Z-World XP8900 Instrukcja Użytkownika Pobierz pdf (Strona 34)

PK2100

4-2 s System Development

Gate programming is not C programming. It is done with an

application program, written in C, that modifies the param-

eters of the virtual driver.

Programming

Z-world supports program development for the PK2100 in a variety of

ways. Support for some of these stems from a virtual driver, which

monitors the PK2100s ports and provides a set of virtual latches,

timers, counters, function keys and two DAC analog outputs.

Gate Programming

Gate programming is a quick and easy way to program the PK2100s

inputs and outputs. The logic elements are summarized in Table 4-1.

Table 4-1. Gate Programming Logic Elements

External Internal

Seven digital inputs Thirty memory latches

Six universal inputs Ten on-delay timers

Ten digital outputs Five countdown counters

Four special function keysTwo relay outputs

Discrete digital-to-analog outputs

An operator updates the parameters supported by these logic elements

using the five-key system. Gate programs can be downloaded or uploaded

serially through the RS-232 connection to a PC.

Support functions for gate programming may be found in the subdirectory

LIBRARY\GATE_P.LIB. The programs SCAN.C and GATER.C in

SAMPLES\CPLC are examples of gate programming.

Costatements

Costatements, formerly called function blocks, implement cooperative

multitasking, and use the virtual driver.

The Real-Time Kernel

The real-time kernel allows a preemptive multitasking system to be

developed.

The Five-Key System

The five-key system implements a user interface to the software using the

PK2100s keypad and liquid crystal display.

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Z-World XP8900 Instrukcja Użytkownika Strona 34