1785-L40B/E Allen Bradley Processor Module
Specification
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Product Description
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The 1785‑L40B Allen‑Bradley is a PLC-5/40 standard processor module from Allen-Bradley’s classic PLC-5 automation family. It serves as the central control unit in industrial
programmable logic controller (PLC) systems, engineered for medium to large automation applications such as manufacturing lines, process control,
material handling, and distributed control architectures.This processor is designed to be inserted into a 1771 series I/O chassis
(e.g., 1771-A1B, A2B, A3B, A4B). The Series E revision (denoted by “/E”) indicates updated interna
l firmware/hardware improvements over earlier revisions.
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| More Technical Data |
| Digital I/O Cable |
PLC-5/40 standard CPU processor
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| User Memory |
48 KWords battery-backed static RAM (program and data memory)
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| Remote Expansion |
Supports up to 61 total PLC-5 chassis (1 local + up to 60 remote) via Remote I/O connections
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| Frequently Asked Questions |
Q: What does the “/E” in 1785-L40B/E mean?
A: It refers to the Series E revision of the 1785-L40B processor, indicating updated internal components/firmware over earlier series (A–D).
Functionality remains consistent with PLC-5/40 specifications.
Q: Can I expand memory or protect the program on this module?
A: Yes — you can add EEPROM memory modules (like 1785-ME16/32/64/M100) for non-volatile backup. However, protected
memory features (e.g., hardware write protection) are not natively included.
Q: What communication protocols does it support?
A: It supports Data Highway Plus (DH+), Remote I/O networking, and serial communication
via a configurable port (RS-232, RS-422, RS-423).
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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,
Distributed control systems,programmable controllers,panel controller and drive!
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