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support.automation.siemens.com | Technical Forum | Wednesday, September 10, 2025 8:28:02 PM

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Logo 24RC 0BA6 - backlight activation

Created by: Kando at: 1/23/2015 9:13 PM (4 Replies)

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1/23/2015 9:13 PM	Rate (0)
Kando Posts: 10 Rating: (0)	Hello All, I can't understand why my Logo display backlight does not activate when expected. It''s a 24RC base module (relay output). No TD, I don't have it. I use C3 cursor key to startup a time OFF delay to activate M25 marker for 20 seconds. The simulator works just fine but not the module itself. The light stays off. It turns on when powering the device then switch off when running the program and I cannot see why, please help me understanding where I'm loosing comprehension.. Cheers
Kando Posts: 10 Rating: (0)	Last edited by: Kando at: 1/23/2015 9:14 PM
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1/23/2015 9:18 PM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/10/2025 Posts: 35947 Rating: (4500)	If you use the backlight flag in the program, theback lightdon't automatically turn on when a key is pressed.

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1/23/2015 9:29 PM	Rate (0)
Kando Posts: 10 Rating: (0)	Thanks Man, is there any way I can interact with the backlight when the unit is in run mode without adding an input pushbutton? I just want to have it on when I press any of the 6 buttons, or maybe while pressing 2 of them together.. There is no ambient light where it will be installed.. Thanks
Kando Posts: 10 Rating: (0)
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1/23/2015 9:35 PM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/10/2025 Posts: 35947 Rating: (4500)	I do not know the background, why you are using the flag. If you use a cursor key in the program, you must press ESC + yes cursor button to make a reaction takes place in the program. Place all cursor keys in the program to the flag. Or a pulse encoder, 10s light on, light off 10s.

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1/23/2015 9:42 PM	Rate (0)
Kando Posts: 10 Rating: (0)	Thank man, problem solved :-) Esc + Crusor key is perfect, I didn't know ESC was necessary..
Kando Posts: 10 Rating: (0)
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