Automation and Drives - SCE
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:
Position | Description | Comments |
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 |
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| reset of the CPU. A CPU memory reset requires a specific |
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| operating sequence (refer to the Installation Manual, |
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| Chapter Commissioning) |
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Foreword | Notes | Hardware configuration | STEP 7 program | Testing |
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T I A Training Document |
| Page 8 of 25 |
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| A5 | |
Issue date: 02/2008 |
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| Programming the CPU | ||
