Siemens SIMATIC TI505 Instrukcja Obsługi Pobierz pdf (Strona 28)

Product Overview

1-12

High Speed Counter Encoder Module User Manual

1.6 24-Bit Counters Quadrature Mode Outputs

You

can select one of four output options, (see Figure 1-9) for the output

signal of each 24-bit counter (Counter 1, Output 1; and Counter 4, Output

5).

In quadrature counting modes, the internal clocking for the Compare, Carry

and Borrow pulses produce a pulse width insufficient to drive the outputs.

See Figure 1-9. Compare Toggle and Compare Latch are the only signals

that can drive the output circuitry

The Carry T

oggle output changes state when the count overflows. After a

counter reset, the Carry T

oggle output is on. Set the output jumper to

Compare.

The Borrow T

oggle output changes state when the count underflows. After a

counter reset, the Borrow T

oggle output is on. Set the output jumper to

Compare T

oggle.

In all module counting modes, the PLC can read the Compare T

oggle, Carry

oggle and Borrow Toggle flags in Status Word WX17. T

able 1-1 and

able 1-2 summarize the active outputs for various counter modes.

The Compare T

oggle jumper selects a signal that changes state on the next

count after the count value equals the preset value. This signal appears on

Output 1 (Channel 1) or on Output 5 (Channel 2). After counter reset, the

output signal is on.

The Compare Latch jumper selects a signal that is active when the count

value equals the preset value; the signal remains active until reset by the

PLC or by the second preset (Preset 2 or Preset 6). This signal appears on

Output 1 (Channel 1) or on Output 5 (Channel 2). After counter reset, the

output signal is Off.

Outputs in

Quadrature

Modes

Carry T

oggle

Output

Borr

ow T

oggle

Output

Compar

e T

oggle

Output

Compar

e Latch

Output

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 126 127

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