Siemens SIMATIC NET S7-300 User Manual

2 Characteristics of the Ethernet CPs
A-53
S7-CPs for Industrial Ethernet Configuring and Commissioning
Release 01/2007
C79000-G8976-C182-07
2.4 Slot Rules for SIMATIC S7-300
2.4.1 Permissible Slots
In the SIMATIC S7-300, there is no set slot assignment for the SIMATIC NET CPs.
Slots 4 to 11 are permissible (1, 2 and 3 cannot be used for CPs).
The SIMATIC NET CPs can be installed both in the central rack and in an
expansion rack, linked to the central rack via an IM 360/IM 361 (K-bus connection).
2.4.2 Number of SIMATIC NET CPs
The number of SIMATIC NET CPs that can be operated is not limited by the
system (for example S7-300 CPU, slot rules etc.), but by the application
(maximum cycle time of the application). The following components must be added
into the calculation of the cycle time on top of the existing S7 user program:
 Execution time of the FCs:
For communication between the S7-300 CPU and SIMATIC NET CPs, blocks
(FCs/FBs) are necessary. How often these blocks are called depends on the
number of connections or the number of SIMATIC NET CPs. Depending on the
amount of data transmitted, every block call extends the time required by the
user program.
 Data conversion:
It may also be necessary for the information to be converted before
transmission or after reception.
Please refer to the information in the relevant device manual.
2.4.3 Multicomputing
This functionality is not supported by the SIMATIC S7-300.

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)