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Notes:The enable line (EN) should be held high until the ST variable is set to 2, indicating the blocktransfer request has been accepted by the KTx scanner card and is in progress. All requests areaccepted at the end of the scan unless the KTx queue is full. The KTx can queue up to 64 blocktransfer requests (only 1 request per ASB adapter).If LEN is not defined or set to 0, the entire data buffer is transmitted.
If OFF is not defined or set to 0, the block transfer starts at the beginning of the transfer buffer. Anoffset might be required for certain modules, such as the PID module, but in most cases are safelyset to 0.When the block transfer has completed, the ST variable is set to 3 and DN or ER is set indicating ifthe transfer was successful or an error occurred. When the next transfer is initiated, DN and ER areautomatically cleared. If EN is held high then another request is immediately queued on completionof the last.
When power is applied to an OUT instruction the parameter turns ON(1). When no power is applied, the parameter is OFF(0). Because OUT is an output instruction, it should appear at the end of a rung. Variations When the assigned parameter is specified as retentive the following alternate symbol is displayed in the logic. Parameter Data Types The parameter is a BOOL data type. By default, the BOOL variable automatically created when inserting an OUT instruction will be non-retentive (set to its initial state when the Controller starts following a shutdown or reset).
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