Siemens SIMATIC NET S7-300 User Manual

A-180
S7-CPs for Industrial Ethernet Configuring and Commissioning
Release 01/2007
C79000-G8976-C182-07
7 Programming FCs (Functions) and FBs for S7
Ethernet CPs
The interface to several communication services is implemented by ready-made
program blocks (FCs and FBs). This chapter includes a detailed description of
these blocks.
The description of each FC / FB includes the following sections and these may be
extended by further information specific to the FC / FB:
 Meaning
 Call Interface
 How the Block Works
 Explanation of the Formal Parameters
 Condition Codes
This chapter provides you with information over and above the general information
available in the online help for the FCs when programming in STEP 7.
You will find further information in the following sources:
 The communication FBs (BSEND, BRCV, PUT, GET, USEND, URCV,
C_CNTRL) for programming S7 communication are described in the STEP 7
Documentation /8/.
Sample configurations and programs are available for the SEND/RECEIVE
interface described here:
 In the sample project PROJECT_ETHERNET that you can start immediately
after installing NCM S7; for a description, refer to the Primer.
 On the Internet as downloadable sample projects; refer to the information in
Appendix C “Support and Training”.
The Quick Start CD that can be ordered separately is a
treasure-trove of sample programs and configurations.
You can order this directly on the Internet at:
http://www4.ad.siemens.de/WW/news/en/574211
Entry ID: 574211

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)