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XG or ZG - Binary signals conditioned by an Input module
Normally open contact (NOC) & normally closed contact (NCC)
Signals in this signal area originate from a floating contact, i.e. switch or relay
contact. The serial numbers are assigned depending on the type of floating
contact. The type of floating contacts include: normally open contacts (NOC) and
normally closed contacts (NCC). A definition of each according to the KKS
system is given below:
NOC
Normally open contact; the switching element is in the normally open
state when the...
- switch is not mechanically actuated
- relay is dropped out or de-energized
The contact will close when the...
- switch is mechanically actuated
- relay is picked up or energized
NCC
Normally closed contact; the switching element is in the normally
closed state when the...
- switch is not mechanically, actuated
- relay is dropped out or de-energized
The contact will open when the...
-
switch is mechanically actuated
-
relay is picked up or energized
Serial number assignments for NOC and NCC
The KKS system assigns a different range of serial numbers to signals in the XG
and ZG signal areas depending on the type of contact used. In the following
explanations only the XG signal area is mentioned, although the same rules
apply for the ZG signal area.
The serial numbers 01 to 49 are assigned to signals which are derived from
normally open contacts (NOC). The serial numbers 51 to 99 are assigned to
signals which are derived from normally closed contacts (NCC).
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