Operating and display elements
2.1 Operating and display elements: CPU 31xC
CPU 31xC and CPU 31x, Technical Data
Manual, 01/2006 Edition, A5E00105475-06
2-3
Slot for the SIMATIC Micro Memory Card (MMC)
Memory module is a SIMATIC Micro Memory Card. You can use MMCs as load memory and
as portable storage medium.
Note
These CPUs do not have an integrated load memory and thus require an SIMATIC Micro
Memory Card for operation.
Mode selector switch
Use the mode selector switch to set the CPU operating mode.
Table 2-1 Mode selector switch settings
Position Meaning Description
RUN RUN mode The CPU executes the user program.
STOP STOP mode The CPU does not execute a user program.
MRES CPU memory
reset
Mode selector switch position with pushbutton function for CPU
memory reset. A CPU memory reset by means of mode selector
switch requires a specific sequence of operation.
Reference
• CPU operating modes:
STEP 7 Online Help.
• Information on CPU memory reset:
Operating instructions CPU 31xC and CPU31x,
Commissioning, Commissioning Modules, CPU Memory Reset by means of Mode
Selector Switch
• Evaluation of the LEDs upon error or diagnostic event:
Operating Instructions CPU 31xC
and CPU 31x, Test Functions, Diagnostics and Troubleshooting, Diagnostics with the
help of Status and Error LEDs
Power supply connection
Each CPU is equipped with a double-pole power supply socket. The connector with screw
terminals is inserted into this socket when the CPU is delivered.
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