Operating and display elements
2.2 Operating and display elements: CPU 31x
CPU 31xC and CPU 31x, Technical Data
2-8 Manual, 01/2006 Edition, A5E00105475-06
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 a SIMATIC Micro
Memory Card for operation.
Mode selector switch
Use the mode selector switch to set the CPU operating mode.
Table 2-4 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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