Siemens SIMATIC S7 - Page 124

Fail-Safe signal module (SM) diagnostics
6.2 Fault diagnostics
S7-1200 Functional Safety Manual
124 Manual, 02/2015, A5E03470344-AA
SM 1226 F-DQ 2 x Relay
Table 6- 5 Module and output channel LEDs
Description
DIAG LED
Output
Fault LED
Status LED
LED color
Green / red
Red
Green
I/O bus power off
Off
Off
Off
Module hardware fault
1
Flashing red
On
Off
PROFIsafe error
Flashing red
Unaffected
Off
Inconsistent firmware
versions between Bus-
ASIC and F-μCs
Flashing red Flashing
Off
24 VDC module supply
voltage off
Flashing red
Off
Off
24 VDC module supply
voltage too high / too
low
Flashing red On
Off
Module successfully
configured; no errors
On green
Off
Output state 0
Output state 1
Not configured
Flashing green
Off
Off
Channel deactivated
On green
Off
Off
Channel fault; passiv-
ated
Flashing red On
Off
Awaiting reintegration TBD
2
Flashing red and green
3
Flashing
Firmware update in
progress
Flashing green
Off
Off
- Off; - On; - Flashing (Flashing frequency: 2.0 Hz)
1
All channels passivated indicates a module-wide fault occurred. This could be an external condi-
tion such as supply voltage low or a detected internal module defect.
2
A single, dual color (green / red) flashing LED
3
Alternating flashing of the separate fault (red) and status (green) LEDs