Siemens SIMATIC Manual page 631

electrically interconnected
The reference potential of the control and load voltage circuits of non-isolated IO modules
are electrically interconnected.
Equipotential bonding
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.
FREEZE
STEP 7 parameter for the SM 338; POS-INPUT position detection module. FREEZE is a
control command (function), used to freeze actual encoder values of SM 338.
Ground
The conductive earth whose electrical potential can be set equal to zero at any point.
Ground potential may be different from zero in the area of grounding electrodes. The term
"reference ground" is frequently used to describe this situation.
grounding
Grounding means, to connect an electrically conductive component via an equipotential
grounding system to a grounding electrode (one or several conductive components with low
impedance contact to earth.)
Hardware interrupt
Function initiated by interrupt-triggering modules, based on specific events in the process
(high or low limit violated, module has completed cyclic conversion of channels.)
The hardware interrupt is reported to the CPU, The CPU executes the assigned →
Organization block according to interrupt priority.
Hold last value (HLV)
The module retains the last value output before the CPU went into STOP.
S7-300 Module data
Manual, 06/2017, A5E00105505-AJ
Glossary
631