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Reading and writing to addresses in the device is accomplished by using tags to represent specific data points. For ACM to provide the OPC client with a list of Tags in the device, the driver must first query the device to obtain this tag listing. This process MUST BE INITIATED manually during configuration and prior to any OPC clients activating can read/write tags from an HMI or similar.
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The driver will validate any correct pattern as described above. During the first read attempt after a tag is placed in service, the driver will check the data type entered by the user to see if it matches the reported data type issued in the response. If it does not match, the item will be flagged as Bad in OPC and will not receive a value. The driver will make an entry in the logger indicating the discrepancy. If the data type is correct, then the driver will treat the tag as a Listed tag for the remainder of its activation.
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