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If the defect-mode restart fails, (for example, due to a hardware fault), the STOP and
ERROR LEDs are ON and the MAINT LED is OFF.
Operation in defect state cannot be guaranteed
Control devices can fail in an unsafe condition, resulting in unexpected operation of
controlled equipment. Such unexpected operations could result in death or serious injury to
personnel, and/or damage to equipment.
Use an emergency stop function, electromechanical overrides or other redundant
safeguards that are independent of the PLC.
Status LEDs on an SM
In addition, each digital SM provides a DIAG LED that indicates the status of the module:
● Green indicates that the module is operational
● Red indicates that the module is defective or non-operational
Each analog SM provides an I/O Channel LED for each of the analog inputs and outputs.
● Green indicates that the channel has been configured and is active
● Red indicates an error condition of the individual analog input or output
In addition, each analog SM provides a DIAG LED that indicates the status of the module:
● Green indicates that the module is operational
● Red indicates that the module is defective or non-operational
The SM detects the presence or absence of power to the module (field-side power, if
required).
Table 14- 2
Status LEDs for a signal module (SM)
Description
Field-side power is off
Not configured or update in progress
Module configured with no errors
Error condition
I/O error (with diagnostics enabled)
I/O error (with diagnostics disabled)
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG
WARNING
Online and diagnostic tools
DIAG
(Red / Green)
Flashing red
Flashing green
On (green)
Flashing red
-
-
14.1 Status LEDs
I/O Channel
(Red / Green)
Flashing red
Off
On (green)
-
Flashing red
On (green)
785
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