Analog Electronic Modules
12-104
Distributed I/O System ET 200S
EWA 4NEB 780 6024-02 07
Block Diagram
Backplane bus
ET 200S
backplane bus
interface module
ADC
M
ANA
24 V
L+
1M
1
2
5
6
7
3
8
4
P1
P2
MUX
MUX
Figure 12-15 Block Diagram of the 2AI RTD Standard
Technical Specifications
Dimensions and Weight
Dimensions W H D
(mm)
15 x 81 x 52
Weight Approx. 40 g
Data for Specific Modules
Number of inputs 2
Length of cable
Shielded Max. 200 m
Voltage, Currents, Potentials
Rated load voltage L+ (from
the power module)
24 VDC
Reverse polarity
protection
Yes
Power supply of the trans-
mitters
Yes
Constant-current supply
for resistance-type
sensors
Approx. 1.5 mA
Short-circuit protection Yes
Isolation
Between the channels
and backplane bus
Yes
Between the channels
and load voltage L+
Yes
Between the channels No
Permissible potential diffe-
rence
Between M
ANA
and the
central grounding point
(U
ISO
)
75 VDC/60 VAC
Insulation tested 500 VDC
Current consumption
From load voltage L+ Max. 30 mA
Power dissipation of the
module
Typ. 0.6 W
Status, Interrupts, Diagnostics
Diagnostic functions
Group error Red “SF” LED
Diagnostic functions
readable
Yes
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