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Figure 85: Reading Via Multiple MSG Instructions
13.2.9 ControlLogix Example: Reading and Writing
Often times, applications may need to both read data from and write data to the drive. At a minimum, this will require two MSG instructions and two message controller tags. Figure 86 shows an example of two MSG instructions, one for reading and one for writing. The only item of note that differentiates this example from the
Figure 87 shows the configuration details of the example wr_connection MSG instruction. Note that the chosen “Message Type” is “CIP Data Table Write”, and that this instruction will only be writing to one drive register: namely, the frequency command (Destination Element is wr_reg_1008). The Source Element in this case is the 8th element (starting from index 0) of an INT array tag named “wr_data_array”.
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