Rockwell-automation 1769-HSC Compact High Speed Counter Module Instrukcja Użytkownika Pobierz pdf (Strona 23)

Rockwell Automation Publication 1769-UM006E-EN-P - July 2013 23

Module Operation Chapter 2

See Direction Inhibit and Direction Invert Output Control Bits on page 21 for

more information.

Pulse/Internal Direction Mode Selection

When the Pulse/Internal Direction mode is selected, the status of the Direction

Invert bit, as controlled by the user program, determines the direction of the

counter. The counter increments on the rising edge of the module’s A input

when the Direction Invert bit is reset (0). The counter decrements on the rising

edge of the A input when the Direction Invert bit is set (1).

Table 2 - Pulse External Direction Counting

Direction

Inhibit Bit

Direction

Invert Bit

Input A (count) Input B (direction) Change in

Count Value

00 0 or open 1

 1-1

0, 1,  Don’t care 0

01 0 or open -1

 11

0, 1,  Don’t care 0

10 0 or open 1

 11

0, 1,  Don’t care 0

11 0 or open -1

 1-1

0, 1,  Don’t care 0

Table 3 - Pulse Internal Direction Counting - Counters 0 and 1

Direction

Inhibit Bit

Direction

Invert Bit

Input A (count) Input B Change in Count

Value

Don’t care 0  Don’t care 1

0, 1,  Don’t care 0

Don’t care 1  Don’t care -1

0, 1,  Don’t care 0

Table 4 - Pulse Internal Direction Counting - Counters 2 and 3

Direction

Inhibit Bit

Direction

Invert Bit

Input A Input B (count) Change in Count

Value

Don’t care 0 Don’t care  1

Don’t care 0, 1,  0

Don’t care 1 Don’t care  -1

Don’t care 0, 1,  0

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 169 170

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