NAiS GT01, Technical Manual

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How the Various Functions Are Used
GT series
67
6.2 Basic Communication Area to PLC and Bit Device Functions (GT01)
6.2 Basic Communication Area to PLC and Bit Device
Functions (GT01)
6.2.1 Bit Device Functions
In order for communication to be carried out between the GT01 and PLC, an internal
device area like that shown below is provided in the PLC. This basic communication
area contains two types of devices: word devices, which are used to handle screen
numbers and other data, and bit devices, which are used for bit information. The various
bits of the bit devices are turned on and off from the PLC, and can be used to control
various GT01 operations.
Bit devices
Word position F E D C B A 9 8 7 6 5 4 3 2 1 0
N+0
BZ Forced-
display
flag
Backlight
Valid flag
Backlight
Flashing
Backlight
Color
N+1 Usage prohibited
N+2
Data Input
In Prog-
ress flag
Explanation of system areas
BZ - - - This turns on the buzzer.
Forced-Display flag - - - At the rise when the bit is turned on, the screen specified by
the PLC is forcibly displayed. (This is executed only when at the rise of the bit.)
Backlight Valid flag - - - When the bit is turned on, the backlight flashing/backlight
color control becomes effective.
Backlight Flashing - - - 0: Lighted (normal), 1: Flashing
Backlight Color - - - 00: Off, 01: Green, 10: Red, 11: Orange
Data Input In Progress flag - - - This is 1 while data is being input, and 0 when data
input has been completed.
Explanation of this function
DT0 to DT2 and WR0 to WR2 are set as the default values for the basic
communication area.
For information on the contents of all areas of the basic communication
area, please see page 26.