Name: Siemens SIMATIC S7-300 Module data
Brand: Siemens
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Analog Modules

4-149

Programmable Logic Controllers S7-300 Module Data

A5E00105505-03

Scan time of the module

In 4-channel hardware filter mode, the channel conversion time including the

communication time of analog input module SM331; AI 8 x TC is 10 ms. As the

module does not switch over between the channels in a group, the channel scan

time and the module scan time are the same: 10 ms.

Channel conversion time = channel scan time = module scan time = 10 ms

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 mode prolongs the

scan time of the module by 4 ms, 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 93 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.

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