Analog Electronic Modules
12-19
ET 200S Distributed I/O System
EWA-4NEB 780602402-12
Isolated sensors
The isolated sensors are not connected to the local ground potential. They can be
operated potential-free. Local conditions or interference can cause potential
differences U
CM
(static or dynamic) between the M-- measuring lines of the input
channels and the reference point of the measuring circuit M
ANA
.
The following applies to ensure that the approved value for U
CM
is not exceeded
during operation in areas with high EMC interference:
•
with the 2AI U, 2AI I 4WIRE and 2AI TC analog input modules: Connect M--
with M
ANA
!
•
There must not be a connection from M-- to M
ANA
when connecting 2-wire
measurement transducers for current measurement and resistor sensors.
Isolated sensors, continued
Figure 12-1 shows the general connection of isolated sensors to the isolated
analog input modules..
Isolated
sensors
M+
:
M
L+
M--
M
ANA
M+
:M--
Backplane bus
ADC
Grounding busbar
U
ISO
Recommended
connection
U
CM
Central ground point
Logi
c
Figure 12-1
Connection of isolated sensors to an isolated analog input module.
Содержание SIMATIC ET 200S
Страница 42: ...Product Overview 1 16 ET 200S Distributed I O System EWA 4NEB 780602402 12 ...
Страница 64: ...Brief Instructions on Commissioning ET 200S 2 22 ET 200S Distributed I O System EWA 4NEB 780602402 12 ...
Страница 112: ...Configuration Options 3 48 ET 200S Distributed I O System EWA 4NEB 780602402 12 ...
Страница 232: ...Commissioning and Diagnostics 6 72 ET 200S Distributed I O System EWA 4NEB 780602402 12 ...
Страница 244: ...General Technical Specifications 7 12 ET 200S Distributed I O System EWA 4NEB 780602402 12 ...
Страница 274: ...Interface Modules 8 30 ET 200S Distributed I O System EWA 4NEB 780602402 12 ...
Страница 538: ...4 IQ SENSE 13 18 ET 200S Distributed I O System EWA 4NEB 780602402 12 ...
Страница 564: ...Address Space of the Input and Outputs of the ET 200S C 4 ET 200S Distributed I O System EWA 4NEB 780602402 12 ...
Страница 574: ...Response Times D 10 ET 200S Distributed I O System EWA 4NEB 780602402 12 ...
Страница 580: ...Special Measures for Interference Free Operation F 4 ET 200S Distributed I O System EWA 4NEB 780602402 12 ...
Страница 600: ...Product Information on the Use of subassemblies modules in a Zone 2 Hazardous Area 2 A5E00352937 02 ...