1785-L40B/E Allen Bradley Processor Module
Specification
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Product Description
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The Allen‑Bradley 1785‑L40B/E is a PLC‑5/40 programmable logic controller (PLC) processor module designed for industrial automation systems requiring medium‑to‑large
control capacity. It’s part of Rockwell Automation’s PLC‑5 series, which has long been used in manufacturing, process control, material handling, and
other complex industrial environments. As a single‑slot CPU module, it fits into the left‑most slot of a compatible 1771 chassis and coordinates
logic execution, communications, and I/O processing duties for the entire control system.
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| More Technical Data |
| Product Type |
PLC‑5/40 Processor Module (Standard Processor)
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| Memory |
48 KWords user memory (battery‑backed SRAM)
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| Communication |
4 configurable ports (Adapter or Scanner)
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| Frequently Asked Questions |
Q1. What does “1785‑L40B/E” mean?
A:
“1785” is the Allen‑Bradley catalog prefix for PLC‑5 components. “L40B” designates the PLC‑5/40 processor model with a specific memory and communication
configuration, and “/E” typically denotes the Series E revision, indicating updated firmware/hardware revisions
compared to earlier series (A‑D).
Q2. Is this processor compatible with modern Allen‑Bradley systems like ControlLogix?
A:
No. The 1785‑L40B/E is designed for the PLC‑5 platform, which is a legacy system. It is not directly compatible with modern
ControlLogix or CompactLogix systems without gateway modules or protocol adapters.
Q3. What communication networks does it support?
A:
It supports Data Highway Plus (DH+) and Remote I/O through four dedicated ports. Additionally, a serial port can
be configured for RS‑232, RS‑422, or RS‑423 standards, primarily for
programming or point‑to‑point connections.
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About Moore
At Moore Automation LIMITED is a leading global supplier of control system components.
We specialize in control systems and drives. With many years of experience in the industrial sector,
we consistently deliver the highest quality of spare parts.We have tens of thousands of spare parts
and spare parts warehouse. Products and services to serve for installing of users control system,
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