R

Words starting with R.

• REALA data type for a number with a decimal point, such as a temperature of 21.5.
• RESReset. Clears a timer's or counter's accumulated value and bits back to zero.
• rising edgeThe moment a signal changes from off to on. It lasts one scan.
• routineA named block of ladder logic. A program can split its work into routines and call them from a main routine.
• RTORetentive timer. Like TON, but it keeps its accumulated time when the rung goes false. Only RES clears it.
• rungOne line of ladder logic: conditions on the left and an output on the right. The PLC solves the rungs one at a time, from the top down.