LOGO! manual
EWA 4NEB 712 6006-02
94
5.5.2 Previous solution
B1
L1
N
E1
E1
lx>
K6
E5
K5
E4
K4
E3
K3
E2
K3 K4
K5 K6
S1 S2
S3 S4
K1 K2
K4K4K4
The lights are operated by means of a pulse relay controlled by the switches
at the door. Independently of this, they are reset by the time switch (clock)
or by the brightness-sensitive switch via the central off input. The switch-
ing-off commands must be cut by impulse relays so that it is still possible to
switch the lights on and off locally after they have been switched off cen-
trally.
Components required:
S Switches S1 to S4
S Daylight control switch B1
S Time switch (clock) E1
S Impulse relays K1 and K2
S Remote-control switches with central off K3 to K6
Disadvantages of the previous solution
S To implement the required functions, a large amount of circuitry is re-
quired.
S The large number of mechanical components means that considerable
wear and high maintenance costs can be expected.
S Functional changes are costly to implement.
Applications
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