Rockwell-automation 1769-HSC Compact High Speed Counter Module Manual de usuario descargar pdf (Pagina 21)

Rockwell Automation Publication 1769-UM006E-EN-P - July 2013 21

Module Operation Chapter 2

Operational Mode

Selection

A count channel’s operational mode configuration selection determines how the

A and B inputs cause a counter channel to increment or decrement. The six

available mode selections are the following:

• Pulse/External Direction Input

• Pulse/Internal Direction Input

• Up and Down Pulse Input

• X1 Quadrature Encoder Input

• X2 Quadrature Encoder Input

• X4 Quadrature Encoder Input

See

Figure 2 on page 19 for the operational modes available for the counters,

based on the number of counters configured.

Direction Inhibit and Direction Invert Output Control Bits

These bits apply to all of the counter modes.

IMPORTANT

The operational mode selection is limited by the number of counters

selected.

• With two counters selected, Counters 0 and 1 can be assigned any

operational mode.

• With three counters selected, Counter 0 can be assigned any mode,

but Counters 1 and 2 can only be configured as pulse/internal

direction.

• With four counters selected, all counters must be configured for the

pulse/internal direction mode.

TIP

When set, the Direction Inhibit bit disables any physical input from

affecting count direction.

When set, the Direction Invert bit changes the direction of the counter in

all operational modes.

When Direction Inhibit is set, then Direction Invert is the direction.

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Rockwell-automation 1769-HSC Compact High Speed Counter Module Manual de usuario Pagina 21