Siemens SIMATIC S7-300 CPU Data: CPU 315-T-2 DP User Manual

Memory concept
6.2 Memory functions
6.2.3 CPU memory reset and restart
CPU memory reset
After the insertion/removal of a Micro Memory Card, a CPU memory reset restores defined
conditions for CPU restart (warm start).
Technology CPU:
• The CPU's memory management is rebuilt.
• Blocks in load memory are retained.
• All runtime-related blocks are transferred from the load memory to the working memory
again.
• The data blocks in the working memory are initialized (are thus reset to their initial
values).
Integrated technology of Technology CPU:
The CPU waits until the integrated technology has reached the STOP state.
• The integrated technology is parameterized again.
• The retentive memory of the integrated technology is rebuilt.
• Any distributed I/Os connected to DP(DRIVE) are parameterized again.
• The integrated technology is initialized again.
A description of the CPU memory reset procedure and its special features can be found in
chapter
CPU Memory Reset of the S7-300 installation manual.
Warm Restart
What happens during a warm restart:
• All retentive DBs retain their current values.
• Non-retentive DBs are reset to their initial values.
• The values of all retentive M, C, T are retained.
• All non-retentive user data are initialized:
– M, C, T, I, O with "0"
• All run levels are initialized.
• The process images are deleted.
S7-300 CPU Data: CPU 315T-2 DP
Manual, 12/2005, A5E00427933-02
6-13

Siemens SIMATIC S7-300 CPU Data: CPU 315-T-2 DP Specifications

General

Programming Language	STEP 7
Power Supply	24 V DC
Number of DP masters	1
Processable Technology objects	Yes
Number of counters	256
Number of timers	256
S7 communication	Yes
Number of connections for S7 communication, max.	16
PG/OP communication	Yes
Global data communication	Yes
Integrated DP interface	Yes
Integrated PROFINET interface	No
SIMATIC Computing Platform	No
Operating Temperature	0 to 60 °C
Integrated Interfaces	MPI, DP
Communication	PROFIBUS DP
Cycle Time	0.1 ms
Engineering with	STEP 7
Backup available	Yes
Transmission rate, max.	12 Mbit/s

Summary

Product Overview

Integrated technology of Technology CPU

Details the integration of technology and motion control functions within the SIMATIC CPU.

Setting up an S7-300 with a Technology CPU

Configuring

Covers configuration aspects like single-tier setup and subnets.

Addressing

Status and error displays of the Technology CPU

Explains the meaning of CPU LEDs for status and error indication.

Communication with the S7-300

MPI/DP interface (X1)

DP(DRIVE) interface (X3)

Communication services on the MPI/DP interface (X1)

Provides an overview of communication services like PG, OP, S7, and Global data communication.

Routing

Memory concept

Memory areas and retentive address areas

Memory functions

Covers functions for generating, modifying, or deleting programs and blocks.

CPU memory reset and restart

Cycle and response times

Cycle time

Explains the definition, calculation, and influencing factors of CPU cycle time.

Response time

Defines response time and analyzes factors affecting its variation and calculation.

Interrupt response time

Technical data

CPU 315T-2 DP

Lists detailed technical specifications for the CPU, including versions, technology objects, memory, and execution times.

Integrated Inputs/Outputs for Technology

Describes the arrangement and technical specifications of the CPU's integrated digital inputs and outputs.

Information for the Changeover to the Technology CPU

Changed behavior of certain SFCs