Components Of An S7-300: - Siemens S7-300 Installation Manual

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A programming device (PG) is used to program the S7-300 PLC. Use a PG cable
to connect the PG and the CPU.
Several S7-300 CPUs can communicate with one another and with other SIMATIC
S7 PLCs via the PROFIBUS cable. You can connect several S7-300s using a
PROFIBUS bus cable.
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There is a whole range of components available for creating and using an S7-300.
The table below shows the major modules and their functions.
Table 4-1

Components of an S7-300:

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Mounting rail
(rack)
Accessory:
Shielding contact element
Power supply (PS)
CPU
Accessory:
Front connectors (for CPUs with
integrated peripherals)
Signal modules (SM)
(Digital input modules, digital
output modules, digital I/O
modules, analog input modules,
analog output modules, analog
I/O modules)
Accessory:
Front connectors
4-2
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This is the rack for an S7-300
This converts the line voltage
(120/230 VAC) to 24 VDC
operating voltage and is used to
supply the S7-300 and 24 VDC
load circuits
This runs the user program,
provides a 5 V supply to the S7-
300 backplane bus and
communicates with other MPI
network nodes via the MPI
interface.
In addition, a CPU can also be a
DP master or a DP slave in a
PROFIBUS subnet.
They match different process
signal levels to the S7-300.
S7-300 Automation System, Installing and Commissioning: CPU 312IFM - 318-2 DP
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CPUs 312 IFM to 318-2 DP
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