Siemens SIMATIC S7 Functional Safety Manual page 124

Fail-Safe signal module (SM) diagnostics
6.2 Fault diagnostics
SM 1226 F-DQ 2 x Relay
Table 6- 5
Module hardware fault
Inconsistent firmware
versions between Bus-
24 VDC module supply
24 VDC module supply
voltage too high / too
Module successfully
configured; no errors
Channel deactivated
Channel fault; passiv-
Awaiting reintegration
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
124
Module and output channel LEDs
Description
LED color
I/O bus power off
1
PROFIsafe error
ASIC and F-μCs
voltage off
low
Not configured
ated
Flashing red and green
progress
- On; - Flashing (Flashing frequency: 2.0 Hz)
DIAG LED
Green / red
Off
Flashing red
Flashing red
Flashing red
Flashing red
Flashing red
On green
Flashing green
On green
Flashing red
TBD
2
Flashing green
Output
Fault LED
Red
Off
On
Unaffected
Flashing
Off
On
Off Output state 0
Output state 1
Off
Off
On
3
Flashing
Off
S7-1200 Functional Safety Manual
Manual, 02/2015, A5E03470344-AA
Status LED
Green
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off