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Operating Modes and Functions
When the 24 V encoder interface is used, the direction of counting can be
specified via the "inversion at counting input B" bit in parameter register 1 /2,
without using input B*,
Parameter register 1/2
15 14 13 12 11
Inversion of the
Input signals A and B can be inverted. The setting is made in the
input signals
respective parameter register as shown below.
Parameter register 1/2
15 14 13 12 11
6 – 6
10
9
8
7
Inversion at counting input B
O: Counter is counting up.
1: Counter is counting down.
10
9
8
7
Inversion at counting input A
O: No inversion
1: Inversion
O: No inversion
1: Inversion
When incremental encoders with two pulse trains displaced by
one
inversion of
counting input,
counting inputs.
Caution
If the setting (inversion/no inversion) is changed while the
counter is running, the level change can cause an extra count-
ing pulse to be generated.
To avoid this error, the counter must be loaded
6
5
4
3
2
1
0
1
1
EVDI
6
5
4
3
2
1
0
be changed by the
without
having to rewire the
after
R 11/92
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