
2–45How Communication Takes Place and I/O Image Table Mapping
1 )'!0',+ 6 ,2#* #.
Word/Bit Descriptions for the 1794-OF4I Isolated Analog
Output Module
Read Words
Decimal Bit
(Octal Bit)
Definition
,."
'0/
Read Back Channel 0 1.'+% +,.*) ,-#.0',+ '0 '/ !,-4 ,$ 0&# ,10-10 ,$
!&++#) 1.'+% + 0.+/'0',+ '0 '/ 0&# !,+"'0',+ ,$ 0&# ,10-10 /
"#0#.*'+#" 4 +" #" !( '/ + '*%# ,$ 3&0 0&# 1/#. &/ /#+0
/ ,10-10 0, 0&# *,"1)# +, !&#!(/ .# -#.$,.*#" ,+ 0&# "0
,."
'0/
Read Back Channel 1 1.'+% +,.*) ,-#.0',+ '0 '/ !,-4 ,$ 0&# ,10-10 ,$
!&++#) 1.'+% + 0.+/'0',+ '0 '/ 0&# !,+"'0',+ ,$ 0&# ,10-10 /
"#0#.*'+#" 4 +" #" !( '/ + '*%# ,$ 3&0 0&# 1/#. &/ /#+0
/ ,10-10 0, 0&# *,"1)# +, !&#!(/ .# -#.$,.*#" ,+ 0&# "0
,."
'0/
Read Back Channel 2 1.'+% +,.*) ,-#.0',+ '0 '/ !,-4 ,$ 0&# ,10-10 ,$
!&++#) 1.'+% + 0.+/'0',+ '0 '/ 0&# !,+"'0',+ ,$ 0&# ,10-10 /
"#0#.*'+#" 4 +" #" !( '/ + '*%# ,$ 3&0 0&# 1/#. &/ /#+0
/ ,10-10 0, 0&# *,"1)# +, !&#!(/ .# -#.$,.*#" ,+ 0&# "0
,."
'0/
Read Back Channel 3 1.'+% +,.*) ,-#.0',+ '0 '/ !,-4 ,$ 0&# ,10-10 ,$
!&++#) 1.'+% + 0.+/'0',+ '0 '/ 0&# !,+"'0',+ ,$ 0&# ,10-10 /
"#0#.*'+#" 4 +" #" !( '/ + '*%# ,$ 3&0 0&# 1/#. &/ /#+0
/ ,10-10 0, 0&# *,"1)# +, !&#!(/ .# -#.$,.*#" ,+ 0&# "0
'0/ #/#.2#"
'0/
Calibration Done bit (DN). &'/ '0 '/ /#0 0, $0#. !)' .0',+ !4!)# '/
!,*-)#0#"
'0
Calibration Bad bit (BD). &'/ '0 '/ /#0 0, '$ 0&# !&++#) !)' .0',+
!,#$$'!'#+0/ !++,0 # /2#" ,. .#" -.,-#.)4
'0/ #0 0,
'0/
#/#.2#"
,."
'0
#0 0,
'0
Configuration mode bit (CF) &'/ '0 '/ /#0 3&#+ 0&# !,+$'%1.0',+
*,"# '/ /#)#!0#" '0 3,." '+ 0&# ),!( 0.+/$#. 3.'0# /#0 0, &#+
0&'/ '0 '/ /#0 0&# *,"1)# /001/ '+"'!0,. $)/&#/
'0
Field Power Off bit (FP) &'/ '0 '/ /#0 3&#+ 0&# $'#)" -,3#. $')/
&#+ 0&'/ '0 '/ /#0 0&# *,"1)# /001/ '+"'!0,. $)/&#/
'0
Power Up (unconfigured state) bit (PU). &'/ '0 '/ /#0 3&#+ 0&#
!,+$'%1.0',+ 3,." '/ )) 5#.,#/ "1# 0, .#/#0 "-0#. -,3#. !4!)# ,.
*,"1)# '+/#.0',+ ,. !)#.#" !,+$'%1.0',+ 3,." )) &#+ 0&'/ '0 '/ /#0
0&# *,"1)# /001/ '+"'!0,. $)/&#/
'0/
WireĆOff status bits. (W). &#/# '0/ 3&#+ /#0 '+"'!0# 0&#
!,..#/-,+"'+% !1..#+0 ,10-10 !&++#) '/ ,-#+ !,..#/-,+"/ 0, !&++#)
!,..#/-,+"/ 0, !&++#) #0!
'0/ #0 0,
,."
'0/
Hold output bits (P). &#/# '0/ .# /#0 '+ .#/-,+/# 0, ,. +"
0.+/'0',+ ,$ 0&# '0 &#+ ,. '/ /#0 0 '+"'!0# 0&0 0&# ,10-10
'/ &,)"'+% 0 0&# )#2#) '+ 0&# .#" !( "0 $,. 0&# .#/-#!0'2# !&++#) &#/#
'0/ .#01.+ 0, 3&#+ 0&# ,10-10 "0 *0!&#/ 0&# .#" !( ,10-10 "0
'0/
#0 0,
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