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
5-20 A5E00105492-03
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If at all possible, set up the un
g
rounded reference potential before mountin
g
on the
rail.
If you have already installed and wired up the CPU, you may have to detach the
connection to the MPI interface before you pull out the grounding slide contact.
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When isolated modules are installed, the reference potentials of the control circuit
(M
internal
) and load circuit (M
external
) are electrically isolated.
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Use isolated modules for:
• All AC load circuits
• DC load circuits with separate reference potential
Examples:
– DC load circuits whose sensors have different reference potentials (for
example if grounded sensors are located at some considerable distance
from the control system and no equipotential bonding is possible)
– DC load circuits with grounded positive pole (L+) (battery circuits).
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You can use isolated modules, regardless of whether or not the control system's
reference potential is grounded.

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