NAiS GT Series - GT30 Basic Communication Area Map

3-8
3.2.5 GT30 Basic Communication Area Map
In order for communication to be carried out between the GT30 and PLC, an internal device area like
that shown below is provided in the PLC. This should be used to control the GT main unit through the
PLC ladder program actually being run.
The starting address “N” of the field shown below is specified in the GT configuration settings of GTWIN
screen creation tool, and is then sent to the GT main unit.
Word devices
Word position F E D C B A 9 8 7 6 5 4 3 2 1 0
N+0 Screen No. specified by PLC (area read by GT30 from PLC)
N+1 Usage prohibited
N+2 No. of currently displayed screen (area in which data is written from GT30 to PLC)
Explanation of system area
Screen No. specified by PLC:
No. of currently displayed screen:
The screen number specified on the GT30 is specified from the PLC
in hexadecimal format.
The number of the screen currently displayed on the GT30 is written
to the PLC in hexadecimal format.
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
Back-
light
valid
flag
Back-
light
Flashing
Back-
light
Color
N+1 Usage prohibited
N+2
BAT
LOW
flag
B
A
T
Data
Input in
Progress
flag
Explanation of system area
BZ:
Forced-display flag:
Backlight Valid flag:
Backlight Flashing
Backlight Color:
Data Input In Progress flag:
BAT:
BAT LOW flag:
This turns on the buzzer.
At the rise when the bit is turned on, the screen specifed by the PLC is
forcibly displayed. (This is executed only when at the rise of the bit.)
When the bit is turned on, the backlight flashing/backlight color control
becomes effective.
0: Lighted (normal), 1: Flashing
00: Off, 01: Lighted, 10: Lighted, 11: Lighted
This is 1 while data is being input, and 0 whendata input has been
completed.
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.)
This goes on when the battery is running low. Please replace the battery
with a new one within a week after this bit went on.