User`s manual
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.
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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 PK2100s 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 PK2100s
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
PK2100s keypad and liquid crystal display.