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SIMATIC S7Siemens AG 1999. All rights reserved.

Information and Training Center

Knowledge for Automation

Hardware Configuration and Memory Concept


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Memory Concept of the S7-300

Comments

Symbols

Blocks:

Logic blocks(OB,FC,FB)

Data blocks(DB)

Flash EPROMMemory Card in PG(subsequentlyinserted in CPU)

Blocks:

Logic blocks(OB,FC,FB) Data blocks(DB)

Additional info.

System memory:

PII, PIQ

M, T, C

Retentive

M, T, C

Retent. data blocks

Retentive memory:

With PowerOFF withoutbatterybackup

n. reten. reten.

with PowerON withoutbatterybackup

RAM

Blocks:

Logic blocks

(OB,FC,FB) Data blocks(DB)

Additional info.

Load memory:

Flash-EPROM

Work memory:

OB,FC,FB

DB

n. reten. reten.


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Memory Concept of the S7-400

Comments

Symbols

Blocks:

Logic blocks(OB,FC,FB)

Data blocks(DB)

Flash EPROMMemory Card in PG(subsequentlyinserted in CPU)

Blocks:

Logic blocks(OB,FC,FB) Data blocks(DB)

Additional info.

RAM

Blocks:

Logic blocks

(OB,FC,FB) Data blocks(DB)

Additional info

Load memory:

Flash-EPROM

System memory:

PII, PIQ

M, T, C

Work memory:

OB,FC,FB

DB

Backupviabattery


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Loading Blocks into /out of Flash EPROM Memory Card

Load memoryinternal RAM

"Load"

Load memoryFlash EPROM"Load in EPROM"

Work memoryRAM

After insertingthe memorycard:memory resetrequestand copying

in workmemorySections

relevant forexecution

"Load in PG"


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Hardware Configuration and Parameter Assignment

Actual configuration Actual configuration and parameter assignmentof an existing hardware.

Parameter-assignment Establishing the characteristics of parameter-

assignable blocks, e.g: startup characteristics,retentive areas, etc.)

Preset configuration Planned hardware configuration andparameter assignment.

Configuration Assignment of racks, blocks and distributedI/O in the Station window of HW Config.

You can select the components from ahardware catalog.


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Inserting a Station


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Starting HW Config


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Generating a Hardware Preset Configuration


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Module Address Overview

Address Overview


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CPU Properties

2x


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CPU Properties: General


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CPU Properties: Startup


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CPU Properties: Retentive

Only relevant if CPUhas no backupbattery


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CPU Properties: Cycle / Clock Memory

Clock memory bit 7 6 5 4 3 2 1 0

Frequency (Hz) 0.5 0.62 1 1.25 2 2.5 5 10

Period (s) 2 1.6 1 0.8 0.5 0.4 0.2 0.1


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CPU Properties: Protection


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CPU Properties: Diagnostics / Clock


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Saving the HW Preset Configuration and Downloading it in Module

Download(only when CPUis in STOP mode)


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Uploading the HW Actual Configuration to the PG


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Displaying Hardware Diagnostics in the SIMATIC Manager

2x


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Possible Problems with Configuration

Configuration cannot be compiledIn S7-300, gaps in configuration

Situation Result/Remedy

CPU goes in Stop mode because of aparameter assignment error

Analog module in incorrect slot

Analog module signals group errorbecause of incorrect parameterassignment

Incorrect measuring range foranalog module

Reload configurationAfter a memory reset, differentparameter assignment of modules

Create HW station or"Upload Station"

Not possible to open HW Config.

Open the station offlineModule parameters cannot be modified

Configuration cannot be downloadedIncorrect CPU (e.g. CPU 315-2DPinstead of CPU 314)


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Variable Addressing

2x


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Accessing the Symbol Table

Once with right


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Exercise: Reading Out and Adapting the Actual Configuration

Start the SIMATIC Manager

Step What to Do Result

1 The tool is started

2 Open the project "My Project" The project structure is displayed

3 Download the actual configuration withPLC -> Upload

A new HW station is created

4 Check whether the correct modules(order numbers) are entered ???

5 Enter the correct order numbers forthe modules

The parameter blocks of the CPUare displayed

6

Save the configuration as"My Station" and download theconfiguration

7 If you have an S7-400 training unit,adapt the addresses (see text)

The addresses are the same as theS7-300 training unit, version B


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Exercise: Assign Parameters to Clock Memory and Test It

In the CPU assign parameters to aclock memory MB 10

Step What to Do Result

1

3Check the function by programmingan OB 1 with the statementsL MB 10, T QB 9 (QB 5)

QB9 (QB5) on thesimulator should flash

Save and download the

configuration in the CPU2

MB 10 flashes

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