
Glossary
S7-400 Automation System Module Data
466 Reference Manual, Edition 09/2009, A5E00850736-06
Shunt
Conductor connected in parallel in electric circuits.
Signal module
Signal modules (SMs) form the interface between the process and the automation system.
There are input modules, output modules, input/output modules (in each case, digital and
analog)
Smoothing
Parameter in STEP 7 for analog input modules. The measured values are smoothed by
digital filtering. It is possible to select between no, weak, medium and strong filtering for each
individual module. The stronger the smoothing, the higher the time constant of the digital
filter.
Standard communication
Communication over standardized protocols such as PROFIBUS-DP, PROFIBUS-FMS.
Static data
Static data is data that is used only within a → function block. This data is stored in an
instance data block belonging to the function block. Data stored in this way is retained until
the next function block call.
Substitute value
Substitute values are values that are output to the process or are used in the user program
instead of a process value if a signal output module is defective.
The substitute values can be selected by the user in the parameter settings in STEP 7
(retain old value, substitute value 0 or 1). Are the values to be output at an output or outputs
in the CPU changes to STOP.
SYNC
Control command from the → master to the → slave: freezes the outputs at their current
value.
System diagnostics
System diagnostics is the detection, evaluation and signaling of faults/errors occurring within
the automation system. Examples of such faults and errors include: Program errors or
failures on modules. System errors can be indicated by LEDs or in STEP 7.
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