Siemens SIMATIC ET 200AL System Manual page 174

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
Disconnection ele-
ment for controller,
sensors, and actuators
Short-circuit / over-
load protection
Cable protection
Insulation monitoring
You must provide insulation monitoring in the following cases:
• In the configuration of the IO-Link system with ungrounded reference potential
• When hazardous system conditions may occur due to errors
IO-Link I/O modules
System Manual, 08/2021, A5E48755395-AB
5.2 Operation of the IO-Link I/O modules on a grounded/ungrounded infeed
Components of electrical configuration
Reference to
illustration
①
②
③
IEC 60364
(DIN VDE 0100)
... Part 460:
Main switch
.... Part 725:
Single-pole protection of
circuits
... Part 430:
Protection of cables and
wires against overcurrent
Protect all incoming supply
cables with a circuit breaker.
Connecting
IEC 60204
(DIN VDE 0113)
... Part 1:
Disconnectors
... Part 1:
Single-pole protection of
grounded secondary circuit
... Part 1:
Overcurrent protection
31