Siemens SIMATIC ET 200AL - 2 xCount Pin Assignments; Counting Channel Pinouts (2 xCount)

Connecting
5.2 Operation of the ET 200AL on grounded/non-grounded infeed
Distributed I/O system
32 System Manual, 02/2018, A5E31861578-AF
Components and protective measures
Various components and protective measures are stipulated for setting up a complete plant.
The types of components and the degree to which the protective measures are mandatory
depend on the IEC regulation that applies to your plant setup.
The following table shows the components of the electrical configuration with reference to
the previous figure and compares the IEC regulations.
Table 5- 1 Components of electrical configuration
Reference to
illustration
IEC 60364
(DIN VDE 0100)
IEC 60204
(DIN VDE 0113)
Disconnection ele-
ment for controller,
sensors, and actua-
tors
①
Main switch Disconnector
Short-circuit / over-
load protection
②
Single-pole protection of
circuits
Secure all incoming supply
cables with a circuit breaker
(24 V DC/4 A).
Secure with one pole with a
grounded secondary circuit
Cable protection
③
Protection of cables and
wires against overcurrent
-
Insulation monitoring
In the following situations, you must provide insulation monitoring.
● When configuring the ET 200AL distributed I/O system with non-grounded reference
potential
● When hazardous system conditions may occur due to errors