Electrical Structure Of The Et 200Eco System - Siemens SIMATIC ET 200eco Manual

Wiring
Overall structure of ET 200eco
Figure 3-1 shows the overall structure of an ET 200eco distributed I/O station
((Load supply voltages and grounding concept) with power supply from a TN-S
network.
L1
L2
L3
n
PE
for ET 200eco


with ECOFAST terminal block:
24 VDC NS

1M is not connected to PE in instal-
lations without grounding.
Figure 3-1 ET 200eco operation with reference potential bonded to equipotential earth
3.3

Electrical structure of the ET 200eco system

Isolated potential
The electrical circuit of an ET 200eco is galvanically separated between:
• 1L+ (electronic circuit/sensor supply):
Potential isolation to PROFIBUS-DP and 2L+ (load voltage supply),except I/O
module 8 DI/8 DO 2 A.
• 2L+ (load voltage supply):
Potential isolation to all other circuit elements execpt I/O module 8 DI/8 DO 2 A.
For I/O module 8 DI/8 DO 2 A, 1M and 2M are interconnected internally.
• PROFIBUS-DP interface:
Potential isolation to other circuit components.
3-4
PROFIBUS-DP
24 VDC 1 L+
AC
1
DC
M
Grounding bus
Low–voltage distribution,
e.g. in a TN-S system (3 400 V)
ET 200eco
Terminal block I/O module
A
mP
B
ET 200eco Distributed I/O Station
Data
M
internal
A5E00158716-02