Rockwell Automation 1794-APBDPV1 FLEX I/O PROFIBUS Adapter User Manual User Manual
Page 62
Publication 1794-UM064B-EN-P - May 2014
50 Communicate With Your Module
1794-IF4I Isolated Analog Input Module Word/Bit Descriptions
Read Word
Decimal Bit
(Octal Bit)
Definition
Read Word 0
Bit 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.
Read Word 1
Bit 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.
Read Word 2
Bit 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.
Read Word 3
Bit 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.
Read Word 4
Bit 00
Reserved.
Bit 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 be 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 calibration mode is
selected (bit 15, word 5 in the block transfer write set to 1). When this bit is set (1),
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 (1), the module status
indicator flashes.
Read 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, and so on.
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
(13…17)
Set to 0.