Rockwell-automation 57C435 Processor Module, AutoMax Manual do Utilizador descarregar pdf (Página 24)

4Ć4

1514131211109876543210

0D00

hex number

OPTIONAL TERMINATION

CHARACTERS FOR INPUT

STATEMENTS

1: XĆON, XĆOFF HANDSHAKE

ENABLED (D)

1: HARD COPY DEVICE

0: NON HARD COPY DEVICE (D)

1: ECHO ON (D)

0: ECHO OFF

0: 7ĆBIT CHARACTERS

1: 8ĆBIT CHARACTERS (D)

0: ODD PARITY (D)

1: EVEN PARITY

0: PARITY DISABLED (D)

1: PARITY ENABLED

0: 1 STOP BIT (D)

1: 2 STOP BITS

0: HARDWARE HANDSHAKING

DISABLED (D)

1: HARDWARE HANDSHAKING

ENABLED

0D00 = Default Setting

Figure 4.1 Ć Specifying the SETUP Parameter in an OPEN Statement

4.3 Programmable Tick Rate

Control Block, BASIC, and PC tasks can be executed at a fixed scan

rate. The scan rate for a Control Block task is set using the

SCAN_LOOP function; the scan rate for a BASIC task is set using the

START EVERY statement; the scan rate for a PC task is set in the

editor. (In addition, a BASIC task can be delayed by using the DELAY

statement.) All of these scan rates can be specified in terms of ticks.

The programmable tick rate" allows you to change the definition of

the tick. By changing the tick, the time base for tasks is changed.

This change allows you to run a task at a scan rate other than the

default of 5.5 msec. It also allows you to execute application tasks at

more easily understood scan times (5.0 msec or 10.0 msec.).

The tick rate is set using the Rack Configurator in the AutoMax

Programming Executive Version 3.1 or later. It is not available when

using previous versions of the Programming Executive. The tick rate

can be set when a Processor module is added or modified. The

programmable tick rate can be set in increments of 0.5 msec.

between 0.5 msec and 10.0 msec. For compatibility, the default tick

rate is 5.5 msec. The tick rate is defined separately for each

Processor in a rack.

The tick rate is transferred when the configuration object code is

transferred to the Processor. The tick rate is set on the Processor

immediately when the configuration is loaded.

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