Siemens SIMATIC Equipment Manual

Interrupts/diagnostics alarms
5.1 Status and error displays
I/O device digital inputs DI 16x24VDC M12-L 8xM12 (6ES7141-6BH00-0BB0)
Equipment Manual, 06/2021, A5E46570510-AB
25
P1 LK and P2 LK LEDs
Table 5- 2 Error display of the P1 LK and P2 LK LEDs
LEDs
Meaning Solution
P1 LK
P2 LK
Off
There is no Ethernet connection between
the communications interface of your IO
device and a communication partner
(e.g. IO controller).
Check whether the bus cable to the
switch/communication partner is inter-
rupted.
On
There is an Ethernet connection between
the communications interface of your IO
device and a communication partner
(e.g. IO controller).
---
Flashing
The "Node flash test" is running (the
RN/NS, ER/MS and MT/IO LEDs also flash).
---
Communications error:
A physical connection exists, communi-
cation is not possible, however.
Check the PROFINET IO settings.
Channel status/channel error LED
Table 5- 3 Status and error display of the channel status/channel error LED
LEDs
Meaning
Channel sta-
tus/channel
error
Off
Process value = 0
On
Process value = 1
On
Channel diagnostics

Siemens SIMATIC Specifications

General

Product type designation	SIMATIC
CPU	Varies by model
Memory	Varies by model
Input/Output	Varies by model
Communication	Varies by model
Programming Language	STEP 7
Operating Temperature	0°C to 60°C (varies by model)
Protection Class	IP20
Category	Programmable Logic Controller (PLC)