Rockwell-automation 1769-OF4VI Compact I/O Isolated Analog Modules User Manual download pdf (Page 56)

Publication 1769-UM014B-EN-P - May 2010

4-4 Module Data, Status, and Channel Configuration for the Output Modules

1769-OF4CI and -OF4VI

Input Data File

This data table file provides immediate access to channel diagnostic

information and analog output data at the module for use in the control

program. To receive valid data, you must enable the channel. The data table

structure is described below.

1769-OF4CI and -OF4VI Data Values

Words 2 to 5 contain the data echo of the analog data presently commanded by

the module for each output.

1769-OF4CI and -OF4VI General Status Bits (S0 to S3)

Word 0, bits 0 to 3 contain the general status information for output channels

0 to 3. If set (1), these bits indicate an error associated with that channel. The

over-range and under-range bits are logically ORed to this position.

1769-OF4CI and -OF4VI Over-Range Flag Bits (O0 to O3)

Word 1, bits 0, 4, 8, and 12 contain the over-range bits for channels 0 to 3.

When set, the over-range bit indicates that the controller is attempting to drive

the analog output above its normal operating range or above the channel’s

High Clamp level (if clamp limits are set for the channel). However, the

module continues to convert analog output data to a maximum full range value

if clamp levels are not set for the channel.

If alarm latching is not enabled for the channel, the bit is automatically reset

(0) by the module when the over-range condition is cleared or the commanded

value no longer exceeds the high clamp (the output is commanded to return to

within the normal allowed range). The over-range bits apply to all output

ranges.

Refer to 1769-OF4CI Valid Output Data Table on page 4-17 and 1769-OF4VI

Valid Output Data Table on page 4-18 to view the normal operating and

over-range areas.

Table 4.3 1769-OF4CI and -OF4VI Input Data Table

Word

Bit Position

1514131211109876543210

0 S3S2S1S0

1 H3U3O3 H2U2O2 H1U1O1 H0U0O0

2 Channel 0 Data Value

3 Channel 1 Data Value

4 Channel 2 Data Value

5 Channel 3 Data Value

1 2 ... 51 52 53 54 55 56 57 58 59 60 61 ... 127 128

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Rockwell-automation 1769-OF4VI Compact I/O Isolated Analog Modules User Manual Page 56