Siemens LOGO! Series Manual page 233

Programming Global Message Text Parameters
Message Text Function Block
Symbol in LOGO!
LOGO!
Manual, 04/2011, A5E03556174-01
Wiring Description
Input En A 0 to 1 transition at input En (Enable) starts the
output of the message text.
Input P P: Priority of the message text
Range of values: 0...127
Message destination
Message tick settings
Ack: Acknowledgment of the message text
LOGO! functions
4.4 Special functions list - SF
233