Installation Guidelines
S5-90U/S5-95U
3.4.3 Connecting Non-Floating and Floating Modules
The following sections show the special features involved in installations with nonfloating and floating
modules.
Installation with Non-Floating Modules
In installations with non-floating modules, the reference potential of the control circuit (M
internal
) and
the load circuits (M
external
) are not galvanically isolated.
The reference potential of the control circuit (M
internal
) is at the PE terminal or
and must be
connected to the reference potential of the load circuit via a line to be run externally.
Figure 3-29 shows a simplified representation of an installation with nonfloating modules. The
installation is independent of the grounding concept. The connections for the grounding measures
are therefore
not shown:
Figure 3-29. Simplified Representation of an Installation with Non-Floating Modules
a a a a a a a
a a a a a a a
a a a a a a a
a a a a a a a
a a a a a a a
1L+
a a a a a
a a a a a
a a a a a
a a a a a
a a a a a
1L
-
a a a a a a
a a a a a a
a a a a a a
a a a a a a
a a a a a a
CPU
a a a a
a a a a
a a a a
a a a a
a a a a
DI
a a a a a
a a a a a
a a a a a
a a a a a
a a a a a
DO
a a a a a
a a a a a
a a a a a
a a a a a
a a a a a
PS
a a a a a a a
a a a a a a a
a a a a a a a
a a a a a a a
a a a a a a a
2L+
a a a a a
a a a a a
a a a a a
a a a a a
a a a a a
2L
-
a a a a a
a a a a a
a a a a a
a a a a a
a a a a a
PE
Control power
supply
24 V DC load power
supply
a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a
External connection for
uniform reference potential
a a a a
a a a a
a a a a
a a a a
a a a a
a a a a a a
a a a a a a
a a a a a a
a a a a a a
a a a a a a
Data
a a a a a a
a a a a a a
a a a a a a
a a a a a a
a a a a a a
Mint
a a a a a
a a a a a
a a a a a
a a a a a
a a a a a
Uint
Voltage drop on line must not exceed 1 V, otherwise the reference potentials will shift and result
in failures of the module.
3-30
EWA 4NEB 812 6115-02b
Summary of Contents for SIMATIC S5-90U
Page 6: ...EWA 4NEB 812 6115 02b ...
Page 16: ...EWA 4NEB 812 6115 02b ...
Page 23: ......
Page 32: ...EWA 4NEB 812 6115 02b ...
Page 46: ...EWA 4NEB 812 6115 02b ...
Page 50: ......
Page 51: ......
Page 52: ......
Page 53: ......
Page 54: ......
Page 55: ......
Page 57: ......
Page 58: ......
Page 59: ......
Page 64: ......
Page 65: ......
Page 66: ......
Page 67: ......
Page 89: ......
Page 102: ...EWA 4NEB 812 6115 02b ...
Page 118: ...EWA 4NEB 812 6115 02b ...
Page 242: ...EWA 4NEB 812 6115 02b ...
Page 288: ...EWA 4NEB 812 6115 02b ...
Page 300: ...EWA 4NEB 812 6115 02b ...
Page 362: ...EWA 4NEB 812 6115 02b ...
Page 536: ...EWA 4NEB 812 6115 02b ...
Page 538: ...EWA 4NEB 812 6115 02b ...
Page 540: ...EWA 4NEB 812 6115 02b ...
Page 562: ...EWA 4NEB 812 6115 02b ...
Page 564: ...EWA 4NEB 812 6115 02b ...
Page 590: ...EWA 4NEB 812 6115 02b ...
Page 596: ...EWA 4NEB 812 6115 02b ...
Page 598: ...EWA 4NEB 812 6115 02b ...
Page 604: ...EWA 4NEB 812 6115 02b ...
Page 606: ...EWA 4NEB 812 6115 02b ...
Page 608: ...EWA 4NEB 812 6115 02b ...
Page 610: ...EWA 4NEB 812 6115 02b ...
Page 620: ...EWA 4NEB 812 6115 02b ...