Siemens SIMATIC ET 200eco PN Operating Instructions Manual page 31

Components and protective measures
Various components and protective measures are stipulated for plant installation. The type of
components and the degree to which the protective measures are mandatory depend on the
DIN VDE regulation that applies to your plant configuration. The next table refers to the
diagram below.
Compare ...
Disconnecting device for
controller, sensors, and
actuators
Short-circuit and over-
load protection
Line protection
Safe electrical isolation
Safety isolation is required for:
● Modules which must be supplied with ≤ 60 V DC or ≤ 25 V AC
● 24 V DC load circuits
Configuring ET 200eco PN with grounded reference potential
Any interference currents generated within an ET 200eco PN configuration with grounded
reference potential are discharged to protective earth. The terminals must be connected
externally (see the figure "Grounding concept for ET 200eco PN": Connection between 1M
and FE).
Configuring ET 200eco PN with ungrounded reference potential
In an ET 200eco PN configuration with ungrounded reference potential, any interference
currents will be discharged to protective ground via an internal RC circuit (see the figure
"Grounding concept for ET 200eco PN": No connection between 1M and FE).
ET 200eco PN
Operating Instructions, 08/2016, A5E01250250-AJ
3.2 Operating ET 200eco PN on grounded mains
Reference to the DIN VDE 0100
diagram
(1) ... Part 460:
"Grounding Main switch
concept for
ET 200eco PN"
(2) ... Part 725:
"Grounding Single-pole protec-
concept for tion of circuits
ET 200eco PN"
... Part 430:
Protection of cables
and lines against
over-current
DIN EN 60204
... Part 1:
Disconnect switch
... Part 1:
with grounded secondary pow-
er circuit: single-pole protection
-
Wiring
31