For example:
-X0 36
and
-X0 37
. In the example illustrated here the
component identification
"-X0"
for the left plug symbol is also valid
for the right plug symbol.
4.1.2.3
Identification of switch blocks
Fig. 62
F Direction
n
For normally open contacts the contact symbols
_3/_4
are
used.
n
For normally closed contacts the contact symbols
_1/_2
are
used.
In combination with the contact block numbering described above
each individual connection is clearly defined.
Example:
The contact block marked with
4
is called
4
3/44, if it is a normally
open contact and
4
1/42, if it is a normally closed contact.
The contact block marked with
2
is called
2
3/24, if it is a normally
open contact and
2
1/22 , if it is a normally closed contact.
The contact block marked with
1
is called
1
3/14, if it is a normally
open contact and
1
1/12, if it is a normally closed contact.
The contact block marked with
5
is called
5
3/54, if it is a normally
open contact and
5
1/52, if it is a normally closed contact.
Switches of modular design
Electric systems – Basic principles
BW 900-50
79
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