AVG EZTouch I/O Jr., Manual

Page: 36 / 52

EZTouch I/O
Jr.
36 / 52
CPU Memory
Memory Types
The
EZTouch I/O
Jr. system handles many numbers representing different types of
information regarding processes/machine parameters. These processes/machine
parameters may be anything from status of the input or output devices, timers/
counters, or other data values. Before you start programming the
EZTouch I/O
Jr., it
would be helpful if you took a moment to familiarize yourself with how the system
represents and stores the various types of data. Each PLC manufacturer has their
own conventions for this process in their PLCs.
The Mapping Conventions section outlines the specific memory types used in the
EZTouch I/O
Jr. in greater detail. The
EZTouch I/O
Jr. supports the same instructions
as the ones handled by the standard
EZTouch I/O
with a few minor exceptions. Refer
to the Appendix section for the complete set of the available instructions. The
memory types can be used to store a variety of information and can be used within
various RLL instructions. Each memory type falls in one of two general categories:
·
Discrete Memory Type
A discrete memory type is one bit that can be either a 1 or a 0 (On or Off).
Discrete memory area is used for inputs, outputs, control relays, and timer/
counter bits.
· Word Memory Type
A word memory type is a 16-bit location that is normally used to store and
manipulate numeric or ASCII data. A word memory location is also called a
Register.
Since the
EZTouch I/O
Jr. relies on flash memory, the only values saved are the ones
associated with the registers/discretes that are retained during a power cycle. The
specific registers/discretes available on a power cycle are listed in the table below.
The following table also displays all the Register/Discrete types supported by the
EZTouch I/O
Jr. along with their address range, syntax etc.