Siemens ET 200S Manual page 411

Table 12-69 Behavior of the Analog Modules Depending on the Position of the Analog Input Value in the
Value Range
Measured Value in
Rated range
Overrange/underrange
Overflow
Underflow
Before assigning parameters or
in the case of incorrect parameter
1
assignment
1
The following applies to 2AI U Standard, 2AI I 2WIRE Standard, 2AI I 4WIRE Standard, 2AI RTD Standard,
and 2AI TC Standard with product version 1: If you assign a parameter incorrectly and trigger the
diagnostic message for a parameterization error (for example, wire break for measuring range " 20 mA),
the SF LED lights up on the module and you can evaluate the diagnosis. In this state, correct input values
are delivered to the DP master.
Effect of the Value Range for the Analog Output
The behavior of the electronic modules with analog outputs depends on where the
output values are in the value range. The following table indicates this:
Table 12-70 Behavior of the Analog Modules Depending on the Position of the Analog Output Value in the
Value Range
Output Value in
Rated range
Overrange/underrange
Overflow
Underflow
Before assigning parameters or in the case of incorrect
1
parameter assignment
1
The following applies to 2AO U Standard, 2AO I Standard with product version 1: If the substitute value
that was assigned as parameter is outside the nominal range, a diagnostic message for parameter error
is entered and the SF LED lights up. In this state, the output values transmitted by the DP master are output
at the analog output modules.
Distributed I/O System ET 200S
EWA 4NEB 780 6024-02 07
Input Value in SIMATIC S7
Format
Measured value
Measured value
7FFF
H
8000
H
7FFF
H
Output Value in SIMATIC S5/S7 Format
Value from DP master
Value from DP master
0 signal
0 signal
0 signal
Analog Electronic Modules
Input Value in SIMATIC S5
Format
Measured value
Measured value
End of the overrange +1 plus
overflow bit
End of the underrange –1 plus
overflow bit
7FFF
H
12-55