Here is some code with two RFID stations in response to a request from another user. One station Reads the Serial Number and then Writes the Minutes and Seconds to Register 1 and 2 respectively (I skip register 0). The second station Reads the Serial Number and then the data in Registers 1 and 2. The boxes continue to move which limits the number of Registers that can be written to or read from based on the 400ms timing. Timing was chosen to allow some visual observation of the chart although it could be tightened up a bit.
This timing helps demonstrate the importance to proper sequencing and accounting for read/write delays with a real system with no status bits for Operation Successful or Tag Present. Controlio does not scan like a PLC so I delayed the count reset.
Oct 2020 Update:
Please see attached Factory, Compact Logix Program (see zip file) and pdf Printout that allows for some testing of the RFID system using ladder. Operation is similar to the Controlio version with the exception of some extra time allotted to allow the Read Data to transfer from the Simulation to the PLC.