Siemens SIMATIC NET S7-300 User Manual

Header
Parameter
6 Programmed Communication Connections
A-177
S7-CPs for Industrial Ethernet Configuring and Commissioning
Release 01/2007
C79000-G8976-C182-07
6.6 Subfield types
Different parameters are required depending on the parameter field. Each
parameter is described by a subfield. Which subfields are required is explained in
the descriptions of the system data and the connection types in the previous
sections.
Each subfield consists of the specific parameter section and the header (4 Byte).
Example
The following excerpt from a CONF_DB illustrates the structure of a subfield based
on the example of the SUBNET_MASK subfield type.
Address Name Type Initial Value Comment
+14.0 Sub_field_2 STRUCT // Subfield 2 type SUBNET_MASK
+0.0 Sub_field_ID INT 2 // Subfield ID
+2.0 Sub_field_len INT 8 // Total length of the subfield in bytes
+4.0 Parameter STRUCT Parameter range of SUBNET_MASK
+0.0 Value_1 BYTE B#16#FF
+1.0 Value_2 BYTE B#16#FF
+2.0 Value_3 BYTE B#16#FF
+3.0 Value_4 BYTE B#16#0
=4.0 END_ STRUCT
=8.0 END_ STRUCT
In total, the following subfield types are available:
Table 6-10
Subfield
ID
1)
Subfield type Subfield length
(in bytes)
Meaning of the Parameter
1 SUB_IP_V4 4 + 4 IP address according to IPv4
2 SUB_NETMASK 4 + 4 Subnet mask
3 SUB_DNS_NAME Length of DNS
name + 4
DNS name
4 SUB_DNS_SERV_ADDR 4 + 4 DNS server address
8 SUB_DEF_ROUTER 4 + 4 IP address of default router
9 SUB_LOC_PORT 2 + 4 Local port
10 SUB_REM_PORT 2 + 4 Remote port, also for E-mail
connections
11 SUB_LOC_TSAP TSAP length + 4 Local TSAP

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)