Siemens S7-400 installation manual Special Cases

Wiring the S7-400

Figure 4-8 shows the methods described here. If the permissible potential difference between grounding points is exceeded, you must install an equipotential bonding conductor (copper conductor with a cross-section of ≥ 16 mm2).

CR		ER
Send IM	Shield/	Receive IM
	protective
	ground bar
	< 7 V

Figure 4-8 Shielding and Grounding the Connecting Cable for a Remote Connection

Special Cases

For remote connections, you must use precut/preassembled connecting cables of fixed length. When the connecting cables are laid, therefore, there may be excess lengths. These must be coiled with a bifilar winding and deposited.

4-16	Automation System S7-400	Hardware and Installation
		A5E00850741-01