Siemens SIMATIC NET S7-300 User Manual

6 Programmed Communication Connections
A-161
S7-CPs for Industrial Ethernet Configuring and Commissioning
Release 01/2007
C79000-G8976-C182-07
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
Configuration data block
Configuration data
transferred to the CP
Connection 1
Connection n *)
Connection 2
System data for CP
*) n
max
= 64
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).

Siemens SIMATIC NET S7-300 Specifications

General

Product Type Designation	SIMATIC NET S7-300
Mounting	DIN rail mounting
Protection Class	IP20
CPU Models	Various models available (e.g., CPU 312, CPU 314)
Communication Interfaces	MPI, PROFIBUS DP
Power Supply	24 V DC power supply required. Different power supply modules available.
I/O Modules	Digital input modules, digital output modules, analog input modules, analog output modules
Programming	STEP 7 software
Supply Voltage	24V DC or 120/230V AC (depending on model)
Digital Inputs	Available via digital input modules
Digital Outputs	Available via digital output modules
Analog Inputs	Available via analog input modules
Analog Outputs	Available via analog output modules
Communication Functions	MPI, PROFIBUS DP, Ethernet (depending on model)
Protocols	MPI, PROFIBUS DP, TCP/IP (depending on model)
Operating Temperature	0°C to 60°C
Storage Temperature	70 °C
Memory	Depends on CPU model (e.g., 32 KB to 1.5 MB)