Rockwell Automation Allen-Bradley 1769-IF4, Руководство пользователя

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Publication 1769-UM002B-EN-P - July 2005
Module Data, Status, and Channel Configuration for the Output Modules 4-3
1769-OF2 Over-Range Flag Bits (O0 and O1)
Over-range bits for channels 0 and 1 are contained in word 1, bits 14 and 12.
When set, the over-range bit indicates that the controller is attempting to drive
the analog output above its normal operating range. However, the module
continues to convert analog output data to a maximum full range value. The
bit is automatically reset (0) by the module when the over-range condition is
cleared (the output is within the normal operating range). The over-range bits
apply to all output ranges. Refer to Table 4.5 1769-OF2 Valid Output Data
Table on page 4-12 to view the normal operating and over-range areas.
1769-OF2 Under-Range Flag Bits (U0 and U1)
Under-range bits for channels 0 and 1 are contained in word 1, bits 15 and 13.
When set (1), the under-range bit indicates that the controller is attempting to
drive the analog output below its normal operating range. However, the
module continues to convert analog output data to a minimum full range
value. The bit is automatically reset (0) by the module when the under-range
condition is cleared (the output is within the normal operating range). The
under-range bits apply to all output ranges. Refer to Table 4.5 1769-OF2 Valid
Output Data Table on page 4-12 to view the normal operating and
under-range areas.
1769-OF2 General Status Bits (S0 and S1)
Word 0, bits 0 and 1 contain the general status information for output
channels 0 and 1. If set (1), these bits indicate an error associated with that
channel. The over-range and under-range bits and the diagnostic bit are
logically ORed to this position.