Overview; Configuration Data Block - Siemens SIMATIC NET S7-300 Manual

6.1

Overview

Area of Application
Communication connections can be freely configured controlled by the program.
Interplay between Programming and Configuration
Connections are either configured using STEP 7 or configured by the user program
while the S7 station is running. Mixing these variants on a CP is not possible!
Principle
Configuration data for communication connections can be transferred to the CPU
using the function block called in the user program.
FB55 CP_CONFIG
The configuration DB can be loaded on the CP at any time. The previously
applicable connections and configuration data (IP address, subnet mask, default
router, NTP time server and other parameters) are overwritten.
The configuration DB can be loaded on the CP at any time. The previously valid
connections are then overwritten.
Based on the configuration data, the Ethernet CP recognizes that the
communication connections must be set up by the user program.
Notice
As soon as the user program transfers the connection data via FB55 IP_CONFIG,
the CPU switches the CP briefly to STOP. The CP accepts the system data (in-
cluding IP address) and the new connection data and processes it during startup
(RUN).
S7-CPs for Industrial Ethernet Configuring and Commissioning
Release 01/2007
C79000-G8976-C182-07
6 Programmed Communication Connections

Configuration data block

System data for CP
Connection 1
Connection 2
Connection n *)
Configuration data
transferred to the CP
*) n = 64
max
A -161