Siemens Simatic S7-300 Specifications download pdf (Page 20)

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S7-300 Automation System CPU Specifications: CPU 31xC and CPU 31x

3-4 A5E00105475-03

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A SIMATIC micro memory card (MMC) is used as the memory module. The MMC

can be used as load memory and as portable storage medium.

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These CPUs do not have an integrated load memory, so an MMC MUST be

inserted in order to use the CPU.

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You can set the operating mode of the CPU with the mode selector switch. The

mode selector switch is a three-position toggle switch.

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The positions of the mode selector are explained in the order in which they appear

on the CPU.

Table 3-2 Positions of the mode selector switch

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RUN

mode

RUN mode The CPU executes the user program.

STOP STOP mode The CPU does not scan user programs.

MRES Memory reset Mode selector switch position with momentary pushbutton

function for CPU memory reset. Memory reset requires a

specific sequence of operation (refer to the Installation

Manual, Chapter &RPPLVVLRQLQJ).

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Each CPU is equipped with a 2-pin power supply socket. When the CPU is

supplied, the connector with screw terminals is already plugged into this socket.

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Further information on CPU operating modes is found in the 67(32QOLQH+HOS.

For information on how to reset CPU memory using the mode selector switch,

please refer to the Installation manual, Chapter &RPPLVVLRQLQJ.

Details on error / diagnostics evaluation per LEDs are found in your Installation

Guide, Chapter 7HVWLQJIXQFWLRQV'LDJQRVWLFVDQG)DXOW(OLPLQDWLRQ.

The 0HPRU\FRQFHSW chapter contains information on using the MMCs and about

the memory concept

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Siemens Simatic S7-300 Specifications Page 20