Siemens S7-300 appendix Table of contents

Table of contents

4	Memory concept		4-1
	4.1	Memory areas and retentivity	4-1
	4.1.1	CPU memory areas	4-1
	4.1.2	Retentivity of the load memory, system memory and RAM	4-2
	4.1.3	Retentivity of memory objects	4-3
	4.1.4	Address areas of system memory	4-5
	4.1.5	Properties of the Micro Memory Card (MMC)	4-9
	4.2	Memory functions	4-11
	4.2.1	General: Memory functions	4-11
	4.2.2	Loading user program from Micro Memory Card (MMC) to the CPU	4-11
	4.2.3	Handling with modules	4-12
	4.2.3.1	Download of new blocks or delta downloads	4-12
	4.2.3.2	Uploading blocks	4-12
	4.2.3.3	Deleting blocks	4-13
	4.2.3.4	Compressing blocks	4-13
	4.2.3.5	Promming (RAM to ROM)	4-13
	4.2.4	CPU memory reset and restart	4-13
	4.2.5	Recipes	4-15
	4.2.6	Measured value log files	4-17
	4.2.7	Backup of project data to a Micro Memory Card (MMC)	4-19

5	Cycle and reaction times		5-1
	5.1	Overview	5-1
	5.2	Cycle time	5-2
	5.2.1	Overview	5-2
	5.2.2	Calculating the cycle time	5-5
	5.2.3	Different cycle times	5-8
	5.2.4	Communication load	5-9
	5.2.5	Cycle time extension as a result of testing and commissioning functions	5-11
	5.2.6	Cycle extension through component-based automation (CBA)	5-11
	5.3	Response time	5-14
	5.3.1	Overview	5-14
	5.3.2	Shortest response time	5-16
	5.3.3	Longest response time	5-17
	5.3.4	Reducing the response time with direct I/O access	5-18
	5.4	Calculating method for calculating the cycle/response time	5-19
	5.5	Interrupt response time	5-21
	5.5.1	Overview	5-21
	5.5.2	Reproducibility of delay interrupts and watchdog interrupts	5-23
	5.6	Sample calculations	5-24
	5.6.1	Example of cycle time calculation	5-24
	5.6.2	Sample of response time calculation	5-25
	5.6.3	Example of interrupt response time calculation	5-27
6	Technical data of CPU 31xC		6-1
	6.1	General technical data	6-1
	6.1.1	Dimensions of CPU 31xC	6-1
	6.1.2	Technical data of the Micro Memory Card (MMC)	6-2
	6.2	CPU 312C	6-3
	6.3	CPU 313C	6-8
	6.4	CPU 313C-2 PtP and CPU 313C-2 DP	6-14
viii		CPU 31xC and CPU 31x, Technical data
		Manual, Edition 08/2004, A5E00105475-05