Siemens Simatic S7-300 Specifications download pdf (Page 3)

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

A5E00105475-03

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3.1 Operator control and display elements .............................................................3-1

3.1.1 CPU 31xC: Operator control and display elements ..........................................3-1

3.1.2 CPU 31x: Operator control and display elements.............................................3-5

3.2 SIMATIC Micro Memory Card (MMC) ...............................................................3-9

3.3 Interfaces.........................................................................................................3-11

3.4 DPV1 functions................................................................................................3-14

3.5 Real-time clock................................................................................................3-16

3.6 S7 Connections ...............................................................................................3-17

3.7 Communications..............................................................................................3-21

3.8 Routing ............................................................................................................3-25

3.9 Data consistency .............................................................................................3-28

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4.1 Memory areas....................................................................................................4-1

4.1.1 Distribution of the memory ................................................................................4-1

4.1.2 Retentive memory .............................................................................................4-2

4.2 Memory functions ..............................................................................................4-5

4.3 Address areas ...................................................................................................4-8

4.4 Handling of DB data ........................................................................................4-11

4.4.1 Recipes............................................................................................................4-11

4.4.2 Measurement value archives ..........................................................................4-13

4.5 Saving/retrieving complete projects to/from Micro Memory Card ...................4-15

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5.1 Overview............................................................................................................5-1

5.2 Cycle Time.........................................................................................................5-2

5.2.1 Overview............................................................................................................5-2

5.2.2 Calculating the cycle time..................................................................................5-4

5.2.3 Different cycle times ..........................................................................................5-7

5.2.4 Communication load..........................................................................................5-9

5.2.5 Cycle time extension as a result of testing and commissioning functions ......5-11

5.3 Response Time ...............................................................................................5-12

5.3.1 Overview..........................................................................................................5-12

5.3.2 Shortest response time ...................................................................................5-14

5.3.3 Longest response time ....................................................................................5-15

5.3.4 Reducing the response time with direct I/O access ........................................5-16

5.4 Calculating method for calculating the cycle/response time ...........................5-17

5.5 Interrupt response time ...................................................................................5-18

5.5.1 Overview..........................................................................................................5-18

5.5.2 Reproducibility of delay interrupts and watchdog interrupts ...........................5-20

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Siemens Simatic S7-300 Specifications Page 3

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