Glossary
S7-300 Automation System Module data
Manual, 08/2006, A5E00105505-04
Glossary-7
Potential compensation
Electrical connection (equipotential conductor) of electrical equipment and external
conductive objects to the same or near to same potential, in order to prevent the
development of disturbance and dangerous potentials between those objects.
Process image
The CPU saves the signal states of analog IO modules to a process image.
We distinguish between the process image of inputs (PII) and outputs (PIO). The input
modules read the process image of inputs (PII) before the operating system executes the
user program. The operating system transfers the process image of outputs (PIO) to the
output modules at the end of program execution.
Product version
Differentiates products of the same order number. The product version is incremented in the
case of upwards compatible enhancements of functionality, production-specific changes (use
of new components/parts), and fixes.
Programming device
A programming device (PG) is a special compact PC (Personal Computer) suitable for use in
industry. A PG is fully equipped for programming SIMATIC automation systems.
Reaction to open thermocouple
STEP 7 parameter for analog input modules operating with thermocouples. This parameter
defines whether the module outputs an "Overflow" (7FFFH) or "Underflow" (8000H) value
when it detects an open thermocouple.
Reference junction
When operating thermocouples on analog input modules: point of known temperature
(for example, → compensating box.)
Reference potential
Potential from which the voltages of participating circuits are derived and measured.
Repeatability
Denotes the maximum deviation between measured/output values, if the same input or
output signal is repeatedly set. Repeatability refers to the rated range of the module, and
applies to its settled temperature state.
Repeater
Equipment used to amplify bus signals, and couple → bus segments across greater
distances
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