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Inst Tools > Blog > PLC Tutorials > Siemens S7 300 CPU Status and LED Errors Explanation

Siemens S7 300 CPU Status and LED Errors Explanation

Last updated: March 4, 2021 12:14 pm
Editorial Staff
PLC Tutorials
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In Siemens S7 300 CPUs, there is a series of LED lights with different colors which shows us the modes, status, and errors of the PLC.

Contents
S7 300 LED ErrorsSFBFMAINTDC5VFRCERunSTOP

S7 300 LED Errors

Siemens S7 300 CPU Status and LED Errors Explanation

SF

System fault: it indicates there is an error in the system, this error could be software error like an error in programming or hardware error like a power loss of one of the input modules

Color: Steady Red

BF

Bus Fault: it indicates that there is an error in the system network, like a bad contact in one of the communication connectors, or there is an overlap between the addresses in the network

Color: Steady Red

MAINT

Maintenance: where ever this indicator energized this means that the CPU is not working anymore and needs a service, but this is rarely happening.

Color: Steady yellow

DC5V

This led indicates that there is a 24 Volt DC provided to the CPU.

Color: Steady Green

FRCE

Force: it indicates that at least one of the PLC inputs or outputs is forced to on or off.

Color: Steady yellow

Run

Run mode is on whenever the CPU is working properly without any troubles, and flashes in the startup of the CPU.

Color: Steady Green

STOP

a.

When the CPU is in STOP mode or there is a software/hardware error.

Color: Steady yellow

b.

For a memory reset request when inserting the memory card.

Color: Yellow flashes slowly

c.

When the memory reset is being carried out.

Color: Yellow flashes quickly

Author: Karim Ali Anwar

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4 Comments
  • John Quintero says:
    May 27, 2020 at 6:43 am

    Hello Karim, thank you very much for your explanation about the S7 300. Have a great day.

    Reply
  • Raghu Ram Gudela says:
    July 31, 2022 at 12:31 pm

    What if all the indications flashes at a time? Can anyone explain me about this?

    Reply
  • Nana Frimpong says:
    July 13, 2023 at 11:48 am

    APPRECITED WITH THE UPDATE ON S7-300-LED ERRORS.
    THANK YOU.

    Reply
  • MD.Raju says:
    August 21, 2023 at 9:30 am

    In CPU 315 2PN/DP
    if all indicator LED light same time glowing with out blinking what is the problem??
    Thank you

    Reply

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