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Fail to read timer value


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I'm trying to read a timer value from a V350 device and fail.


When I run this code I have no problem to read the MI101 value:

           rw[0] = new ReadOperands()
                    OperandType = OperandTypes.MI,
                    NumberOfOperands = 1,
                    StartAddress = 101

but if I try to read the TD1 value with  this code I get an InvalidCastException:

           rw[0] = new ReadOperands()
                    OperandType = OperandTypes.TimerCurrent,
                    NumberOfOperands = 1,
                    StartAddress = 1

How can I do it without getting the exception, if at all?



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