GT10/GT30
Documentation
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10.3 Basic Communication Area Map
10.3.2 GT30 Basic Communication Area Map
Inorder for the GT30 andPLCtocommunicate, an internal device area inthePLCmust
be assured ahead of time, as shown below. This field should not be used in ladder
programs in the PLC actually being operated. Also, the beginning address [N] of the
field below is specified in the GT30 configuration settings of GTWIN, and is then sent
to the GT30.
Word devices
Word position F E D C B A 9 8 7 6 5 4 3 2 1 0
N+0 Screen number specified by PLC (area read by GT30 from PLC)
N+1 Usage prohibited
N+2 Number of screen currently displayed (area written by GT30 to PLC)
Explanation of the system areas
Screen number specified by PLC -- - The number of the screen displayed on the
GT30 is specified from the PLC in hexadecimal format.
Number of screen currently displayed - - - 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
Backlight
Valid flag
Backlight
Flashing
Backlight
Color
N+1 Usage prohibited
N+2
BAT
LOW
flag
BAT
Data Input In
Progress 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: Lighted, 10: Lighted, 11: Lighted
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 battery.)
Data Input In Progress flag - - - This is 1 while data is being input, and 0 when data
input has been completed.
BAT LOW flag - - - Thisbitgoesonifthe battery capacitancedropstoolow.Thebattery
should be replaced within one week of the time when this bit goes on.
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