Rockwell Automation 1794-IF4I, -OF4I, IF2XOF2I, -IF4IXT, -IF4ICFXT, -OF4IXT, IF2XOF2IXT FLEX I/O Isolated Analog Modules User Manual
Page 65
Publication 1794-6.5.8 - January 2010
Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter 65
Table 4.10
Bit/Word Descriptions for the 1794-OF4I Analog Output Module Read
Read Word
Decimal Bit
(Octal Bit)
Definition
Word 0
Bits 00-15 (00-17) Read Back Channel 0 – During normal operation, it is a copy of the output of channel
0. During an EN transition, it is the condition of the output as determined by S1 and S0.
Read back is an image of what the user has sent as output to the module; no checks are
performed on the data.
Word 1
Bits 00-15 (00-17) Read Back Channel 1 – During normal operation, it is a copy of the output of channel
1. During an EN transition, it is the condition of the output as determined by S1 and S0.
Read back is an image of what the user has sent as output to the module; no checks are
performed on the data.
Word 2
Bits 00-15 (00-17) Read Back Channel 2 – During normal operation, it is a copy of the output of channel
2. During an EN transition, it is the condition of the output as determined by S1 and S0.
Read back is an image of what the user has sent as output to the module; no checks are
performed on the data.
Word 3
Bits 00-15 (00-17) Read Back Channel 3 – During normal operation, it is a copy of the output of channel
3. During an EN transition, it is the condition of the output as determined by S1 and S0.
Read back is an image of what the user has sent as output to the module; no checks are
performed on the data.
Word 4
Bits 00
Reserved
Bits 01
Calibration Done bit (DN). – This bit is set to 1 after a calibration cycle is completed.
Bit 02
Calibration Bad bit (BD). – This bit is set to 1 if the channel calibration coefficients
cannot be saved or read properly.
Bits 03–07
Set to 0.
Bits 08–11
(10-12)
Reserved
Bit 12 (14)
Set to 0
Bit 13 (15)
Configuration mode bit (CF) – This bit is set (1) when the configuration mode is
selected (bit 15, word 5 in the block transfer write set to 1). When this bit is set, the
module status indicator flashes.
Bit 14 (16)
Field Power Off bit (FP) – This bit is set (1) when the 24V field power fails. When this
bit is set (1), the module status indicator flashes.
Bit 15 (17)
Power Up (unconfigured state) bit (PU). – This bit is set (1) when the configuration
word is all zeroes (0) due to a reset (adapter power cycle or module insertion) or a cleared
configuration word (all 0). When this bit is set, the module status indicator flashes.
Word 5
Bits 00–03
Wire-Off status bits. (W). – These bits, when set (1), indicate the corresponding
current output channel is open. W0 corresponds to channel 0, W1 corresponds to
channel 2, etc.
Bits 04–07
Set to 0.
Bits 10–11
(12-13)
Hold output bits (P). – These bits are set (1) in response to Q0 or Q1 and a transition of
the EN bit. When P0 or P1 is set (1), they indicate that the output is holding at the level in
the readback data for the respective channel. These bits return to 0 when the output data
matches the readback output data.
Bits 12–15
(14-17)
Set to 0.