Siemens SIMATIC S7-300 Reference Manual page 557
Programmable logic controllers module data
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Smoothing
Parameter in STEP 7 for analog input modules. The measured values are
smoothed by digital filtering. For specific modules it is possible to choose be-
tween no, low, medium and high smoothing. The higher the smoothing, the
greater is the time constant of the digital filter.
STARTUP
The STARTUP mode is transvered during the transition from STOP mode to
RUN mode. STARTUP can be triggered by the → Mode switch or following pow-
er-on or by means of an operator input on the programming device. With the
S7-300 and M7-300, a → Complete restart is performed.
Status mode
The SIMATIC S7 programmable logic controllers are familiar with the following of
status modes: STOP, → STARTUP, RUN and STOP.
Substitute value
Substitute values are values that can be output to the process when signal out-
put modules have failed or be used in the user program instead of a process
value when signal input modules have failed.
The substitute values can be assigned parameters by the user in STEP 7 (old
value retained, substitute value 0 or 1). They are values which the output(s) have
to output in the event of a CPU STOP.
System diagnostics
System diagnostics is the detection, analysis and reporting of errors that occur
within the programmable logic controller. Examples of such errors are: program
errors or failures on modules. System errors can be indicated with LED displays
or in STEP 7.
System function
A system function (SFC) is a function that is integrated in the operating system
of the CPU a function that can be triggered in the STEP 7 user program, if nec-
essary.
Temperature coefficient
Parameter in STEP 7 for analog input modules when measuring temperatures
with a resistance thermometer (RTD). The temperature coefficient you select
depends on the resistance thermometer being used (to DIN standard).
Temperature error
The temperature error identifies the drift of the measured/output value caused by
the change in the ambient temperature of the analog module. It is specified as a
percentage per Kelvin and relates to the rated range of the analog module.
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Glossary
Glossary-9
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