Siemens S7 Series User Manual

2 Solution
Communication with S7 CPU via KNX Gateway
Entry ID: 109739689, V1.0, 06/2017
7
 Siemens AG 2017 All rights reserved
2.2 Description of the core functionality
Configuration
The connection between the S7-1200 CPU and the gateway is configured via
 the configuration of the gateway as distributed I/O in STEP 7 (TIA Portal).
 configuration files of the gateway (cfg and txt files) (see Figure 3-3) that
reference each other.
The configuration files are downloaded to the gateway using the integrated web
server or directly edited.
Configuring and programming the gateway requires no ETS software. The gateway
can access existing data points (group addresses) in the KNX network and provide
its own data points locally on the gateway.
The assignment of the devices’ group addresses and physical addresses is not
part of this description. For more information, please refer to the supplied ETS5
sample project. The gateway’s physical address (KNX) is set using the “eib1.cfg”
configuration file (see 4.4.3).
Function and data types
This application example contains a STEP 7 project and a data record for the
gateway, where data of different data types is exchanged between an S7-1200
CPU and KNX devices in both directions via the gateway. A decimal value is
transferred from the S7-1200 CPU to the KNX control room unit’s display and a
status LED of the KNX wall switch is controlled via a binary signal. Conversely, the
value of the integrated temperature sensor and a configurable decimal value are
transferred from the KNX room control unit. Using the KNX wall switch, a boolean
variable is set/reset in the S7-1200 CPU.
The following data types are used and parameterized:
Table 2-2: SIMATIC / gateway data types
SIMATIC (S7-1200
CPU)
Gateway
KNX
PROFINET
KNX
BOOL
↔
BIT
UINT1
↔
DPT-1
INT
↔
SINT16
SINT16
↔
DPT-7
REAL
←
FLOAT32
SFLOAT
←
DPT-9

Siemens S7 Series Specifications

General

CPU	Varies by model (e.g., S7-300, S7-400, S7-1200, S7-1500)
Memory	Varies by model (e.g., 64 KB to 20 MB)
Communication Interfaces	PROFINET, PROFIBUS, Ethernet, MPI
I/O Modules	Digital Input (DI), Digital Output (DO), Analog Input (AI), Analog Output (AO)
Programming	STEP 7 (TIA Portal) programming software. Supports various programming languages and provides tools for configuration, diagnostics, and commissioning.
Power Supply	24 V DC, 120/230 V AC. Integrated or external power supply, depending on the CPU and system configuration.
Operating Temperature	Typically 0 to 60 °C (horizontal mounting), -20 to 60°C (vertical mounting), depending on the specific module.
Product Type Designation	S7-300, S7-400, S7-1200, S7-1500
Programming Languages	LAD, FBD, STL, SCL, GRAPH
Digital Inputs	Varies by module (e.g., 8, 16, 32 channels)
Digital Outputs	Varies by module (e.g., 8, 16, 32 channels)
Analog Inputs	Varies by module (e.g., 2, 4, 8 channels)
Analog Outputs	Varies by module (e.g., 2, 4, 8 channels)
Operating Voltage	24V DC or 120/230V AC (varies by model)
CPU Processing Speed	Varies by model (e.g., 0.1 ms to 5 ns per instruction)
Real-time Clock	Integrated (varies by model)
Mounting Type	DIN rail mounting.
Protection Class	IP20