Siemens SIMATIC TI505 Instrukcja Obsługi Pobierz pdf (Strona 103)

Applications

A-8

High Speed Counter Encoder Module User Manual

Prescale Counting Applications (continued)

The

16-bit prescale 24-bit counting mode cascades the output of one 16-bit

counter

, in Divide-by-N mode, into the A input of the same channel’

s 24-bit

counter

. The B input jumper is set for Up Count Only

By using the repetitive nature of Divide-by-N mode, the output of the 16-bit

counter pulses the rollover signal, at every count of 1, into clock input A of

the 24-bit counter

. The output of the 16-bit counter is not controlled by the

Force Output On bit (WY19.09, .10, .13, or .14).

16-Bit Counter (2, 3, 5, or 6) Configuration:

•

Channel Count Format:

Down Counting.

•

Counter Preset V

alue:

Unsigned Integer

, 0 to 65535

prescale value to divide clock pulses

•

Counter Mode:

Divide-by-N.

•

Internal Gate:

Reset Flags, WY19.03, .04, .07, .08.

•

External Gate:

Use the RESET or INHIBIT signal.

24-Bit Counter (1 or 4) Configuration:

• Preset:

Per application.

•

Internal Inhibit:

Reset Flags, WY19.01, .05.

•

Internal Reset:

Reset Flags, WY19.02, .06.

•

Initial Output:

Off.

After programming, the 24-bit counter value is zero. On the first valid clock

pulse, the 16-bit counter is set to the preset value. The clock decrements the

count until the count value reaches 1. During the next clock pulse the

output turns On generating a carry into the 24-bit counter

. The 16-bit

preset is loaded, and counting continues with each clock. The carry is

generated every preset number of clocks. Setting the 16-bit Reset flag

pauses the counting. Clearing the flag reloads the preset value after the

first valid clock.

16-Bit Pr

escale

24-Bit Counting

1 2 ... 98 99 100 101 102 103 104 105 106 107 108 ... 126 127

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