Siemens SIMATIC ET 200SP Manual page 44

Meaning of the LED displays
The following tables explain the meaning of the status and error displays. Remedial measures
for diagnostic alarms can be found in the section Diagnostic alarms (Page 44).
Table 5- 1 Status and error displays DIAG
DIAG LED
Backplane bus supply of the ET 200SP not OK
Off
Technology module not configured
Flashes
Technology module configured but no module
diagnostics
On
Technology module configured and module diag-
nostics (at least one error pending)
Flashes
Table 5- 2
PWR LED
Channel LEDs
The CHn.RS, CHn.MI and CHn.DR LEDs indicate the current level of the associated signals. The
LEDs of the digital outputs CHn.P/A, CHn.D/B and CHn.ED indicate the desired state. If "Enable
diagnostic interrupts" is activated, the associated LED is switched off in the event of an error
at a digital output.
The flashing frequency of the channel LEDs is limited to approximately 24 Hz. If higher
frequencies are present, the channel LEDs do not indicate the current status but instead flash
at 24 Hz.
Table 5- 3
Technology module TM PTO 2x24V (6ES7138‑6EB00‑0BA0)
Equipment Manual, 09/2021, A5E50983437-AA
Meaning
PWR status indicators
Supply voltage missing
Off
Supply voltage is present and OK
On
CHn.m status displays
LEDs CHn.m
Pulse output/digital input/digital output at 0 level
Off
Pulse output/digital input/digital output at 1 level
On
Check or switch on the supply voltage on the CPU or
on the interface module.
—
Evaluate the diagnostic alarms and eliminate the
error.
Meaning
Interrupts/diagnostic alarms
5.1 Status and error displays
To correct or avoid errors
To correct or avoid errors
• Check the supply voltage.
• Check the BaseUnit type and the wiring
of the BaseUnit.
—
Meaning
43