Siemens SIMATIC ET 200S - Block Diagram of the 2 AI RTD Standard

Analog Electronic Modules
12-80
ET 200S Distributed I/O System
EWA-4NEB 780602402-12
Block diagram
Backplane bus
ET 200S
backplane bus
interface
connection
ADC
M
ANA
24V
L+
1M
1
2
5
6
7
3
8
4
P1
P2
MUX
MUX
Figure 12-16 Block diagram of the 2AI RTD Standard
Technical data
Dimensions and weight
Dimensions W x H x D
(mm)
15 x 81 x 52
Weight Approx. 40 g
Module-specific data
Supports clock synchro-
nized mode
No
Number of inputs 2
Cable length
• shielded max. 200 m (164 ft)
Voltages, currents, electrical potentials
Rated load voltage L+ (from
power module)
24 VDC
• Polarity reversal
protection
Yes
Transducer power supply Yes
• Constant power supply
for resistive sensors
Approx. 1.5 mA
• Short-circuit protection Yes
Electrical isolation
• Between channels and
backplane bus
Yes
• Between channels and
load voltage L+
Yes
• Between the channels No
Permitted potential differ-
ence
• Between M
ANA
and the
central ground point
(U
ISO
)
75 VDC / 60 VAC
Isolation tested 500 VDC
Current consumption
• with load voltage L+ max . 3 0 mA
Power loss of the module Typical 0.6 W
Status, interrupts, diagnostics
Diagnostic functions
• Group error red LED ”SF”
• Reading of diagnostics
functions
Yes