User manual

Basic circuits
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Table 21: Two-way circuit (XOR)
Self-latching
A combination of a series and parallel connection is used to
wire a latching circuit.
Latching is established by contact Q1 which is connected in
parallel to I1. If I1 is actuated and reopened, the current flows
via contact Q1 until I2 is actuated.
Table 22: Self-latching
Latching circuits are used to switch machines on and off. The
machine is switched on at the input terminals via make
contact S1 and is switched off via break contact S2.
I1 I2 Q1
000
01
1
101
11
0
I1uI2----ÄQ1
Q1k
S1 make contact at I1
S2 break contact at I2
I1 I2 Contact Q1
Coil Q1
000 0
010
0
100
0
110
1
001
0
011
1
101
0
111
1
EZ500_700.book Page 183 Tuesday, May 3, 2005 5:15 PM