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

Memory concept
6.3 Recipes
6.3 6.3 Recipes
Introduction
A recipe represents a collection of user data.
You can implement a simple recipe concept using static DBs. In this case, the recipes should
have the same structure (length). One DB should exist per recipe.
Processing sequence
Recipe is written to load memory:
• The various data records of recipes are created as static DBs in STEP 7 and then
downloaded to the CPU. Therefore, recipes only use load memory, rather than RAM.
Working with recipe data:
• SFC83 "READ_DBL" is called in the user program to copy the data record of a current
recipe from the DB in load memory to a static DB that is located in work memory. As a
result, the RAM only has to accommodate the data of one record.
The user program can now access data of the current recipe.
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Figure 6-4 Handling recipes
Saving a modified recipe:
• The data of new or modified recipe data records generated during program execution can
be written to load memory. To do this, call SFC 84 "WRIT_DBL" in the user program.
The data written to load memory are portable and retentive on CPU memory reset.
You can backup modified records (recipes) by uploading and saving these in a single
block to the PG/PC.
S7-300 CPU Data: CPU 315T-2 DP
6-14 Manual, 12/2005, A5E00427933-02

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