The 1785-L46C15 is a high-performance ControlNet PLC-5 processor from Allen‑Bradley. It is designed to handle demanding industrial control applications. This controller features 48 Kilowords of user memory and supports a significant I/O capacity. It provides reliable and efficient control for field devices. The processor uses a ControlNet network for fast communication.
The 1785‑L46C15 processor is a member of the PLC‑5 family. It is equipped with a robust 48 Kilowords of battery‑backed static RAM. The controller also supports EEPROM backup using modules like the 1785-ME16, -ME32, -ME64, and -M100. This processor features protected memory for secure operation, which is a critical requirement in many facilities.
The 1785-L46C15 has a comprehensive I/O capacity. It supports a total of 2048 forcible I/O points. Meanwhile, it can handle up to 48,000 nonforcible analog I/O points. This flexibility allows it to manage a wide array of field sensors and actuators. The controller also manages up to 125 I/O chassis in total, providing extensive system scalability.
Furthermore, communication is a key strength of this PLC-5 processor. It includes a base‑configured ControlNet port with a 5 Mbit/s speed. This port supports up to 99 nodes per link with repeaters. Additionally, the controller features one RS-232-C/422-A/423-A port. It also has a coprocessor expansion port for enhanced functionality. The remote I/O and DH+ ports offer transmission speeds from 57.6 Kbit/s to 230.4 Kbit/s.
Specifically, the I/O scan time is efficient and varies with the network. It averages 0.5 ms per rack for ControlNet I/O. For Universal Remote I/O, it is 10 ms at 57.6 kbits/s, 7 ms at 115.2 kbits/s, and 3 ms at 230.4 kbits/s. This performance ensures timely responses to process changes. Therefore, the 1785-L46C15 is well‑suited for time‑sensitive automation environments.
The 1785-L46C15 draws a backplane current of 3.3 A at 5V DC. Its maximum thermal dissipation is 59 BTU/hour during operation. This controller operates reliably within a temperature range of 0 to 60 °C (32 to 140 °F). It also functions in environments with 5‑95% non‑condensing relative humidity. For storage, it can endure temperatures from ‑40 to 85 °C (‑40 to 185 °F).
Moreover, the controller is built to withstand industrial conditions. It tolerates an operational shock of 30G. It also handles vibration of 1G at frequencies from 10 to 500 Hz. The unit is designed with an open‑style enclosure. This makes it suitable for installation in control cabinets. The module weighs approximately 1.42 kg (3 lbs), which simplifies handling and mounting.
Proper installation of the 1785-L46C15 ensures optimal performance and longevity. First, ensure the chassis power is off before inserting or removing the processor. Align the module with the slot guides in the 1771 I/O chassis. Gently slide it into the selected slot until it seats firmly against the backplane connector. Secure the module by tightening the retaining screws on the top and bottom.
Next, configure the addressing hardware. The controller supports half‑slot, single‑slot, and double‑slot addressing systems. Key the chassis correctly using pins 40 and 42, as well as pins 54 and 56. This prevents incorrect module insertion. After physical installation, connect the ControlNet and other communication cables. Finally, apply power and verify the processor status via the front panel indicators.
When you receive the 1785-L46C15, the package includes the following items:
Allen-Bradley 1785-L46C15 ControlNet PLC-5 Processor unit (1 piece)
Product documentation and quick start guide (paper copy)
Anti-static protective packaging for safe transport
All orders are shipped using FedEx, UPS, or DHL. These services ensure fast and reliable delivery worldwide. Tracking numbers will be provided upon shipment.
Q1: What is the maximum memory capacity of the Allen-Bradley 1785-L46C15?
The 1785-L46C15 provides 48 Kilowords of user memory. This is sufficient for complex control logic and data handling in most mid‑sized industrial applications.
Q2: Which networks does the 1785-L46C15 support?
This processor primarily uses a ControlNet network for high‑speed communication. Additionally, it supports remote I/O and DH+ networks for connectivity with other devices.
Q3: Can the 1785-L46C15 work with existing 1771 I/O modules?
Yes, the 1785-L46C15 is fully compatible with the 1771 I/O chassis and modules. It also supports 1794, 1746, and 1791 series I/O modules.
Q4: Is the memory on this controller battery‑backed?
Absolutely. The controller uses battery‑backed static RAM to preserve program data during power outages. This ensures you do not lose your logic or configuration.
Q5: What is the difference between forcible and nonforcible I/O on the 1785-L46C15?
Forcible I/O allows manual overrides for troubleshooting or maintenance. The 1785-L46C15 supports up to 2048 forcible points. Nonforcible I/O is for standard operation and supports up to 48,000 points.
| Brand Name | |
| Model No. | 1785-L46C15 |
| Product Type | Processor |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
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