This controller delivers high-speed control for demanding processes. You can install the 1785-L86B in any single 1771 I/O chassis slot. It provides a robust solution for managing field devices.
Product Procurement & Buyer Guide
A Processor Built for Large-Scale Control
The 1785-L86B handles up to 3072 total analog inputs and outputs. This capacity suits complex automation lines that require precise analog measurement. You avoid needing multiple controllers for large systems.
The processor uses 100K words of battery-backed static RAM. This volatile memory stores your logic and data safely during power loss. You can also use EEPROM modules for a complete program backup.
Protected memory is a critical feature for this model. It secures your control program from accidental changes. This ensures your process remains stable and reliable during operation.
Matching the Controller to Your Chassis
This module draws 3.3 Amperes from the 5-volt backplane supply. You must calculate your chassis total power budget before installation. An overloaded backplane can cause unexpected shutdowns.
The controller supports up to 93 total I/O chassis links. You can place 32 universal remote chassis on a single link. This offers incredible flexibility for distributed plant-floor architectures.
You should verify your system uses compatible 1771 I/O modules. The processor works with 8-point, 16-point, 32-point, and intelligent modules. It uses 2-slot, 1-slot, or ½-slot addressing for hardware setup.
Expert Technical Evaluation & Performance Review
Processing Speed and Scan Time
The 1785-L86B provides a fast I/O scan time per rack. This ranges from 3 ms to 10 ms depending on baud rate. At 230.4 kbits/s the controller achieves a 3 ms scan for rapid response.
This speed is essential for high-speed packaging or assembly lines. The processor can read inputs, execute logic, and update outputs quickly. This minimizes system lag and improves product quality.
Communication and Isolation
Four Data Highway Plus and Remote I/O ports handle network communication. The processor also includes one RS-232-C/422-A/423-A serial port. This allows connection to HMIs or other serial devices.
The controller provides voltage isolation between communication ports. It is tested to 500V for 60 seconds. This isolation protects the processor from electrical noise on the network.
Environmental Tolerances
This processor operates reliably in harsh industrial environments. It functions from 0 to 60 degrees Celsius without issues. The unit also handles 5 to 95 percent relative humidity non-condensing.
The 1785-L86B withstands an operational shock of 30G. It also resists vibration of 2G at frequencies from 10 to 500 Hz. These tolerances make it suitable for high-vibration machinery.
The module also stores safely in extreme temperatures from -40 to 85 degrees Celsius. This allows you to keep spare units in unheated storage areas. The controller meets CSA, UL, C-TICK, and CE standards.
Logistics & Standard Packaging Details
We ship this product using express delivery options. You can choose FedEx, UPS, or DHL for fast service.
