Feimu Technology, as a professional supplier, has specially prepared a key module for overseas industrial automation peers this time. As those who have configured systems know, in the field, there are often only 220V AC signals or isolated DC inputs. If they are directly connected to the PLC, it will definitely damage the board. Therefore, we recommend this high-density input module that supports both AC and DC to everyone. This is to enable you to directly connect it to the system when facing different voltage levels of field signals, saving time and effort.
|
Parameter Name |
Specific Specifications |
|
Product Model |
Allen Bradley 1746-IG16 |
|
Applicable System |
Allen Bradley SLC 500 Control System |
|
Module Type |
Digital Input Module |
|
Input Function |
AC/DC Dual Compatibility |
|
Input Channels |
16 Points (High-density Design) |
|
Backplane Interface |
96-pin, Thickened Gold-plated Pins |
|
Key Protection |
High-resistance Current-limiting Resistors, Rectifier Circuits |
Each input channel of this Allen Bradley 1746-IG16 device is equipped with high-resistance current-limiting resistors and rectifier circuits. It's like setting a checkpoint at the signal entry point, blocking excessive voltages and filtering out noise. The layout on the circuit board is spacious, and key parts are protected by insulating coatings to prevent dust and moisture from causing short circuits. The 96-pin backplane interface on the back has thickened and gold-plated pins, with excellent hardness and elasticity. When inserted into the baseplate of the frame, the grip force is particularly tight. Even if the factory vibration is very strong, there is no need to worry about poor contact causing signal interruption.
Many on-site devices output both DC and AC signals. With this board, you don't need to purchase two different modules. With just one of this type, you can handle everything. The spare parts inventory pressure is instantly relieved. Another notable feature is its "high-density design". 16 points are packed onto a single board. For old control cabinets with already limited space, this is a savior. It enables you to connect many more signals without increasing the cabinet size.
When shipping this kind of module with precise pins and long rectangular terminal blocks, the most worrying thing during transportation is that the violent courier service might accidentally bend those rows of gold pins or break the plastic terminal block. For Feimu Technology, the packaging they use is extremely professional. We first remove the terminal blocks and package them separately. Then, we put the main body of the module into an anti-static bag, wrap it with thick bubble foam, and tightly enclose the entire unit. Finally, we pack it into a high-strength cardboard box with specially designed foam. No matter whether you choose sea transportation or air transportation, our packaging can ensure that it reaches you with straight pins and intact terminal blocks.
The 1746-IG16 is unique among SLC 500 input modules. It accepts both AC and DC inputs on the same module. This eliminates the need to stock separate AC and DC input modules.
| Comparison | 1746-IG16 | AC-Only Module | DC-Only Module |
|---|---|---|---|
| Input type supported | AC + DC | AC only | DC only |
| AC voltage range | 100-132V AC | 100-132V AC | Not supported |
| DC voltage range | 10-60V DC | Not supported | 10-60V DC |
| Input points | 16 points | 16 points | 16 points |
| Best for | Systems with mixed signal types | Systems with only AC signals | Systems with only DC signals |
When to use AC/DC mode:
The 1746-IG16 uses a detachable terminal block. Correct wiring is essential for reliable operation. Follow these guidelines for AC and DC connections.
Terminal assignment:
Wiring rules for AC inputs:
Wiring rules for DC inputs:
Common wiring mistake: Mixing AC and DC signals on the same common terminal. Each group of 8 inputs shares one common terminal. All inputs in the same group must use the same voltage type (all AC or all DC). Mixing AC and DC on the same group will cause short circuits.
The Allen Bradley 1746-IG16 has built-in protection circuits. These protect the module and the PLC backplane from overvoltage and noise.
Protection features:
What happens during an overvoltage condition:
Field issue example: A customer connected 240V AC to a 1746-IG16 input. The module smoked and failed immediately. Cause: The module is rated for 132V AC maximum. Fix: Replaced the module. Installed a step-down transformer to reduce the voltage to 120V AC. Always check the voltage rating before connecting any input.
The 1746-IG16 has one diagnostic LED for each of the 16 input channels. The LEDs are visible on the front panel when the module is installed.
LED behavior:
Diagnostic checks:
Allen Bradley 1746-IG16 modules are commonly counterfeited. Use these checks to verify authenticity.
If the module shows incorrect readings or the LEDs behave abnormally, suspect a counterfeit. Contact Feimu Technology with photos for verification.
Feimu Technology does not ship untested modules. Each 1746-IG16 goes through the following verification process before leaving our warehouse.
Test reports are available upon request. Email sales@feimutech.com for a copy of your module's test report.
Q1: Can I mix AC and DC signals on the same 1746-IG16 module?
Yes, but not on the same group. The 1746-IG16 has 16 inputs divided into two groups of 8. Group 1 (inputs 0-7) shares one common terminal. Group 2 (inputs 8-15) shares another common terminal. You can connect AC signals to Group 1 and DC signals to Group 2. However, you cannot mix AC and DC signals within the same group. All inputs in one group must use the same voltage type. Mixing them on the same common terminal will cause a short circuit and may damage the module.
Q2: What happens if I connect 24V DC to an AC-only input module?
The module will not read the signal correctly. Most AC-only input modules require a minimum of 85V AC to turn on. A 24V DC signal is below this threshold. The LED will stay off and the PLC will not see the input. This is why the 1746-IG16 is useful. It accepts both 120V AC and 24V DC on the same module, so you do not need to stock separate modules for different voltage types.
Q3: The Allen Bradley 1746-IG16 accepts both AC and DC, but which voltage should I use?
This depends on the sensors in your system. Use AC inputs (100-132V) for AC proximity sensors, limit switches with AC coils, or devices that already run on 120V AC power. Use DC inputs (10-60V) for DC proximity sensors, photoelectric sensors, or devices with 24V DC outputs. The 1746-IG16 can handle both, so select the voltage that matches your field devices. Do not exceed 132V AC or 60V DC.
Q4: Can I replace an existing AC-only module with the 1746-IG16?
Yes. The 1746-IG16 is pin-compatible with standard SLC 500 input modules. It fits in the same chassis slot and uses the same terminal block wiring positions. However, check the voltage rating of your existing sensors. If they operate at 120V AC, the 1746-IG16 will work. If they operate at 240V AC, the 1746-IG16 is not suitable. Use the 1746-IA16 for 240V AC applications.
Q5: How do I know if my input signal is AC or DC?
Check the sensor label or wiring diagram. AC sensors are typically marked with "VAC" or "~". DC sensors are marked with "VDC" or "−". Measure the voltage with a multimeter if you are unsure. AC voltage will show a sinusoidal reading. DC voltage will show a constant reading. Never guess. Wrong voltage damages the module. The 1746-IG16 accepts both, but you still need to know which voltage you are connecting to wire it to the correct common terminal.
Feimu Technology is a supplier of industrial automation components in China, established in 2005. We don't just ship parts. We help maintenance teams and system integrators keep their production lines running.
Our core strengths:
We have worked with SLC 500 systems since they were first installed in factories. When you call with a configuration question or a wiring issue, you get someone who has done it before. Not a script. Not a referral to a manual.
Our warehouse holds over 5,000 active SKUs. A significant portion of that is SLC 500 modules, power supplies, and communication cards. If you need it, we are more likely to have it on the shelf than to tell you it is backordered.
We do not sell refurbished parts as new. Every module is inspected, cleaned, and tested before shipment. We are upfront about the product condition. No surprises when you open the box.
Standard orders placed before 3 PM China time leave the warehouse the same day. Urgent orders can be expedited. Packaging is done with care. We have shipped to over 30 countries and understand international logistics.
A 12-month warranty backs every module we sell. Our engineering team responds to technical questions within 24 hours, typically faster. We do not disappear after the invoice is paid.
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No. 26, Yuhu Street, Encheng Subdistrict, Enping City, Jiangmen City, Guangdong Province, China
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