Profibus Interface - Siemens S7-1500 PROFIBUS Operating Instructions Manual

Meaning of the LED displays
The CM 1542-5 has 3 LEDs to display the current operating status and the diagnostics status
and these have the following meanings:
• RUN/STOP LED
• ERROR LED
• MAINT LED
The following table shows the meaning of the various combinations of colors of the
RUN/STOP, ERROR and MAINT LEDs.
Table 1- 4
RUN/STOP LED
LED lit green
LED lit green
LED lit green
LED flashing
LED lit green
LED lit green
LED lit green
LED flashing
1.6

PROFIBUS interface

9-pin D-sub female connector (PROFIBUS)
The PROFIBUS connector is located behind the cover of the housing. The interface is a 9-pin
D-sub female connector operating according to the RS-485 standard.
You also have the option of connecting to optical PROFIBUS networks via an Optical Bus
Terminal OBT or an Optical Link Module OLM.
You will find the pin assignment of the D-sub socket in section PROFIBUS interface terminal
assignment (Page 57).
SIMATIC CM 1542-5
Operating Instructions, 01/2023, C79000-G8976-C290-07
(one-color LED: green)
(one-color LED: red)
(one-color LED: yellow)
Meaning of the LEDs
ERROR LED
LED off LED off
LED lit red
LED lit red
LED off
LED off
green
LED flashing red
LED off
LED off
LED flashing red
green
MAINT LED
No supply voltage on the CM or supply
voltage too low.
LED off
LED test during startup
LED lit yellow
Startup (booting the CM)
LED off
CM is in RUN mode.
No disruptions
LED off
No CM configuration exists
Loading firmware
LED off
A diagnostics event has occurred.
LED off
Maintenance is demanded.
LED lit yellow
Maintenance is required.
LED flashing
yellow
Module fault
LED flashing
yellow
Application and functions
1.6 PROFIBUS interface
Meaning
19