Siemens SIMATIC ET 200SP HA Manuel D'utilisation page 46

Black terminal blocks form a separate potential group.
Note
Terminal block type F1, H0, M0, F0, S0 and R0
• The terminal blocks do not form potential groups with the terminal blocks plugged after them.
• The missing power bus function is indicated by the black housing color of the terminal blocks.
• Dark-gray terminal blocks must not be plugged to the right of these terminal blocks.
If you replace a light-gray terminal block with a dark-gray terminal block, the potential groups are connected to one another.
Note
Voltage in a potential group
• A mixed configuration of I/O modules with different signal voltage is allowed within a potential group.
• The supply voltage for all I/O modules is 24 V DC.
The following potential relationships are valid in the IO device based on the ET 200SP HA distributed I/O system:
Same potential:
• The same potential exists only for the supply voltages of the I/O modules of a potential group.
Electrical isolation exists between:
• The electric circuits of the supply voltage/process signals and all other circuit components of the IO device.
• The communication interfaces of the interface module (PROFINET) and all other circuit components of the IO device.
The terminal blocks are wired individually except for the D-SUB terminal block. This is connected using a 37-pin D-SUB
connector (female). The D-SUB terminal block is suitable for I/O modules with a nominal signal voltage of 24 V DC.
When D-SUB terminal blocks are used, the permissible potential difference is limited to voltages/currents from voltage/power
supplies with protection by electrical separation (SELV/PELV according to IEC/UL 61010-2-201) with nominal value 24 V DC +-
20% U=.
You can find rated and maximum values for the inputs and, if applicable, the sensor supply in the technical data sheet of the
respective products.
You can find rated and maximum values for the outputs and, if applicable, the relay contact, in the technical specifications of
the respective products.
You can find the insulation voltages for the channels in the technical specifications of the respective products.
When D-SUB terminal blocks are used, the insulation strength between channels and between the channels and the load
voltage is reduced to a test voltage of 1 200 V DC / 1 min.
Note
When selecting the D-SUB signal cables and plug-in connectors, note also the specified insulation strength between the
individual cores/pins. These values affect the insulation strength between channels and between the channels and the load
voltage.
The channels are protected against short-circuit.
Thus, the master/slave supply does not have to be additionally protected.
For the 32-channel modules, you can protect the master/slave supplies individually by using the terminal block with potential
distributor.
The terminal block with potential distributor (L+ potential) offers the following features:
• Separate fuse protection so that, in the event of a short circuit or overload, "only" the affected channel fails.
• A failure does not affect the whole system.
The L+ terminals on the potential distributor are individually fuse-protected to a maximum of 20 mA by resettable fuses.
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ET 200SP HA Distributed I/O System
A5E52222765-AB, 11/2024