I am using a LOGO! 24RCE with Soft Comfort 8.4.1. I am using the LCD display to indicate the status of the circuit - it's either DEPLOYING, or DEPLOYED.

As shown in the attached LD, I have a Momentary SW and a Limit SW that energize a motor coil when the Mom is Closed, and the Limit is Open. When the motor is running, the LCD should display "LEFT DEPLOYING". When Limit I2 Closes, the LCD should display "LEFT DEPLOYED". The LD does work, but it depends on the Priority of the Messages to determine which to display. I am thinking there's probably a better way to determine which message to display - maybe a conditional, or something? I am new to LD programming, so I don't yet know what all is possible.

Any advise on improving my design would be much appreciated!

Thanks,
Bob

Hello.

I would suggest strongly encourage you to use FBD instead of LAD. The LAD implementation is needlessly hard to do. For one thing.. The message block needs to be terminated to some output / flag or "open connector". It is not so clear to notice in LAD. In contrast review the FBD sample in the below picture. Note the encircled blocks.

See the notes by the expert about the priority numbering. It is totally okay to have more than one message active at any one time. It is possible to navigate through the messages by using the up and down keys.

Note also that if a new message is activated, the message navigation is cancelled. The highest priority message is then activated. In application I would use lower than 100 priority for settings and above 100 priority messages for alarms / notifications.

I encourage you to replicate the sample I am sharing as an attached image. Simulate the circuit. Switch I1, I2 and I3 randomly and see the resulting messages.

Caution: the attached image does not contain open connector blocks. It is not required for simulation but is essential for loading to the LOGO! device. Use the F2 keyboard button to see the compile messages.

Enjoy your LOGO!