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
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If you install an S7-300 with ungrounded reference potential, any interference
currents that occur are dissipated via an RC system to the ground conductor/local
ground integrated into the CPU.
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An S7-300 with a CPU 31xC cannot be configured ungrounded.
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In extended systems, the S7-300 may require configuration with grounded
reference potential due to ground-fault monitoring. This is the case, for example, in
chemical industry and power stations.
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The diagram illustrates an S7-300 configuration with floating reference potential
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Figure 5-8 Creating an ungrounded reference potential on a CPU
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 If you implement an ungrounded reference potential in your CPU: Use a
screwdriver with 3.5 mm blade width and push the grounding slide contact forwards
in the direction of the arrow until it snaps into place.
 Ground of internal CPU circuitry
 Rail

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