Rockwell Automation 1794-IF2XOF2IXT FLEX XT I/O Isolated Input Analog Module - Manual (Page 4)

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Publication 1794-IN129B-EN-P - April 2009
Configure Your Input Channels 1794-IF4IXT, 1794-IF2XOF2XT)
Input Update Rate for Real Time Sample Interval = 0 (1794-IF4IXT,
1794-IF2XOF2XT)
Configure Your Output Channels (1794-OF4IXT)
Set the Input Filters
Power/status Indicator
The OK status indicator is bicolor red and green. The indicator flashes
green for any of the following 3 reasons:
1. The module configuration word is zero (for example, powerup
reset condition).
2. The 24V DC user power is off.
3. The module is in configuration mode.
The indicator displays red to indicate the module did not pass the initial
hardware test. Recycle power.
After powerup, if the status indicator is not flashing green or solid green,
recycle module power to verify a proper reset of the bus interface.
Specifications
Input Channel Configuration
03 02 01 00 Set these bits for channel 0
07 06 05 04 Set these bits for channel 1
11 10 09 08 Set these bits for channel 2
15 14 13 12 Set these bits for channel 3
Bit Settings Input
Values Data Format % Underrange
% Overrange
Input Range
0 0 0 0 Channel not configured
0 0 0 1 4…20 mA signed 2’s
complement
4% under; 4% over <0000-7878>
0 0 1 0 ±10V 2% under; 2% over <831F-7CE1>
0 0 1 1 ±5V 4% under; 4% over <8618-79E8>
0 1 0 0 0…20 mA signed 2’s
complement %
0% under; 4% over <0…10000>
0 1 0 1 4…20 mA 4% under; 4% over <0…10000>
0 1 1 0 0…10V 0% under; 2% over <0…10000>
0 1 1 1 ±10V 2% under; 2% over <-10000…10000>
1 0 0 0 0…20 mA binary 0% under; 4% over <0000…F3CF>
1 0 0 1 4…20 mA 4% under; 4% over <0000…F0F1>
1 0 1 0 0…10V 0% under; 2% over <0000…F9C2>
1 0 1 1 0…5V 0% under; 4% over <0000…F3CF>
1 1 0 0 ±20 mA offset binary,
8000H = 0 mA
4% under; 4% over <0618…F9E8>
1 1 0 1 4…20 mA offset binary,
8000H = 4 mA
4% under; 4% over <8000…F878>
1 1 1 0 ±10V offset binary,
8000H = 0 mA
2% under; 2% over <031F…FCE1>
1 1 1 1 ±5V 4% under; 4% over <0618…F9E8>
Configuration Bits
MSD LSD
Input
Nominal
Ranges Channel Update
Rate (1) RTSI = 0 and
No low pass filter
(1) When IT = 1, the channel update rate for all channels is determined by the slowest channel.
Channel Update Rate (1)
RTSI and Filter = 0
IT bit = 1
0 0 0 1 4…20 mA 7.5 ms 5.0 ms
0 0 1 0 ±10V 2.5 ms 2.5 ms
0 0 1 1 ±5V 2.5 ms 2.5 ms
0 1 0 0 0…20 mA 7.5 ms 5.0 ms
0 1 0 1 4…20 mA 7.5 ms 5.0 ms
0 1 1 0 0…10V 5.0 ms 5.0 ms
0 1 1 1 ±10V 5.0 ms 5.0 ms
1 0 0 0 0…20 mA 2.5 ms 2.5 ms
1 0 0 1 4…20 mA 7.5 ms 5.0 ms
1 0 1 0 0…10V 2.5 ms 2.5 ms
1 0 1 1 0…5V 2.5 ms 2.5 ms
1 1 0 0 ±20 mA 2.5 ms 2.5 ms
1 1 0 1 4…20 mA 7.5 ms 5.0 ms
1 1 1 0 ±10V 2.5 ms 2.5 ms
1 1 1 1 ±5V 2.5 ms 2.5 ms
Configuration Bits
MSD LSD
Nominal
Range Data Type Output Values Module Update
Rate
0 0 0 1 4…20 mA Signed 2’s
complement
<0000-7878> 5.0 ms
0 0 1 0 ± 10V <831F-7CE1> 2.5 ms
0 0 1 1 ± 5V <8618-79E8> 2.5 ms
0 1 0 0 0…20 mA Signed 2’s
complement %
<0-10000> 5.0 ms
0 1 0 1 4…20 mA <0-10000> 5.0 ms
0 1 1 0 0…10V <0-10000> 5.0 ms
0 1 1 1 ± 10V <-10000-10000> 5.0 ms
1 0 0 0 0…20 mA binary <0000-F3CF> 2.5 ms
1 0 0 1 4…20 mA <0000-F0F1> 5.0 ms
1 0 1 0 0…10V <0000-F9C2> 2.5 ms
1 0 1 1 0…5V <0000-F3CF? 2.5 ms
1 1 0 0 0…20 mA offset binary <0618-F9E8> 2.5 ms
1 1 0 1 4…20 mA <8000-F878> 5.0 ms
1 1 1 0 ± 10V <031F-FCE1> 2.5 ms
1 1 1 1 ± 5V <0618-F9E8> 2.5 ms
Input Channel Configuration
03 02 01 00 Set these bits for channel 0
07 06 05 04 Set these bits for channel 1
11 10 09 08 Set these bits for channel 2
15 14 13 12 Set these bits for channel 3
Bit Settings A/D Conversion Rate Low Pass Filter
0 0 0 0 1200 Hz No low pass
0 0 0 1 1200 Hz 100 ms low pass
0 0 1 0 1200 Hz 500 ms low pass
0 0 1 1 1200 Hz 1000 ms low pass
0 1 0 0 600 Hz No low pass
0 1 0 1 600 Hz 100 ms low pass
0 1 1 0 600 Hz 500 ms low pass
0 1 1 1 600 Hz 1000 ms low pass
1 0 0 0 300 Hz No low pass
1 0 0 1 300 Hz 100 ms low pass
1 0 1 0 300 Hz 500 ms low pass
1 0 1 1 300 Hz 1000 ms low pass
1 1 0 0 150 Hz No low pass
1 1 0 1 150 Hz 100 ms low pass
1 1 1 0 150 Hz 500 ms low pass
1 1 1 1 150 Hz 1000 ms low pass
General (Input)
Attribute Value
Number of inputs 4 isolated (1794-IF4IXT)
2 isolated (1794-IF2XOF2XT)
Resolution
Voltage
Current
16 bits - unipolar; 15 bits plus sign - bipolar
0.156 mV/cnt unipolar; 0313 mV/cnt bipolar
0.320 μ A / cnt unipolar; 0.640 μ A / cnt bipolar
Update rate 2.5/5.0/7.5 ms all channels (see input update rate table)
2.5/5.0 ms all channels (see input update rate table) (1794-OF4IXT)
Input current terminal 4…20 mA (user configurable)
0…20 mA (user configurable)
±20 mA (user configurable)
Input voltage terminal ±10V (user configurable)
0…10V (user configurable)
±5V (user configurable)
0…5V (user configurable)
Input Resistance
Voltage terminal
Current terminal
>10 M Ω
<100 Ω (1)
(1) If 24V DC is removed from the module, input resistance = 10 k Ω