Changing The Direction Ofcounting; Changing The Directionofcounting - Siemens SIMATIC S5 IP 281 Equipment Manual

Commissioning the Counter Modu/e
Changing the Direction of Counting
5.5
The direction of counting is determined by two different methods depending on the type of pulse
evaluation. When encoders with two pulse trains displaced by 90" (counting pulse evaluation
and B (+ section 6,2,2).
By inverting the input signals while retaining the same direction of rotation of the encoder, the direc-
tion of counting can be changed without having to change the wiring. The inversion is set in the
parameter register of the respective counter.
Parameter Register 1/2
10
15 14 13 12 11 9
When encoders with one pulse train (counting pulse evaluation EVDI) are used, the direction of
counting is specified by the level at counting input B or by bit 11. Inversion is specified at counting
input B (+ section 6.2.2).
5 – 8
8 7 6 5 4 3 2
O: Not inverted
1: Inverted
O: Not inverted
1: Inverted
1 0
R 11192