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It sounds like you need Schedule:File objects. These refer to a CSV file and column number which contains your input variables.
In the situation you describe though, I think you may also need to use EMS, since I'm not sure mass flow rate can be controlled by schedule directly (though there is a Pump Flow Rate Schedule Name field for the ZoneHVAC:LowTemperatureRadiant:ConstantFlow object).
It sounds like you need Schedule:File Look at Schedule:File objects. These refer I'm on my mobile right now but will give a more complete answer when I get to a CSV file and column number which contains your input variables.my desk (unless someone gets there first).
In the situation you describe though, I think you may also need to use EMS, since I'm not sure mass flow rate can be controlled by schedule directly (though there is a Pump Flow Rate Schedule Name field for the ZoneHVAC:LowTemperatureRadiant:ConstantFlow object).