/O Board
LEDs
I
2
C Bus
I/O Board
C IO board is shown on the right. Two legacy CAN boards are
2
2.4 Analog and Digital IO
57

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