Measuring Methods And Measuring Ranges Of The Sm 331; Ai 8 X Rtd - Siemens SIMATIC S7-300 Reference Manual
Programmable logic controllers module data
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- Manual (676 pages) ,
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Prolongation of the scan time with a wire-break check
The wire-break check is a software function of the module that is available in all
operating modes.
In the 8-channel hardware and software filter operating modes, the scan time
of the module is doubled, irrespective of the number of channels for which
wire-break has been enabled.
In the 4-channel hardware filter operating mode, the module interrupts
processing of the input data 170 ms and performs a wire-break check. In other
words, each wire-break check prolongs the scan time of the module by 170 ms.
Smoothing of the measured values
You fill find information that is generally applicable to the smoothing of analog
values in Section 4.6.
Special characteristic with short-circuit to M or L
If you short an input channel to M or L, the module does not suffer any damage.
The channel continues to issue valid data; neither is a diagnosis reported.
Diagnostics
You will find the diagnostic messages that are grouped under the "group diagnosis"
parameter in Table 4-46, on page 4-72.
4.23.2
Measuring Methods and Measuring Ranges of the
SM 331; AI 8 x RTD
Measuring Methods
You can set the following measuring methods for the input channels:
• RTD 4-conductor measurement
• RTD 3-conductor measurement
• Resistor 4-conductor measurement
• Resistor 3-conductor measurement
You perform the setting with the "measuring method" parameter in STEP 7.
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Analog Modules
4-135
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