Siemens SIMATIC ET 200SP - Page 28

System overview
3.4 Components
Distributed I/O system
System Manual, 09/2019, A5E03576849-AJ
27
Basic component
Function
Figure
BaseUnit The BaseUnits provide the electrical and me-
chanical connection of the ET 200SP modules.
Place the I/O modules or the motor starter onto
the BaseUnits.
Suitable BaseUnits are available in each case
for the different requirements. You can find addi-
tional information in section Selecting the Ba-
seUnit for I/O modules (Page 38).
PotDis-BaseUnit poten-
tial distributor module
You use the potential distributor module to dis-
tribute a variety of potentials (P1, P2). This al-
lows you to implement a multi-cable connection
without external terminals with 16-channel digital
modules.
The assembly has two parts:
• If you need additional potential terminals,
plug a PotDis-TerminalBlock in the PotDis-
BaseUnit.
• Alternatively, plug a BU cover (15 mm) on
the PotDis-BaseUnit.
With potential distributor modules, you may only
connect to the PotDis-TB versions BR-W and
n.c.-G potential, which exceed the voltage level
of SELV/PELV. Other SELV/PELV potential
groups should be separated with light-colored
PotDis BUs.
Suitable PotDis-BaseUnits are available in each
case for the different requirements. You can find
additional information in section
Selecting a
PotDis-BaseUnit (Page 44).
PotDis-TerminalBlock If you need additional potential terminals for a
PotDis-BaseUnit, plug a PotDis-TerminalBlock in
the PotDis-BaseUnit.
Voltages greater than SELV/PELV are only
permitted for the PO PotDis-TBs BR (bridged)
and NC (not connected). The same applies to
PE. Voltages at the terminals of the PotDis
modules connected to the P1/P2 rails must not
be greater than SELV/PELV.
Suitable PotDis-TerminalBlocks are available in
each case for the different requirements. You
can find additional information in section
Select-
ing a PotDis-TerminalBlock (Page 46).