Siemens SIMATIC ET 200S - Block Diagram of the 2 AI I 4 WIRE High Speed

Analog Electronic Modules
12-76
ET 200S Distributed I/O System
EWA-4NEB 780602402-12
Block diagram
Backplane bus
ET 200S
backplane bus
interface
connection
ADC
M
ANA
24 V
L+
1M
1
2
5
6
7
3
Current limit
8
4
P1
P2
MUX
Figure 12-15 Block diagram of the 2AI I 4WIRE High Speed
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
Yes
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
Electrical isolation
• Between channels and
backplane bus
Yes
• Between channels and
load voltage L+
No
• Between channels No
Permitted potential
difference
• between M
ANA
and
M
internal
(U
ISO
)
75 VDC, 60 VAC
Isolation tested with 500 V DC
Current consumption
• Power supply and load
voltage L+ (without
load)
max. 35 mA
1)
Power loss of the module Typical 0.8 W
Status, interrupts, diagnostics
Interrupts
• Process alarm Configurable
2)
Diagnostic functions
• Group error display red LED ”SF”
• Reading of diagnostic
data
possible
3)