Installing the S7-400

2.6Chassis Terminal Connection in the Non-Isolated Configuration

Reference Point

The racks offer the option of connecting the 24-V load voltage ground in the non-isolated configuration to the 5-V ground (reference potential M, logic ground).

Connect the chassis ground to the reference point for non-isolated modules. The reference point is metallically connected to the reference potential M.

The following figure shows the position of the reference point on a rack.

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Metallic connection, disconnect upper screw for ungrounded assemblies

Load voltage ground connection (reference point)

Grounding terminal

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Automation System S7-400

Hardware and Installation

 

A5E00850741-01

Page 32
Image 32
Siemens S7-400 installation manual Reference Point