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1785-L20E | Allen Bradley | PLC-5 1785L20E

  • Brand/ Manufacturer:

    Allen Bradley
  • Dimensions:

  • Weight:

  • Country of Origin: :

    United States
  • Description:

    PLC-5/20 Ethernet Processor

Mfr. Part Number:



         Allen-Bradley / Rockwell Automation


Allen-Bradley 1785-L20E PLC-5 EtherNet/IP PLC-5/20 Controller, 16K Word

Full Description:

Allen-Bradley 1785-L20E PLC-5 EtherNet/IP PLC-5/20 Processor, 16K Word SRAM. Embedded TCP/IP 

communication capabilities to communicate with other Ethernet PLC-5 processors and host computers. 

The PLC-5/20 integrate Allen-Bradley architecture into the standard TCP/IP network, offering high-

performance peer-to-peer communication via use of PLC-5 message instructions. The processors is 

optimized for real-time sequential and regulatory control.

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The Allen-Bradley 1785-L20E is a PLC5 processor. This module is a major component of the legacy PLC5 product category. This controller is a single slot module that is compatible with 1771-A1B, -A2B, A3B, -A3B1, or the -A4B chassis. This controller is ideal for use medium range automation requirements as it supports a total of 512 I/O (mixed) and 512 input / output (complementary).

The 1785-L20E has a built-in volatile memory that amounts to 16KWords, which is maintained by a Lithium battery with catalog number 1785-XYC. This battery provides the necessary energy to maintain the contents of the controller’s SRAM to allow the controller to continuously function. 

For backup and increased system availability, non-volatile memory back up devices may be installed such as 1785-ME16 with 16Kwords, 1785-ME32 with 32Kwords, 1785-ME64 with 64 Kwords and 1785-ME100 with 100Kwords.

The 1785-L20E’s embedded communication interfaces include One (1) DH+ dedicated interface, One (1) DH+/Remote I/O (Adapter or Scanner) combination interface, One (1) serial port that supports RS-232, 423 and RS-422A standards and One (1) Ethernet channel that supports 10/100 Mbps transmission speed.


Rockwell Automation

Part Number/Catalog No.


Programming Software:

RSLogix 5

Non-Operating Temperature:

IEC 60068-2-1 (Test Ab, Un-packaged Nonoperating Cold), IEC 60068-2-2 (Test Bc, Un-packaged Nonoperating Dry Heat), IEC 60068-2-14 (Test Na, Un- packaged Nonoperating Thermal Shock): –40...85 o C (– 40...185 o F)

Operating Temperature:

EC 60068-2-1 (Test Ad, Operating Cold), IEC 60068-2-2 (Test Bd, Operating Dry Heat), IEC 60068-2-14 (Test Nb, Operating Thermal Shock): 0...60 o C (32...140 o F)

Remote I/O:

12 chassis

Maximum Number of I/O Racks:

4 (0-3)




16 Kwords

Embedded Communication interfaces:

1 DH+ (Fixed) 1 DH+/Remote I/O (Adapter or Scanner) 1 serial port, configurable for RS-232 and 423 and RS-422A standards; Ethernet

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