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
12-28 A5E00105492-03
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The figure below shows DC-operated coils equipped with diode or Zener diode
circuit.
with diode
with Zener diode
+
-
+
-
Figure 12-9 Circuit for coils operated with DC voltage
Diode/Zener diode circuits have the following characteristics:
• Opening surge voltage can be totally avoided.
The Zener diode has a higher switch-off voltage capacity.
• High switch-off delay (6 to 9 times higher than without protective circuit).
The Zener diode switches off faster than a diode circuit.
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The figure shows coils operated with AC voltage and varistor or RC circuit.
with varistor
with RC element
~
~
~
~
Figure 12-10 Circuit for coils operated with AC voltage
The characteristics of varistor circuits are:
• The amplitude of the opening surge is limited rather than attenuated.
• The surge rise-ratio remains the same
• Short off-delay.
The characteristics of RC circuits are:
• Amplitude and steepness of the opening surge are reduced.
• Short off-delay.

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