Distributed I/O System ET 200S

Analog electronics modules
4.4 Response of the analog modules during operation and if faults occur
4.4.2 Influence of the Value Range on the Analog Input
The response of the electronics modules with analog inputs depends on the part of the value
range in which the input values are located. The table below shows this dependency..
Table 4-28 Response of the Analog Modules, Depending on the Location of the Analog Input Value in the Range of
Values
Measured value within ... Input value in SIMATIC S7 Format Input value in SIMATIC S5 Format
Rated range Measured value Measured value
Overshoot/undershoot range Measured value Measured value
Overflow 7FFFH End of overshoot range +1 plus
overflow bit
Underflow 8000H End of undershoot range -1 plus
overflow bit
Before setting parameters or with faulty
parameters 1
7FFFH 7FFFH
1 With 2AI U Standard, 2AI I 2WIRE Standard, 2AI I 4WIRE Standard, 2AI RTD Standard, 2AI TC Standard with product
status 1 applies: If the parameter setting error diagnostics message is triggered because of incorrect parameter setting
(e.g. wire break in measuring range ± 20 mA), the SF LED on the module lights and the diagnosis can be evaluated. In this
status correct input values are sent to the DP master.
4.4.3 Influence of the Value Range on the Analog Output
The response of the electronics modules with analog outputs depends on the part of the
value range in which the output values are located. The table below shows this dependency..
Table 4-29 Response of the Analog Modules, Depending on the Location of the Analog Output Value in the Range of
Values
Output Value is in ... Input value in SIMATIC S5/S7 format
Rated range Value from DP master
Overshoot/undershoot range Value from DP master
Overflow 0-signal
Underflow 0-signal
Before setting parameters or with faulty parameters1 0-signal
1 With 2AO U Standard, 2AO I Standard with product status 1 applies: If the configured substitute value is outside the
nominal range, a diagnostics message for a parameter setting error is registered and the SF LED lights. In this status the
output values transferred from the DP master are output at the analog output modules.
ET 200S
4-26 Manual, 12/2005, A5E00514527-03