5
Construction and Functionality
EDBC250SIO | 2.0
41
5.4.4
LEDs "Channel"
The "Channel" LEDs are allocated to the module's terminals. Every group of 2 LEDs indicates
the state of the associated functional unit of output and/or input.
Safe digital inputs SI 0 .. SI 3 in conjunction with test pulse outputs
LEDs "Channel"; Safe digital inputs SI 0 .. SI 3
LED
position
Channel
Function
LED
Explanation
0
Input SI 0
SI0 state
Off
No valid input signal on channel 0, logical "0"
Green
24 VDC supplied to channel 0, logical "1"
1
SI0 diagnosis
Off
Normal operation
Red
External power supply or cross-fault
2
Input SI 1
SI1 state
Off
No valid input signal on channel 1, logical "0"
Green
24 VDC supplied to channel 1, logical "1"
3
SI1 diagnosis
Off
Normal operation
Red
External power supply or cross-fault
4
Input SI 2
SI2 state
Off
No valid input signal on channel 2, logical "0"
Green
24 VDC supplied to channel 2, logical "1"
5
SI2 diagnosis
Off
Normal operation
Red
External power supply or cross-fault
6
Input SI 3
SI3 state
Off
No valid input signal on channel 3, logical "0"
Green
24 VDC supplied to channel 3, logical "1"
7
SI3 diagnosis
Off
Normal operation
Red
External power supply or cross-fault
Information
The red "diagnosis" LEDs are disabled if the safe digital inputs are used
without the safe digital test pulse outputs.
The green "status" LEDs of the inputs will indicate the presence of a 24 VDC
signal at an input even if that input has not been set up in the configuration.
I