Allen Bradley 1794 OA16

Allen Bradley 1794 OA16 has independent relays for each channel, which isolate the strong and weak electrical systems from interfering with each other. The position indicator lights provide real-time feedback on the on-off status, and hot-swappable replacement is supported without stopping the machine. Second-hand modules of this model are often plagued by contact corrosion and poor contact issues, which can easily cause equipment malfunctions and shutdowns. Feimu Technology as a senior industrial control supplier, each product is carried out channel by channel test, eliminate aging fault parts, to ensure long-term reliable operation on site.

Process of installation

Before the installation check:
Confirm the model for Allen Bradley 1794 OA16;
FLEX I/O terminal base (e.g. 1794 TB series);
Disconnect the power supply at the scene.
Install modules:
Install the terminal base on the DIN rail;
Aligning the interface, 1794 OA16 was inserted into the base and locked.
Wiring:
According to the 120 v AC loads connected to the terminal definition;
Check that the output terminal, power terminal and common terminal are connected correctly.
Configuration module:
FLEX is added in the PLC software I/O module;
Set the communication parameters and the I/O address.
Electric test:
Check LED status;
Test whether the 16 output points operate normally.

Field of Application

Industrial automation control: used for PLC system to control AC execution equipment.
Production line equipment: control conveyor, motor start and stop, indicator light, etc.
Mechanical manufacturing: Used for packaging machines, assembly lines, processing equipment's AC load control.
Process control: Controls solenoid valves, contactors, alarm devices, etc. at the site equipment.
Automobile and heavy industry: Applied to the output control of large-scale automated production systems.

Product Parameters

Parameters	Specifications
Output Type	Non-isolated AC Output
Rated Output Voltage	120V AC
Output Voltage Range	74～132V AC
Output Frequency	47～63 Hz
Maximum Output Current per Point	500 mA/point (at 55℃)
Total Module Output Current	4.0 A (16 points × 250 mA)
Minimum On-Current	5 mA/point
Maximum Output Voltage Drop	1.5V AC (at 0.5A)
Off-State Leakage Current	Maximum 2.25 mA
Surge Current	7 A, 40 ms duration (repeated every 8 seconds)
Isolation Voltage	120V AC continuous isolation (Field Side and Backplane)
FlexBus Current Consumption	80 mA @ 5V DC
Maximum Power Consumption	4.7 W
Maximum Heat Dissipation	16.1 BTU/hr
Recommended Terminal Base	1794-TBN, 1794-TB2, 1794-TB3, etc.
Operating Temperature	0～55℃

Service life

The actual service life of Allen Bradley 1794 OA16 depends on the working environment, load conditions, power-on time and maintenance situation. Generally speaking:
Design service life: Approximately 10 to 15 years or more (in normal industrial environment).
Typical stable operation period: Around 10 years or longer.
Relay/Semiconductor output life: Dependent on the load type and switching frequency. Frequent switching of AC loads will affect the life.

FAQ

Q1. Which devices can be directly controlled?

Commonly used for control: Electromagnetic valve
Contactor
Relay coil
Alarm light Indicator light

Small AC control device

Q2. What could be the reasons if the PLC fails to recognize it?

Common reasons:
FLEX I/O network communication failure
Module installation not in place
Terminal base connection不良
PLC configuration error
I/O address setting error
Solution：
Check the adapter status
Check the FlexBus connection
Confirm the Studio 5000/RSLogix configuration

Q3. The output LED is on but the device does not operate. What is the reason for this?

Possible causes:
The AC power supply not access
Damage to load
Wrong wiring
Output safety or protection device failure
Insufficient load current
Suggested to check: Output terminal voltage; Load impedance; Field lines.

Q4. The output remains conducting. What should be done?

Possible reasons:
PLC program logic errors
Short circuit of the output point
Output device damaged
Handling:
Online monitoring PLC output state
Check program logic
Measure field output voltage

Q5. What are the maintenance priorities?

Regularly checking terminal connection tightness
Checking if AC loads exceed the limit
Keeping the control cabinet dry and clean
Regularly backing up PLC configuration
Keeping spare modules available

Choose Our Advantages

The Allen Bradley 1794 OA16 is a core component of the production line actuator. The original factory supply of the old model has been interrupted, and high-quality spare parts are hard to find. As a professional supplier of Rockwell distributed modules, our company has a complete supply of original products, efficient delivery, and also provides base matching, wiring debugging basic technical support, and solves the maintenance and procurement problems of industrial control sites in one step.