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Reference material
5.1 Constants and connectors
LOGO!Soft Comfort Online Help
222 Operating Instructions, 11/2017
Startup flag: M8
The M8 flag is set in the first cycle of the user program and can thus be used in your circuit
program as a startup flag. It is reset after the first program execution cycle.
In the subsequent cycles, the M8 flag reacts in the same way as the M1 to M64 flags.
Backlight flags
Flags M25, M28 and M29 control the backlight of the LOGO! onboard display. Flags M26,
M30 and M31 control the backlight of the LOGO! TDE.
You can use the outputs of timers, message texts, or other function blocks to activate the
backlight flags. To enable multiple conditions to control the backlight of the devices, you can
use multiple function blocks in parallel or in sequence.
Message text character set flag: M27
The M27 flag, if used, determines whether the message texts of the primary character set or
the secondary character set will display. You select the two character sets from either
LOGO! or the File → Message Text Settings (Page 54) menu command of LOGO!Soft
Comfort. Then when you configure message texts (Page 341) , you select whether a
particular message text consists of characters from the primary character set (Character Set
1) or the secondary character set (Character Set 2).
In the circuit program, you can use M27 to enable the message texts of either the primary or
secondary character set and to disable the message texts of the other. When M27=0 (low),
then LOGO! only displays the message texts from the primary character set; when M27=1
(high), then LOGO! only displays the message texts from the secondary character set.
Analog flags: AM1 to AM64
The analog flags can be used as markers for analog inputs or analog instruction blocks. The
analog flag merely accepts an analog value as input and outputs that value.
Overview (Page 217)
M8, M25, M26, M27, M28, M29, M30 and M31 are not a
vailable in the UDF Editor.
5.1.1.9
Analog inputs
The LOGO! 12/24RC, LOGO! 12/24RCo, LOGO! 24, LOGO! 24o, LOGO! 24C, LOGO! 24Co
and LOGO! 12/24RCE, as well as the expansion modules LOGO! AM2 12/24 process
analog signals. You can use up to eight analog inputs. In your block configuration, you can
assign a new input terminal to an input block, provided this terminal is not already used in
the circuit program.
222


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