The program is a little difficult to understand in the 120/130/140 area but otherwise things look fine. I would suggest breaking line 120 into separate lines.
120 IF+ INTERVAL( 0:01:00) AND SS THEN START MINUTE
130 IF+ MINUTE THEN BT = BT + 1
140 IF+ MINUTE THEN DAY_TIME = DAY_TIME + 1
150 IF+ MINUTE THEN RT_ONCE = RT_ONCE + 1
151 IF TIME-ON( MINUTE ) > 0:0:2 THEN STOP MINUTE
You can use IF+ MINUTE many times in the same program, each line keeps track of the state of MINUTE and events with it separate from the others.