User Manual

PAGE 16 15 MAR 2003 CH.1
MAN305-04
e. Text Tables
A Text Table is a list of Text Items, which can be used in a Data Field, to display descriptive words and
phrases to describe the value of a Register, instead of displaying numeric values. A simple example of
this, would allow the strings “OFF” and “ON” to be displayed, instead of 0 and 1, to describe the state of
the %I4 digital input. The maximum number of Text Tables and Text Items per Text Table is shown in
Table 1, but the number can be further limited by overall User Screen memory usage.
Physical I/O Registers
Physical I/O Registers (%I, %Q, %AI and %AQ) give the user access to the Physical I/O Module
data. This data can be accessed via User Screens and/or by Ladder Code.
a. %I Registers
A %I Register is a 1-bit memory location, which is normally used to store the state of one of the digital
inputs associated with a Physical I/O module. When used in this way, %I registers are non-retentive. All
extra %I registers, which are not associated with physical inputs, are retentive, and can be used just like
%M registers.
b. %Q Registers
A %Q Register is a non-retentive 1-bit memory location, which is normally used to store the state of one
of the digital outputs associated with a Physical I/O module.
c. %AI Registers
A %AI Register is a 16-bit memory location, which is normally used to store the value of one of analog
inputs associated with a Physical I/O module. When used in this way, %AI registers are non-retentive.
All extra %AI registers, which are not associated with physical inputs, are retentive, and can be used just
like %R registers.
d. %AQ Registers
A %AQ Register is a non-retentive 16-bit memory location, which is normally used to store the value of
one of the analog outputs associated with a Physical I/O module.
Global Data I/O Registers
Global Data I/O Registers (%IG, %QG, %AIG and %AQG) give the user access to the Network Port’s
Global I/O data. This data can be accessed via User Screens and/or by Ladder Code.
a. %IG Registers
A %IG Register is a retentive 1-bit memory location, which is normally used to store a global digital state
obtained from another Control Station on the network.
b. %QG Registers
A %QG Register is a retentive 1-bit memory location, which is normally used to store a digital state to be
sent as global data to the other Control Stations on the network.