Siemens programming the cpu 314c-2dp User Manual

 

 

 

 

 

 

 

   

 

 

 

 

T I A  Training Document

 

Page 8 of 25 

  Module 

 

Status and fault/error displays 
The CPU has the following LED displays: 

 

Slot for the SIMATIC Micro Memory Card (MMC) 
 A SIMATIC Micro Memory Card (MMC) is used as a memory module for the CPU 31xC. The MMC 

can be used as a load memory and as a transportable data carrier. The MMC must be plugged in 
before the CPU can be operated because the CPUs 31xC do not have an integrated load memory. 

Mode selector 
The mode selector can be used to choose the current operating mode of the CPU. The mode 
selector is designed as a toggle switch with 3 positions.  

Positions of the mode selector 
The positions of the mode selector are explained in the same sequence as they occur on the CPU: 
   

RUN 

RUN mode 

The CPU is processing the user program 

STOP 

STOP mode 

The CPU is not processing a user program 

MRES 

Memory Reset 

Button position of the operating mode switch for a memory 
reset of the CPU.  A CPU memory reset requires a specific 
operating sequence (refer to the Installation Manual, 
Chapter Commissioning) 

Foreword                     Notes                      

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n                      STEP 7 program  

 

Testing 

A5 

Issue date: 02/2008                                                                                                                          Programming the CPU 314C-2DP