Siemens SIMATIC S7-400 Reference Manual page 453

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.
Temperature coefficient
Parameter in STEP 7 for analog input modules during when measuring temperature with
thermoresistors (RTD). The temperature coefficient is selected to suit the thermoresistor used
(according to DIN standard).
Temperature error
The temperature error is the drift of the measured/output values caused by changes in the
ambient temperature of the analog module. It is specified as a percentage per degree Kelvin
and relates to the nominal range of the analog module.
Temperature error of the internal compensation
The temperature error of the internal compensation occurs only when measuring with
thermoelements. It indicates the error that must be added to the actual temperature error when
the "internal reference" mode is selected. The error is specified either as a percentage of the
physical nominal range of the analog module or as an absolute value in °C.
Temporary data
Temporary data is → local data of a block that is entered in the L stack during execution of the
block and that is no longer available on completion of execution.
Total current
Total of all the currents of all output channels of a digital output module.
Unforce
→ Force
S7-400 Automation System Module Data
Reference Manual, Ausgabe 11/2016, A5E00850736-08
Glossary
453