Panasonic GTWIN, Reference Manual

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293
Glossary of terms
Base screen
A base screen is the standard screen you design with GTWIN. Keyboard screens are the
other kind of screen you design with GTWIN. After you transfer these screens, they can be
displayed on the GT unit. The base screen number corresponds to the screen number on the
GT unit.
Basic communication area to PLC (Controller)
The basic communication area (see p. 24) allows the PLC and GT unit to exchange basic
data and for the PLC to control basic functions in the GT unit. Therefore, the PLC must not
use these addresses for other purposes!
You must specify a basic communication area.
Bit device
A bit device represents 1-bit information, e.g. TRUE or FALSE. It can be an internal flag, e.g.
R, L, GR, or I/O information, e.g. X or Y. (Other vendors may use different nomenclature for
bit devices.)
Control device
A control device species a WORD area (16 bits) for controlling or monitoring 16 relays (WX,
WY, WR, WL, WGR).
Device, Reference Device
A "device" or "reference device" refers either to a bit device (see p. 293) or word device (see
p. 293).
Index device
An index device (see p. 56) is used in combination with a reference device to yield a new
device from which values are read by data parts.
Keyboard screen
Keyboard screens are designed to be used together with data parts for entering data. They
are administered separately from base screens.
Start device
The start device is the beginning address of a word device (see p. 293) in a contiguous
memory area.
Word device
A word device represents 16-bit information, e.g.a relay (WX, WR, etc.), timer or counter
(SV, EV), PLC register (DT, LD, FL) or GT internal relay or register (e.g. WGR, GDT). (Other
vendors may use different nomenclature for word devices.)