0BA8: 64 digital flags M1 to M64; 64 analog flags AM1 to AM64 0BA7: 27 digital flags M1 to M27; 16 analog flags AM1 to AM16 0BA6: 27 digital flags M1 to M27; six analog flags AM1 to AM6 0BA4, 0BA5: 24 digital flags M1to M24; six analog flags AM1 to AM6 0BA3, 0BA2: eight digital flags M1 to M8 0BA1: four digital flags M1 to M4 0BA0: zero flag

In your block configuration, you can assign a new number to the flag, provided this flag number does not already exist in your circuit program.

The output always carries the signal of the previous program cycle. This value does not change within the current program cycle.

The following special flags have different background colors:

• M8 (displays blue in LOGO!Soft Comfort) = Initialization Flag

• M25 (display white in LOGO!Soft Comfort)

  • 0BA8 and earlier versions: LOGO! displays white backlight

• M26 (display white in LOGO!Soft Comfort)

  • 0BA8 and earlier versions: LOGO! TD display white backlight

• M27 (displays green in LOGO!Soft Comfort)

  • LOGO! 9 and later versions: Message Page Flag

  • 0BA8 and earlier versions: Message Character Set Flag

• M28 (displays amber in LOGO!Soft Comfort)

  • LOGO! 9 and later versions: LOGO! displays amber backlight on the status bar

  • 0BA8 and earlier versions: LOGO! displays amber backlight

• M29 (displays red in LOGO!Soft Comfort)

  • LOGO! 9 and later versions: LOGO! displays red backlight on the status bar

  • 0BA8 and earlier versions: LOGO! displays red backlight

• M30 (displays amber in LOGO!Soft Comfort)

  • LOGO! 9 and later versions: LOGO! TDE displays amber backlight on the status bar

  • 0BA8 and earlier versions: LOGO! TDE displays amber backlight

• M31 (displays red in LOGO!Soft Comfort)

  • LOGO! 9 and later versions: LOGO! TDE displays red backlight on the status bar

  • 0BA8 and earlier versions: LOGO! TDE displays red backlight

Besides, flag blocks which are configured as email sending trigger event display green backlight.

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

For LOGO! 0BA8 and earlier versions, Flags M25, M28 and M29 control the backlight of the LOGO! onboard display. Flags M26, M30 and M31 control the backlight of the LOGO!燭DE.

For LOGO! 9 and later versions, Flags M28 and M29 control the backlight of the LOGO! screen status bar. Flags M30 and M31 control the backlight of the LOGO!燭DE screen status bar.

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 page flag: M27 (LOGO! 9 and later versions)

In the circuit program, you can use M27 to determine to display Message Page 1 or Message page 2.

When M27=0 (low), then LOGO! only displays message page 1; when M27=1 (high), then LOGO! only displays message page 2.

To make M27 flag control the message page display, you need to select "User M27 to change the message page" in the Message text settings. Refer to File -> Message text Settings (LOGO! 9 and later versions) for detailed information.

Message text character set flag: M27 (0BA8 and previous versions)

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 menu command of LOGO!Soft Comfort. Then when you configure message texts , 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 AM128

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.

Float analog flags: FAM1 to FAM32

The float analog flags can be used as markers for float analog inputs or float analog instruction blocks. The float analog flag merely accepts a float analog value as input and outputs that value.