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Allen-Bradley

Allen-Bradley 1785-L40L PLC-5/40L Standard Processor Module

SKU 1785-L40L

In stock

12-month warranty
Free returns within 30 days

Manufacturer: Allen-Bradley
Product No.: 1785-L40L
Origin United States
Product Type: CPU Module
Barcode: 8537101190
Payment: T/T, Western Union
Weight: 1.53 kg
Dimensions: 4.8cm x 16.7cm x 27.4cm
Shipping port: Xiamen
Warranty: 12 months

Product Description

Description

The Allen-Bradley 1785-L40L is a standard processor hardware component operating within the PLC 5 automated architecture to systematically govern and integrate distributed plant machinery networks. This computing core delivers a maximum user memory capacity of 48 Kilowords to coordinate field transactions across a broad spectrum of input and output subsystems. Slot placement requires mounting into the leftmost bay of a standard 1771 I/O chassis layout, executing physical command handling over up to 2048 total I/O configurations. Network tracking is sustained via double Data Highway Plus (DH+) or Remote I/O interfaces, supporting selectable adapter or scanner mode configurations to interface with peripheral hardware devices. The automation module supports detailed addressing layouts including half-slot, single-slot, and double-slot assignments to handle 8-point, 16-point, and 32-point modules seamlessly. For extended processing topologies, it bridges directly with an extended local I/O adapter link, driving structured hardware tracking loops across multi-chassis floor networks.

Features

Hosts an internal battery-backed static RAM layout for variable storage and operational register execution.
Direct interface capability with supplementary EEPROM program non-volatile backup cartridges.
Dual functional communication interface supporting configurable scanner and adapter operational profiles.
Hardware slot compatibility with intelligent bulletin 1771, 1794, 1746, and 1791 I/O modular blocks.
Multi-channel electrical isolation protection certified between serial connection logic pathways and relay components.
Scalable localized scanning matrix extending control routines across remote chassis branches.

Applications

High-density industrial factory automation lines requiring centralized logic processing with extended local I/O links.
Distributed monitoring architectures interacting across complex Data Highway Plus (DH+) automation systems.
Multi-chassis infrastructure processing in manufacturing assemblies.

Technical Specifications

Performance Specifications

Parameter	Specification
Processor Type	PLC-5/40L Standard Processor
Max User Memory Words	48 Kilowords
Battery-Backed Static RAM	Yes
EEPROM Program Backup Options	1785-ME16, 1785-ME32, 1785-ME64, 1785-M100
Protected Memory	No
Max Total I/O	2048 (any mix) or 2048 in + 2048 out (complementary)
Max Analog I/O	2048
Extended Local I/O Scan Time Per Rack	0.5 ms
Remote I/O Scan Time (57.6 kbits/s)	10 ms
Remote I/O Scan Time (115.2 kbits/s)	7 ms
Remote I/O Scan Time (230.4 mbits/s)	3 ms

Power Requirements & Electrical

Parameter	Specification
Backplane Current Draw	3.3A at 5V DC
Power Dissipation	17W
Isolation Voltage (Tested for 60s)	500 Volts and 1000 Volts between communication ports / relay cartridge
Relay Cartridge Support	1785-RC

Communication & Interface Capabilities

Parameter	Specification
Control Coprocessor Expansion Port	Yes
RS-232-C/422-A/423-A Ports	1
Communication Networks	Data Highway Plus (DH+), Remote I/O
Max I/O Chassis Total	61
Max I/O Chassis Extended Local	16
Max I/O Chassis Universal Remote	32 Max. Per I/O Link
Maximum I/O Racks	16

Mechanical & Environmental

Parameter	Specification
Manufacturer	Allen-Bradley
Part Number	1785-L40L
UPC	612598124022
Enclosure Type	Open
Operating Temperature Range	0 to 60 Celsius
Weight	3.38 lbs (1.53 kg) / 1.42 kilograms

Installation Guidelines

Install the central processing assembly exclusively into the designated leftmost slot of the 1771 I/O chassis array.
Ensure backplane power supplies are properly rated to provide the required 3.3A current load at 5V DC without causing logic rail drops.
Structure field communication links with correct termination configurations when scanning across the maximum limit of 16 extended local chassis components.
Maintain the surrounding environmental temperature field strictly within the specified 0 to 60 Celsius boundary limits.

Compliance and Certifications

UL
CE
C-TICK
CSA

Shipping & Returns

Global Express Shipping

Standard Delivery: 4–6 business days via DHL, FedEx, and UPS.
Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
Worldwide Coverage: Serving over 150 countries.

Returns & Warranty

30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
12-Month Warranty: Every industrial component is backed by our technical warranty.

FAQ

What is the maximum number of extended local I/O chassis that the device can scan?

The device forms an Extended Local I/O link when paired with an appropriate adapter, allowing for a maximum scan capacity of up to 16 extended local I/O chassis.

What are the exact backplane electrical power criteria for this processor module?

The processor module draws a backplane current of 3.3A at 5V DC from the 1771 chassis power supply and dissipates 17W of heat during normal operation.

Which hardware configurations are accessible for non-volatile EEPROM backup implementation?

The device supports application backup routines via optional memory modules, explicitly compatible with the 1785-ME16, -ME32, -ME64, and -M100 catalog assemblies.

Reviews

1785-L40L

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