Rockwell Automation 1769-OF4VI Compact I/O Isolated Analog Modules - Manual (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
Wo
rd
Bit Position
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 S3 S2 S1 S0
1 H3 U3 O3 H2 U2 O2 H1 U1 O1 H0 U0 O0
2 Channel 0 Data Value
3 Channel 1 Data Value
4 Channel 2 Data Value
5 Channel 3 Data Value