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Allen-Bradley 1785-L40E PLC-5/40E Ethernet Processor – Technical Specifications and FAQ
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | Allen-Bradley |
| Manufacturer | Rockwell Automation |
| Model | 1785-L40E |
| Product Series | PLC-5 |
| Product Type | Ethernet Programmable Logic Controller (PLC) Processor |
| Processor Model | PLC-5/40E |
| User Memory | 48K words |
| Maximum I/O Capacity | 2,048 points (any mix) or 2,048 inputs + 2,048 outputs (complementary) |
| Ethernet Port | 1 × Ethernet (TCP/IP) |
| DH+/Remote I/O Ports | 2 × DH+/Remote I/O (adapter or scanner) |
| Serial Port | 1 × RS-232-C / RS-422-A / RS-423-A configurable port |
| Maximum I/O Chassis | 61 total, including up to 60 remote chassis |
| Maximum I/O Racks | 16 |
| Supported I/O | 1771, 1794, 1746 and 1791 I/O families, subject to system configuration |
| Installation | 1771 I/O chassis, leftmost slot |
| Backplane Current | 3.6 A at 5V DC |
| Maximum Power Dissipation | 19 W |
| Operating Temperature | 0–60°C |
| Storage Temperature | -40–85°C |
| Relative Humidity | 5–95%, non-condensing |
| Operating Shock | 30 g |
| Non-operating Shock | 50 g |
| Vibration | 2 g at 10–500 Hz |
| Dimensions (H × W × D) | Approx. 150 × 35 × 260 mm (estimated module envelope) |
| Weight | 1.39 kg |
| Country of Origin | United States (distributor-listed; verify product nameplate) |
| Lifecycle Status | Discontinued |
FAQ
FAQ
Q1: What is the Allen-Bradley 1785-L40E?
A: It is a PLC-5/40E Ethernet processor designed for industrial automation, machine control, and distributed I/O applications.
Q2: What is the memory capacity of the 1785-L40E?
A: It provides 48K words of user memory for storing PLC programs and application data.
Q3: How many I/O points does this processor support?
A: It supports up to 2,048 I/O points in any mix, or 2,048 inputs and 2,048 outputs in a complementary configuration.
Q4: What communication interfaces are available?
A: It provides one Ethernet port, two DH+/Remote I/O ports, and one configurable serial port supporting RS-232-C, RS-422-A, and RS-423-A.
Q5: Which chassis is compatible with the 1785-L40E?
A: It is installed in a compatible Allen-Bradley 1771 I/O chassis, occupying the leftmost slot.
Q6: What is the power consumption?
A: The maximum power dissipation is 19 W, and the backplane current requirement is 3.6 A at 5V DC.
Q7: What are the dimensions and weight?
A: The estimated dimensions are approximately 150 × 35 × 260 mm (H × W × D), and the manufacturer documentation specifies a weight of 1.39 kg.
Q8: Is the 1785-L40E discontinued?
A: Yes. The 1785-L40E belongs to the legacy PLC-5 product family and is discontinued. It is generally available through industrial spare-parts suppliers, surplus dealers, and refurbishment providers.
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Packing & Delivery
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