Operating Mode Selector; Slot For Memory Cards; Leds Of The Cpus; Ram Cards - Siemens SIMATIC S7-400H Manual

Table 4-1
LED
INTF
EXTF
FRCE
RUN
STOP
BUS1F
BUS2F
MSTR
REDF
RACK0
RACK1
IFM1F
IFM2F

Operating Mode Selector

You can use the mode selector to select the current operating mode of the CPU.
The mode selector is a key switch with four switching positions. You can use
different protection levels and limit any program changes or startup options (STOP
to RUN transition) to a certain group of people.
Section 4.4 describes the functions of the mode selector and the protection levels
of the CPUs.

Slot for Memory Cards

You can insert a memory card in this slot.
There are two types of memory card:

• RAM cards

You can expand the load memory of a CPU with the RAM card.
• FLASH cards
You can use the FLASH card to store your user program and your data so that
they are failproof (even without a backup battery). You can either program the
FLASH card on the programming device or in the CPU. The FLASH card also
expands the load memory of the CPU.
A detailed description of memory cards is available in Chapter 4.5.1.
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07

LEDs of the CPUs

Color
red Internal fault
red External fault
yellow Active force request
green RUN mode
yellow STOP mode
red Bus fault at MPI/PROFIBUS DP interface 1
red Bus fault at PROFIBUS DP interface 2
yellow CPU leads the process
red Loss of redundancy/redundancy error
yellow CPU in rack 0
yellow CPU in rack 1
red Error at interface submodule 1
red Error at interface submodule 2
Installation of a CPU 41x-H
Meaning
4-3