MVI56-MCMR Supporting Float Point Data
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bofwanker1
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Wednesday 14 March 2007 8:48:52 am |
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MVI56-MCMR Supporting Float Point Data
I would like to get some information on send Floating Point Data using the MVI56-MCMR. Including the support for the ladder module for sending and receiving of the data.
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jsanders
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Friday 30 March 2007 3:32:16 pm |
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RE:MVI56-MCMR Supporting Float Point Data
To send Floating Point (REAL) data from a CLX CPU to the ProSoft MVI56-MCMR module, simply use the COPy instruction in RSLogix to COPy from any REAL-type tags or Tag Arrays to the MCM1.WriteData[x] array. The LENgth of the COPy instruction will need to be twice the number of FP values you wish to send, as each 32-bit FP will be stored in two 16-bit registers in the MCMR.
To read in FP data, simply COPy from the MCM1.ReadData[x] array into a REAL-type tag or tag array. The LENgth of this COPy instruction will be the number of REAL values you want to create. Keep in mind, it will take 2 16-bit array elements to hold one FP value; so there will be twice as many elements used in the ReadData[x] array as there are FP values.
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