This time, we have brought an extremely compact module specifically designed for the Rockwell Automation SLC 500 system to our overseas friends in the field of industrial automation - the Allen Bradley 1746-IV32 32-point digital DC input module. As those who have configured PLC systems know, the space inside the cabinet is extremely limited. If we could use a single board to collect all 32 switch signals, it would be a huge space saver. As a professional supplier, Feimu Technology recommends this high-density and highly reliable DC input module to you, aiming to enable you to connect a large number of on-site sensor signals without increasing the volume of the cabinet.
The circuit board inside this 1746-IV32 adopts multi-layer wiring technology, and the optocouplers are neatly arranged. Each input channel has its own independent filtering circuit, which can filter out all the noise on the field lines and only pass the real switch signals to the CPU. The back panel interface on the back is a row of gold-plated pins, with good hardness and elasticity. When inserted into the SLC 500 rack, the clamping force is very tight, and there is no need to worry about it loosening even if the factory vibration is strong.
Its casing continues the tough style of AB's old PLC models. The black flame-retardant plastic shell is particularly thick, and it feels very substantial when touched. The front panel is designed to be particularly straightforward, with numbers from 0 to 31 printed densely, one for each input point, and a row of status lights next to it, which light up brightly green and highly visible. The detachable terminal block at the top is its signature design. Disconnecting it for wiring, and then reconnecting it to power it on is very convenient. Overall, it is a very classic and practical industrial board card.
The Allen Bradley 1746-IV32 is a 32-point digital DC input module for the SLC 500 system. It provides high-density input capability for connecting field sensors and switches. Refer to these specifications for proper configuration.
| Parameter | Specification |
|---|---|
| Product Model | Allen Bradley 1746-IV32 |
| Product Type | Digital DC Input Module |
| Compatible System | SLC 500 (1746 chassis) |
| Number of Inputs | 32 points |
| Input Voltage | 24V DC nominal (15V to 28V DC) |
| Input Current | 7mA typical at 24V DC |
| Input Grouping | 4 groups of 8 points |
| Input Delay (Off to On) | 0.5ms typical |
| Input Delay (On to Off) | 1ms typical |
| Off-state Leakage Current | 0.5mA maximum |
| On-state Voltage Threshold | > 15V DC |
| Off-state Voltage Threshold | < 5V DC |
| Isolation | Optical isolation (500V between field and backplane) |
| Backplane Current Draw | 85mA at 5V DC |
| Power Dissipation | 1.5W maximum |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Relative Humidity | 5% to 95% (non-condensing) |
| Certifications | UL, cUL, CE |
The 1746-IV32 uses a removable terminal block (RTB). The 32 input points are divided into 4 groups of 8 points each. Each group has its own common (COM) terminal.
Terminal assignment:
Wiring rules:
Field issue example: A customer connected sensors from different power supplies to the same group. The inputs showed intermittent readings. Cause: Different supply voltages caused ground loop currents. Fix: Separated sensors into different groups based on power supply. The readings became stable.
The 1746-IV32 has one diagnostic LED for each of the 32 input channels. The LEDs are visible on the front panel when the module is installed.
LED behavior:
Diagnostic checks:
The 1746-IV32 adds 32 input points to the SLC 500 system. Each input point adds a small amount of scan time. Calculate the impact on overall PLC scan time.
Scan time impact:
Full system scan time calculation:
Example calculation:
Allen Bradley 1746-IV32 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 operates from Jiangmen City, Guangdong Province, China. The company was founded in 2005 and has supplied automation components to customers in over 30 countries. Feimu Technology has been supplying Allen Bradley PLC spare parts for many years. There are some disassembled parts on the market where the connection holes of the terminal blocks are filled with copper oxide powder, or the screws are rusted and cannot be tightened. We are different. Every 1746-IV32 we receive, our engineers will use professional screwdrivers to test the looseness of each terminal hole's screws, and will also conduct batch on-off tests on the points.
Contact information:
Email: sales@feimutech.com
WhatsApp: +86 13358323579
Website: www.feimuplc.com
Response time: Within 24 hours. Technical questions typically answered within 12 hours. Include module serial number and application details when contacting.
A: Yes. The 1746-IV32 can be installed in any slot of the SLC 500 chassis (except slot 0, which is reserved for the power supply). The module is automatically recognized by the processor when the system is powered on. No manual configuration is required for slot assignment.
A: The 1746-IV32 is a sinking input module. This means the input circuit connects to the negative side of the DC supply. The sensor or switch provides the positive voltage to the input terminal. Most 24V DC sensors with NPN outputs are compatible. For PNP sensors, use a sourcing input module such as the 1746-IV16.
A: No. All inputs on the 1746-IV32 are rated for 24V DC (15V to 28V range). 12V DC signals may not reach the ON threshold and will not be detected. Use separate modules for different voltage levels. Also, do not connect sensors with different voltages to the same group common terminal. This will cause ground loop issues.
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