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Regarding the Periodic Control option in RUT955 Legacy firmware. The said option is not included in the RUTOS 7.0 Firmware as a substitute for this you can use the Scheduler feature. Also, you can try playing with the I/O Juggler in implementing your Rules.
You can refer to this link for more information: RUT955 Input/Output - Teltonika Networks Wiki (teltonika-networks.com)
I hope it helps