Siemens SIMATIC ET 200X, Manual

Page: 292 / 362

Technical Specifications
7-104
ET 200X Distributed I/O Device
EWA 4NEB 780601602-06
Supply voltage On/Off
A failure of the supply voltage to the electronics/sensors on the ET 200X is always
displayed by the ”ON” LED on the basic module and also entered in the diagnostic
data area of the basic module.
!
Caution
When the supply voltage for electronic components/sensors on the ET 200X is
switched on/off, incorrect interim values may be obtained temporarily at the analog
outputs.
Effect of the value range for the analog input
The behavior of the expansion modules with analog inputs depends on where the
input values are in the value range. The following table indicates this:
Table 7-60 Behavior of the analog modules as a function of the position of the analog output value
Measured va-
lue in
Input value in
SIMATIC
S7 format
Input value in
SIMATIC
S5 format
SF LED Diagnostic
data area of
the module
Interrupt
in the rated
range Measured
value Measured
value – – –
in the over-
range/under-
range Measured
value Measured
value – – –
in the overflow 7FFF
H
End of the
ove1
plus overflow
bit On* Entry per-
formed*
Diagnostic in-
terrupt**
in the under-
flow 8000
H
End of the un-
derrange –1
plus overflow
bit On* Entry per-
formed*
Diagnostic in-
terrupt**
Outside the up-
per or lower
limit value Measured
value Measured
value – – Hardware inter-
rupt**
Before parame-
terization or in
the event of in-
correct para-
meterization 7FFF
H
7FFF
H
On* – –
* When the ”group diagnosis” parameter has been enabled in the configuration software
** When the diagnostic or hardware interrupt has been enabled in the configuration software