Rockwell-automation 1769-IF4XOF2 Compact 8-Bit Low Resolution Analog I Manuel d'utilisateur Page 51

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Publication 1769-UM008A-EN-P - November 2001
1769-IF4XOF2 Module Data, Status, and Configuration Channels 4-7
Output Data File
The output file contains the module’s analog output data information.
Word 0 and 1, bits 7 through 14 contain the output data bits for
channels 0 and 1.
The output data file applies only to output data from the module as
shown in the table below.
Output Data Words 0 and 1
The SGN bit of Words 0 and 1 is always zero (0). The following table
illustrates the format of the output data.
Table 4.4 Output Data File
Word
Bit Position
1514131211109876543210
0 SGN Analog Output Data Channel 0 0000000
1 SGN Analog Output Data Channel 1 0000000
1514131211109876543210
SGNA7A6A5A4A3A2A1A00000000
IMPORTANT
Bits 0 through 6 and Bit 15 of output data words 0
and 1 should always be set to zero in your control
program. If they are not set to 0, the invalid data flag
(Ex) will be set for that channel. However the
channel will continue to operate with the previously
converted value. If a MVM (Move with Mask)
instruction is used with a mask of 7F80 (hexidecimal)
to move data to the output words, writing to bits 0
through 6 and bit 15 can be avoided.
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