Siemens SIMATIC S7 - Page 121

Fail-Safe signal module (SM) diagnostics
6.2 Fault diagnostics
S7-1200 Functional Safety Manual
Manual, 02/2015, A5E03470344-AA
121
SM 1226 F-DI 16 x 24 VDC
Table 6- 2 Module DIAG and 1oo1 input channel LEDs
Description
DIAG LED
Input
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
Unaffected
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
Sensor supply fault:
For inputs affected by
the fault
Flashing red On
Off
Sensor supply fault:
For inputs not affected
by the fault
Flashing red Unaffected
Input state 0
Input state 1
Module successfully
configured; no errors
On green
Off
Input state 0
Input state 1
Not configured
Flashing green
Off
Input state 0
Input state 1
Channel deactivated
On green
Off
Input state 0
Input state 1
Channel fault; passiv-
ated
Flashing red
On
Off
Awaiting reintegration,
module fault
2
Flashing red and green
3
Flashing
Awaiting reintegration,
channel fault
Flashing red
3
Flashing