Siemens S7-300 - 5.4 Sensor and Actuator Requirements for F-SMs in Safety Mode

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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
A5E00203919-01
5-21
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In larger plants, it might prove necessary to install the S7-300 with floating
reference potential because of short-circuit to ground monitoring. This is the case,
for example, in chemical industry and power stations.
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This connection diagram applies to the
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CPU 313 6ES7 313-1AD03-0AB0 01
CPU 314 6ES7 314-1AE04-0AB0
6ES7 314-1AE84-0AB0
01
CPU 314 IFM 6ES7 314-5AE03-0AB0 01
CPU 314 IFM 6ES7 314-5AE83-0AB0 01
CPU 315 6ES7 315-1AF03-0AB0 01
CPU 315-2 DP 6ES7 315-2AF03-0AB0
6ES7 315-2AF83-0AB0
01
CPU 316-2 DP 6ES7 316-2AG00-0AB0 01
CPU 318-2 DP 6ES7 318-2AJ00-0AB0 03
The diagram illustrates an S7-300 configuration with floating reference potential
(jumper has been removed)
M
L+
M
M
L+
M
1M
<100 nF
1
2
3
Figure 5-8 S7-300 configuration with floating reference potential (CPU 313 – 318-2 DP)
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1 The grounding bus cable
2 The reference potential of the CPU interconnection
3 The mounting rail