Siemens Simatic S7-300 CPU 31xC Series User Manual

Commissioning
8.4 Commissioning the Modules
S7-300, CPU 31xC and CPU 31x: Installation
8-16 Operating Instructions, Edition 08/2004, A5E00105492-05
8.4.5.4 Using the PG for commissioning or maintenance
Requirements
The PG must be equipped with an integrated MPI interface or an MPI card in order to
connect it to an MPI.
Using the PG for commissioning or maintenance
1. Use a stub cable to connect the commissioning and maintenance PG to the other subnet
nodes. The bus connector of these nodes must be equipped with a PG socket.
The figure below shows the interconnection of two networked S7-300 and a PG.
SF
BUSF
DC5V
FRCE
RUN
ST OP
SIEM EN S
PS
SM
SF
BUSF
DC5V
FRCE
RUN
STOP
SIEMENS
CPU
PS
SM
PG
1
2
2
3
CPU
The figure illustrates the following
(1) Stub cable used to create connection between PG and CPU
(2) The enabled terminating resistor of the bus connector
(3) PROFIBUS bus cable used to network both CPUs

Siemens Simatic S7-300 CPU 31xC Series Specifications

General

Series	S7-300 CPU 31xC
Power Supply	24 V DC
Communication Interfaces	MPI, PROFIBUS DP
Programming Languages	LAD, STL, FBD, SCL
Operating Temperature	0°C to +60°C
Memory	48 KB - 512 KB
Dimensions	40 x 125 x 130 mm (varies by model)