Siemens SIMATIC S7 Functional Safety Manual page 122

Fail-Safe signal module (SM) diagnostics
6.2 Fault diagnostics
Firmware update in
- Off;
All channels passivated indicates a module-wide fault occurred. This could be an external condi-
1
tion such as supply voltage low or a detected internal module defect.
A single, dual color (green / red) flashing LED
2
Alternating flashing of the separate fault (red) and status (green) LEDs
3
Table 6- 3
Description
LED color
Input state 0
(equivalent)
Input state 1
(equivalent)
Input state 0
equivalent)
Input state 1
equivalent)
Discrepancy
Discrepancy
error resolved;
reintegration
- Off;
A single, dual color (green / red) flashing LED
1
Alternating flashing of the separate fault (red) and status (green) LEDs
2
122
Description
LED color
progress
- On; - Flashing (Flashing frequency: 2.0 Hz)
Module DIAG and 1oo2 input channel LEDs
DIAG LED
Green / red
On green
(non-
(non-
error
Flashing red
TBD
Flashing red
awaiting
and green
- On; - Flashing (Flashing frequency: 2.0 Hz)
DIAG LED
Green / red
Flashing green
Primary input
Fault LED Status LED
Red
Off
On
1 2
Flashing
Input
Fault LED
Red
Off
Secondary input
Fault LED
Green Red
Off
Off
On
Off
On
Off On
Flashing
S7-1200 Functional Safety Manual
Manual, 02/2015, A5E03470344-AA
Status LED
Green
Off
Status LED
Green
Off
On
On
Off
Off
2