① PLS Pulse rise time differential output directive, PLF is a pulse differential output decline. PLS and PLF command can only be used for the output relay y and auxiliary relay m (does not include special auxiliary relays).
② M0 X0 normally open from open to close (X0 rising edge) when a scan cycle for ON;M1 only on X1 normally open contact connected become disconnected (X1 the falling edge) ON when a scan cycle.
③ in the case of input relay X0 through, PLC by downtime → run time, PLS M0 instruction will output a pulse. However, if you use the battery backup (latches) the auxiliary relays instead of M0, PLS order in this case no output pulses.