Assembly of a CPU 41x–H
5.1 Operator controls and display elements of the CPUs
S7-400H
48 System Manual, 03/2012, A5E00267695-11
LED displays
The following table shows an overview of the LED displays on the individual CPUs.
Sections Monitoring functions of the CPU (Page 52) and Status and error displays
(Page 55) describe the states and errors/faults indicated by these LEDs.
Table 5- 1 LED displays on the CPUs
LED Color Meaning
INTF red Internal error
EXTF red External error
BUS1F red Bus fault on MPI/PROFIBUS DP interface 1
IFM1F red Error in synchronization module 1
IFM2F red Error in synchronization module 2
FRCE yellow Active force request
MAINT yellow Maintenance request pending
RUN green RUN mode
STOP yellow STOP mode
REDF red Loss of redundancy/Redundancy fault
BUS2F red Bus error at the PROFIBUS interface
BUS5F red Bus error at the PROFINET interface
MSTR yellow CPU controls the process
RACK0 yellow CPU in rack 0
RACK1 yellow CPU in rack 1
LINK 1 OK green Connection via synchronization module 1 is active and OK
LINK 2 OK green Connection via synchronization module 2 is active and OK
LINK green Connection at the PROFINET interface is active
RX/TX orange Receiving or sending data at the PROFINET interface.
Mode switch
You can use the mode switch to set the current operating mode of the CPU. The mode
switch is a toggle switch with three switching positions.
Section Function of the mode switch (Page 60) describes the functions of the mode switch.
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