Allen-Bradley 1794-IE4XOE2 Flex I/O Analog Combo Module
Technical Specifications of the 1794-IE4XOE2
Inputs: 4 single‑ended, non‑isolated
Input current ranges: 0‑20mA, 4‑20mA
Input voltage ranges: ±10VDC, 0‑10VDC
Outputs: 2 single‑ended, non‑isolated
Output ranges: 0‑20mA, 4‑20mA, ±10VDC
- Conversion type (inputs): Successive approximation
Conversion type (outputs): Pulse Width Modulation (PWM)
FlexBus current: 20mA
Moreover, the input conversion rate is 256µs per channel. Step response to 63% is 9.4ms for voltage and 18.2ms for current. Absolute accuracy reaches 0.20% Full Scale @ 25°C for inputs. For outputs, accuracy is 0.133% Full Scale @ 25°C.
Compatible Terminal Bases and Mounting
The 1794‑IE4XOE2 requires a separate terminal base. This base provides screw connections and backplane pins. Suitable terminal bases include:
1794‑TB2
1794‑TB3
1794‑TB3S
1794‑TB3T
1794‑TB3TS
Mounting is on standard DIN rail. Wire size depends on the terminal base you choose. Always check the specific base manual for torque and gauge limits.
Environmental and Mechanical Ratings
Storage temperature: –40 to 85 °C (–40 to 185 °F)
Vibration: 5g @ 10 to 500 Hz
Operating shock: 30g
Thermal dissipation: 10.2 BTU/hr @ 31.2V DC max.
Power dissipation: 4 Watts max @ 31.2V DC
Dimensions: 1.8 x 3.7 x 2.1 inches (46 x 94 x 53 mm)
Furthermore, the module requires 24V DC power (19.2 to 31.2V DC). Current draw is 70mA at 24V DC. Keep the 1794‑IE4XOE2 away from extreme humidity and conductive dust.
Installation Guidelines for the 1794-IE4XOE2
First, mount the terminal base on DIN rail. Next, snap the 1794‑IE4XOE2 into the base. Then, wire your analog signals according to the terminal base type. For current loops, use shielded twisted‑pair cable. For voltage inputs, keep cable runs short.
After wiring, configure the input and output ranges via your controller software. For instance, set a 4‑20mA input channel to read a pressure transmitter. Set a ±10V output to control a servo drive. Finally, test each channel with a known signal before full system startup.
⚠️ Because the inputs and outputs are non‑isolated, avoid ground loops. Use a single common reference point for all analog circuits.
Packaging List
Note: Terminal base is sold separately. No certificate or warranty documents are included. Shipping via FedEx, UPS, or DHL.
Frequently Asked Questions (FAQ)
1. Can the 1794‑IE4XOE2 mix current and voltage on different inputs?
Yes, each input channel is independently configurable. You can set channel 0 for 4‑20mA and channel 1 for ±10VDC on the same module.
2. What terminal base works best with the 1794‑IE4XOE2?
The 1794‑IE4XOE2 works with 1794‑TB2, ‑TB3, ‑TB3S, ‑TB3T, and ‑TB3TS bases. Choose based on your wiring density needs.
3. Is the 1794‑IE4XOE2 isolated from the backplane?
No, the analog channels are non‑isolated from each other and from the backplane. Use external isolators if needed.
4. How do I calculate the digital value for a 4‑20mA signal?
Data is left‑justified 16‑bit 2’s complement. For 4‑20mA, 4mA = 0 and 20mA = 32767 (unipolar range).
5. Can I replace a failed 1794‑IE4XOE2 without removing wiring?
Yes, because the terminal base holds the wiring. You can snap out the module and insert a new 1794‑IE4XOE2 without rewiring.
