Siemens CPU 315-2 DP Hardware And Installation Guide

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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
12-4 A5E00105492-03
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Depending on the emitting media (line or isolated) and the distance between the
interference source and the device, four different coupling mechanisms can
influence the PLC.
Table 12-5 Coupling mechanisms
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Electrical
coupling
Galvanic or mechanical
coupling always occurs when
two circuits use one common
cable.
• Clocked devices (influence on the
network due to converters and
third-party power supply modules)
• Starting motors
• Potential differences on component
enclosures with common power
supply
• Static discharge
Capacitive
coupling
Capacitive or electrical
coupling occurs between
conductors connected to
different potentials.
The coupling effect is
proportional to voltage
change over time.
• Interference coupling due to
parallel routing of signal cables
• Static discharge of the operator
• Contactors
Inductive
coupling
Inductive or magnetic
coupling occurs between two
current circuit loops. Current
flow in magnetic fields
induces interference voltages.
The coupling effect is
proportional to current change
over time.
• Transformers, motors, arc welding
devices
• Power supply cables routed in
parallelism
• Switched cable current
• High-frequency signal cable
• Coils without suppression circuit
Radio frequency
coupling
Radio frequency coupling
occurs when an
electromagnetic wave
reaches a conductor system.
This wave coupling induces
currents and voltages.
• Neighboring transmitters (e.g. radio
phones)
• Sparking (sparkplugs, collectors of
electrical motors, welding devices)
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Siemens CPU 315-2 DP Specifications

General

Memory	64 KB
Power Supply	24 V DC
Order Number	6ES7 315-2AG10-0AB0
Number of DP Masters	1
Number of DP Slaves	124
Load Memory	64 KB
Number of Timers	256
Number of Counters	256
Data Memory	64 KB
Operating Temperature	0 to 60 °C
Integrated Interfaces	MPI, DP
Digital Outputs	Not integrated
Analog Inputs	Not integrated
Analog Outputs	Not integrated
Programming Languages	LAD, FBD, STL
Digital Inputs	Not integrated
Weight	660 g