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Hello! I understand this is a retentive timer, which is what I want because I do not want the timer to stop timing when S goes false (0) unless R goes true (1). I only want the timer to stop timing when R goes true (1). I don't care if the timer stops timing when S goes true after going false because it'll never happen in my current configuration.

Question: After a restart, if S is false (0), will the timer require S to go to true (1) again prior to initiating the timer (repeating the cycle)?

Thanks in advance for the clarification.

STEP7 Online manual

Description

S_ODTS (Retentive On-Delay S5 Timer) starts the specified timer if there is a positive edge at the start (S) input. A signal change is always necessary in order to enable a timer. The timer runs for the time interval specified at input TV even if the signal state at input S changes to "0" before the time interval has elapsed. The signal state at output Q is "1" when the timer has elapsed without regard to the signal state at input S. The timer will be restarted (re-triggered) with the specified time if the signal state at input S changes from "0" to "1" while the timer is running.

The timer is reset if the reset (R) input changes from "0" to "1" without regard to the RLO at the S input. The signal state at output Q is then "0".

The current time value can be scanned at the outputs BI and BCD. The time value at BI is binary coded, at BCD it is BCD coded. The current time value is the initial TV value minus the time elapsed since the timer was started.