Table 2-4 Mode Selector Switch Settings - Siemens CPU 31 Series Technical Data Manual

Operating and display elements
2.2 Operating and display elements: CPU 31x
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
Position
RUN
STOP
MRES
Reference
• CPU operating modes:
• Information on CPU memory reset:
• Evaluation of the LEDs upon error or diagnostic event:
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.
2-8
Mode selector switch settings
Meaning
RUN mode
STOP mode
CPU memory reset
Commissioning, Commissioning Modules, CPU Memory Reset by means of Mode
Selector Switch
and
CPU 31x, Test Functions, Diagnostics and Troubleshooting, Diagnostics with the help of
Status and Error LEDs
Description
The CPU executes the user program.
The CPU does not execute a user program.
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.
STEP 7 Online Help.
Operating instructions CPU 31xC and CPU31x,
Operating Instructions CPU 31xC
CPU 31xC and CPU 31x, Technical Data
Manual, 01/2006 Edition, A5E00105475-06