Push to on push to off 1

https://www.plctutorialpoint.com/2012/04/push-to-on-push-to-off-plc-program.html

Push to on push to off 2

https://mayurhaldankar.wordpress.com/plc-ladder-logic-programs/single-push-button-onoff-ladder-logic/

Heater timer

Saw

https://instrumentationtools.com/plc-programming-examples/

Holding/Latch Circuit