GT10/GT30

7.2 GT10 Bit Device Functions

 

 

7.2GT10 Bit Device Functions

In order for communication to be carried out between the GT10 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 GT10 operations.

Bit devices

Word position

F

E

 

D

C

B

A

9

8

7

6

5

4

3

2

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BZ

Forced–

 

Backlight

Backlight

Backlight

 

 

 

 

 

 

 

 

 

 

N+0

 

display

 

Valid flag

Flashing

Color

 

 

 

 

 

 

 

 

 

 

 

 

 

flag

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

N+1

Usage prohibited

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BAT

Data Input

N+2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

BAT ––– This goes on if clock data and Hold PLC Device data held in the SRAM are not being backed up normally. (This bit also goes on if the SRAM is not backed up by the internal secondary battery.)

Data Input In Progress flag ––– This is 1 while data is being input, and 0 when data input has been completed.

EXPLANATION

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 30.

Changing the backlight color

Bits A and B of the first word of the bit device are used to change the backlight color. The color of the backlight can be changed by turning these bits on and off.

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