Siemens SIMATIC ET 200S Manual - Halaman 21

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Non-isolated measuring sensors

The non-isolated measuring sensors are connected to the local ground potential. You must

connect M

potential differences U

measuring points.

If the permitted value for U

between the measuring points.

The following figure illustrates the connection of non-isolated measuring sensors to a floating

analog input module.

①

②

③

④

⑤

Sensor selection

Note the following factors when selecting the sensors:

● Length, impedance, and capacitance of the cable

● Reaction speed of the utilized sensors

2AI U HS analog electronic module (6ES7134-4FB51-0AB0)

Manual, 04/2007, A5E01076015-01

to the ground potential. Depending on local conditions or interference,

ANA

(static or dynamic) can occur between the locally distributed

Logic

Backplane bus

Ground bus

Equipotential bonding cable

Non-isolated measuring sensors

Note

When a sensor is connected or a wire break is repaired during a measuring operation,

false measurements and false diagnostics can occur on both inputs if the permissible

input current is exceeded.

is exceeded, there must be equipotential bonding conductors

5.1 Connecting measuring sensors

Connecting