V01.00 | 2019/10
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6.5
Grounding the device
6.5.1
Equivalent wiring diagram and shielding concept
The equivalent circuit diagrams and shielding concepts of the TBEN-S module variants are
shown in the following figures:
X1
C0
C1
C2
C3
P1
X2
P2
Fig. 15: TBEN-S2-4IOL– equivalent wiring dia-
gram and shielding concept
6.5.2
Fieldbus and I/O level shielding
The fieldbus and the I/O level of the TBEN-S modules can be grounded separately.
1
2
3
4
5
Fig. 16: Fieldbus and I/O level shielding
The grounding ring (2) and the grounding contact (4) are connected to each other and form
the module grounding. The shielding of the I/O level is permanently connected to the module
grounding. The module grounding is only connected to the reference potential of the installa-
tion when the module is mounted.
Shielding concept of the I/O modules (I/O level)
In the case of direct mounting on a mounting plate, the module grounding is connected to the
reference potential of the system via the metal screw in the lower mounting hole (3). If module
grounding is not desired, the electrical connection to the reference potential must be interrup-
ted, e.g. by using a plastic screw.
In the case of DIN rail mounting, the module earthing is led through the side grounding contact
( 4 ) via connector TBNN-S0-DRS to the top-hat rail and connected to the reference potential of
the installation. If module grounding is not desired, the electrical connection to the reference
potential must be interrupted, e.g. by using a plastic screw.