Are the assignments of inputs and outputs to programs at the resource level fixed or can they change dynamically?
They are fixed. Programs are the highest level IEC 61131-3 programmable organisation unit. It is not possible to have language statements outside of a program. In a resource declaration it is only possible to assign input and output variables to the program interface. If it is necessary to change the inputs used by part of a program, then all inputs concerned should be passed to the program and any dynamic selection of particular inputs should be done within the program body, e.g. to switch between using two different sets of sensors.
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