Siemens SIMATIC ET 200SP HA System Manual page 19

Table 3-7 Terminal block
The selection of terminal blocks determines the following properties:
● Type of supply voltage
● Formation of potential groups
● Type of the required I/O module
● Redundant configuration of the I/O modules
● Terminal block with potential distributor
Select the terminal blocks according to the plant-specific require‐
ments.
You can find information on this in the section "Selecting a terminal
block for I/O modules (Page 32)".
Example illustration: Basic view of selected terminal blocks (dark-
colored type in this case)
Table 3-8 I/O module
With ET 200SP HA, the I/O modules are inserted in slots, which
arise from the combination of carrier module and terminal block. The
I/O modules detect the current process status or trigger correspond‐
ing reactions through the sensors and actuators connected to the
terminal block.
In addition to the standard modules (DI; DQ; AI; AQ), there are the
following types of modules:
● Relay module (RQ)
● Universal module
Note:
All I/O modules with a signal voltage up to 24 V can be used for IO
redundancy.
Table 3-9 Slot cover
Insert a slot cover on terminal blocks:
● When slots are not plugged with I/O modules.
● When slots are reserved for future expansion (as empty spaces).
You can insert a label strip for the planned I/O module on the front
of the slot cover.
ET 200SP HA Distributed I/O system
System Manual, 08/2019, A5E39261167-AD
Function
Function
Function
System overview
3.2 Basic components of the IO device
Figure
Figure
Figure
19