Siemens SIMATIC NET S7-300 User Manual

2 Characteristics of the Ethernet CPs
A-54
S7-CPs for Industrial Ethernet Configuring and Commissioning
Release 01/2007
C79000-G8976-C182-07
2.4.4 Removing / Inserting (Replacing Modules)
Note
Removing and inserting the SIMATIC NET CPs for the SIMATIC S7-300 while the
power is on is not permitted.
You should also remember that by removing a module from the rack, all modules
on the other side of it will be disconnected from the CPU.
A PG is required to download the configuration after replacing a module. If the CP
supports the option of saving the configuration data on the CPU, it is also possible
to replace a module without a PG (see CP-specific description).
2.4.5 Note on the S7-300 CPU: Connection Resources
Note that when using older S7-300 CPUs (≤ CPU 316), a maximum of four S7 type
connections for CP communication are supported. Of these four connections, one
is reserved for a PG and another for an OP (HMI = Human Machine Interface).
The newer CPUs (from 10/99 onwards) support twelve and the CPU 318-2DP
supports sixteen S7 connections.
As a result, the older S7-300 CPUs have only two “free” S7 connections available.
These two connections can be used for S7 communication, for PROFIBUS-FMS,
for longer data, or FETCH, WRITE and TCP connections with Industrial Ethernet.
Notice
Removing and inserting the SIMATIC NET CPs for the SIMATIC S7-300 while the
power is on not permitted.
You should also remember that by removing a module from the rack, all modules
on the other side of it will be disconnected from the CPU.

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)