Siemens ET 200S - Page 411

Analog Electronic Modules
12-55
Distributed I/O System ET 200S
EWA 4NEB 780 6024-02 07
Table 12-69Behavior of the Analog Modules Depending on the Position of the Analog Input Value in the
Value Range
Measured Value in Input Value in SIMATIC S7
Format
Input Value in SIMATIC S5
Format
Rated range Measured value Measured value
Overrange/underrange Measured value Measured value
Overflow 7FFF
H
End of the overrange +1 plus
overflow bit
Underflow 8000
H
End of the underrange –1 plus
overflow bit
Before assigning parameters or
in the case of incorrect parameter
assignment
1
7FFF
H
7FFF
H
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 12-70Behavior of the Analog Modules Depending on the Position of the Analog Output Value in the
Value Range
Output Value in
Output Value in SIMATIC S5/S7 Format
Rated range Value from DP master
Overrange/underrange Value from DP master
Overflow 0 signal
Underflow 0 signal
Before assigning parameters or in the case of incorrect
parameter assignment
1
0 signal
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.