Technical Specifications
7-105
ET 200X Distributed I/O Device
EWA 4NEB 780601602-06
EM 144 AI 2 x RTD, response in the event of a wire break
If a wire break occurs on one of the EM 144 AI 2 x RTD expansion module’s
channels, the measured values on the expansion module’s other channel may be
corrupted. When this happens in S5 format, the overflow bit is set and the value
06E6
H
is loaded; in S7 format the value 7FFF
H
is loaded.
Effect of the value range for the analog output
The behavior of the expansion modules with analog outputs depends on where the
output values are in the value range. The following table indicates this:
Table 7-61 Behavior of the analog modules depending on the position of the analog output value in the
value range
Output value in Output value in SIMATIC S
5/S7 format
SF LED Diagnostic
data area of
the module
Interrupt
Rated range Value from DP master – – –
Overrange/underrange Value from DP master – – –
Overflow 0 signal – – –
Underflow 0 signal – – –
Before parameterization
or in the event of incor-
rect parameterization
0 signal On* – –
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