Rockwell Automation 1794-IF4I, -OF4I, IF2XOF2I, -IF4IXT, -IF4ICFXT, -OF4IXT, IF2XOF2IXT FLEX I/O Isolated Analog Modules User Manual
Page 118
Publication 1794-6.5.8 - January 2010
118 Input, Output, Status and Configuration Files for Analog Modules when used with ControlNet
Word 3
Bits 10-11
(12-13)
Request for hold outputs (Q). – Channel request bits that instruct an output to hold its
output level when EN transitions from 0 to 1 to 0. When EN is 0, outputs go to a safe
state dictated by S1/S0. When EN returns to 1, the outputs will hold their level until the
output data equals the output level. P0–P3 indicates channels holding. Output read back
data shows what level is being held. Q0 = bit 08 (10) = channel 0; Q1 = bit 08 (10) =
channel 1, etc.
Bit 12 (14)
Interrupt Toggle bit (IT) – This bit, when set (1), permits interleaving of module
interrupts ensuring exchange of critical data when channels are configured for their
fastest update times. RTSI and “no low pass filter” must be 0 in order for the module to
recognize this feature. This groups data update rates for all channels to the slowest
configuration setting of any of the channels. In addition, channel update rates for all
channels with a 7.5ms update rate are reduced to 5.0ms. When reset (0), real time
sampling and filter features are enabled.
Bit 13 (15)
Transparent bit (TR). – This bit, when set to 1, permits configuration to be changed
without using the IC bit.
Bit 15 (17)
Initiate Configuration bit (IC). – When set (1), instructs the module to enter
configuration mode. Present configuration data prior to or coincident with IC being set.
Once IC returns to 0, additional configuration information is ignored.
Word 4
Bits 00-12
(00-14)
Not used.
Bits 13-14
(15-16)
Safe State Source bits (S1/S0). –Not used in ControlNet applications. Set these bits
off (0).
Bit 15 (17)
Output enable bit (EN)
Set this bit off (0) for the configuration block.
Set this bit on (1) for the output block.
Word 5
Bits 00-15
(00-17)
Output Channel 0 data.
Word 6
Bits 00-15
(00-17)
Output Channel 1 data.
Table 6.8
Word/Bit Descriptions for the 1794-IF2XOF2I Isolated Analog Combo Module
Write Word
Decimal Bit
(Octal Bit)
Definition
Table 6.9
Configuring Your Input Channels
Input Channel Configuration
03
02
01
00
Set these bits for Channel 0
07
06
05
04
Set these bits for Channel 1
Bit Settings
Input
Values
Data Format
% Underrange
%Overrange
Input Range
Module
Update
Rate
Hexadecimal
Decimal
(RTS = 0)
0
0
0
0
Channel not configured
0
0
0
1
4–20mA
signed 2’s complement
4% Under; 4% Over
<0000–7878>
<0000–30840>
7.5ms
0
0
1
0
+10V
signed 2’s complement
2% Under, 2% Over
<831F–7CE1>
<–31969–31969>
2.5ms
0
0
1
1
+5V
signed 2’s complement
4% Under, 4% Over
<8618–79E8>
<–31208–31208>
2.5ms
0
1
0
0
0–20mA
signed 2’s complement %
0% Under, 4% Over
0–10000>
0–10000>
7.5ms