Siemens SIMATIC S7-1500 Function Manual page 76

Example - Evaluation of the value status for the input channel of an analog input module
The example below shows the basic evaluation of the value status for the input channel of
an analog input module in the user program. The diameter of a cylinder is measured by
means of a channel and its circumference is calculated.
● If the value status indicates the channel is error-free, the circumference is to be
calculated.
● If the value status indicates the channel is defective, the value "0" is to be output as
substitute value for the circumference.
The figure below shows the evaluation of the value status in the user program.
Figure 5-2 Example - Evaluation of the value status in the user program
Additional information
Depending on the I/O module, the value status reserves different addresses in the process
image input. The manual for the module used includes specific information on the
assignment and arrangement.
Diagnostics
Function Manual, 11/2019, A5E03735838-AF
System diagnostics by means of the user program
5.2 System diagnostics using process image inputs
75