Siemens SIMATIC ET 200eco PN M12-L Equipment Manual page 55

Modbus TCP
6.2 Diagnostics
Behavior of the LEDs RN/NS (RUN/network status), ER/MS (ERROR/module status) and MT/IO
(MAINT/IO status) on modbus TCP
The LEDs display the status with the highest priority if there are different LED states due to
overlaid events. (0 = off, 1 = green flashing, 2 = green, 3 = yellow, 4 = red flashing, 5 = red)
The following table shows the meaning of the RN/NS, ER/MS LEDs and MT/IO LEDs for Modbus
TCP:
Table 6- 3
Flashes
Flashes
Flashes
Flashes
Flashes
Flashes
Flashes
Flashes
54
Error display of the LEDs
LEDs
RN/ ER/ MT/
NS MS
Off Off Off
Off Off
On Off Off
Off
Flashes
On On Off
On Off
Flashes
Off
Flashes
Off
Flashes
Off
Flashes
Flashes Flashes
Flashes Flashes
Flashes Flashes
Meaning
IO
Missing or insufficient supply volt-
age at the I/O device.
I/O device on, no data exchange
The I/O device is exchanging data
with any connection.
MultiFieldbus project is present in
the I/O device, no data exchange
The I/O device exchanges data
without errors via a modbus TCP
connection
The I/O device exchanges data. An
error has occurred in the I/O device.
The I/O device does not exchange
data. An error has occurred in the
I/O device.
An existing connection to modbus
TCP was terminated by a timeout
An existing connection to Modbus
TCP was terminated by a timeout.
Errors in the configuration or pa-
rameter assignment.
Test of LEDs during startup: The
three LEDs light up simultaneously
for approximately 0.25 s in red.
Then for approximately 0.25 s in
green.
Hardware or firmware defective.
The "Node flash test" is running
(the P1 LK and P2 LK LEDs are also
flashing).
I/O device digital inputs DI 8x24VDC M12-L 8xM12 (6ES7141-6BG00-0BB0)
Remedy
• Check the supply volt-
age.
Check the following:
• Configuration
• Parameter settings
• PNIO diagnostics
Check the following:
• Configuration
• Parameter assignment
---
• You can read out the
service data with
MFCT.
Equipment Manual, 02/2022, A5E46570417-AC