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I/O chassis for I/O modules, 16 slots 1771A4B | Image

I/O chassis for I/O modules, 16 slots 1771A4B | Image

Includes a PDF Supply Company, LLC warranty.
PDF Supply Company, LLC is not an authorized distributor for Allen Bradley



1 In Stock

1 Yr PDF Supply warranty

What is Surplus?



7 In Stock

1 Yr PDF Supply warranty

What is Refurbished?

Repair Service


5-10 Days

1 Yr PDF Supply warranty


Other Available Revisions for the 1771-A4B 1771-A4B//A1771-A4B//B

Common misspellings:
  • l771-A4B
  • 177l-A4B
  • 1771-AAB
  • 1771-A48
  • 1771A4B


The 1771-A4B is an Allen-Bradley I/O chassis for mounting the 1771 I/O modules. The 1771-A4B has 16 slots and it supports the back panel mounting type. The I/O chassis measures approximately 12.4 inches by 24 inches by 7.6 inches. The 1771-A4B weighs 6.7Kgs in average. The 1771-A4B provides an open type enclosure, has a 15g operating shock rating and a 30g non-operating shock. The 1771 PLC-5 system requires the I/O chassis like the 1771-A4B to enhance the mounting of its various modules. With the 1771 PLC-5 system modules mounted on the 1771-A4B chassis, communication across the processor module, the I/O modules, and the I/O adapter module is achieved through the backplane.


The 1771-A4B I/O chassis does not accept an assigned I/O rack number at the beginning of the 1771-A4B I/O chassis. Whether you choose the 2-slot, 1-slot, or 12-slot addressing, the beginning I/O group number is 0 when assigning the I/O rack number in the 1771-A4B I/O chassis. The 1771-A4B has a higher backplane current strength and it supports even high density addressing of the I/O modules.


The backplane switches of the 1771-A4B chassis should be set accordingly for the PLC-5 processor. All the backplane swathes: 1, 4, 5, 6, 7, 8, should also be identified and switched accordingly on the PLC-5 processors. At an industrial setting, the 1771-A4B is meant to be operated within a temperature range of between 0 and 60 degrees Celsius. At an operating frequency between 10 and 500Hz, the 1771-A4B I/O chassis has a 2g vibration rating.

I/O chassis for I/O modules, 16 slots 1771A4B

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PDF Supply Company, LLC. sells surplus and refurbished products, which are sourced through independent channels. All warranties and support, if applicable, are with PDF Supply Company, LLC. and not the manufacturer; manufacturer warranties do not apply. PDF Supply Company, LLC. is not an authorized distributor or representative for the listed manufacturers and makes no representations as to any quality control performed by any listed manufacturers on the products. The products listed on this website may vary as to their country of origin; the accessories, and other items included with the product; and the language used on the packaging, the parts, and any related instructions or printed material related to the products. PDF Supply Company, LLC. does not sell or license software that may be needed to operate certain hardware and customers must obtain any necessary software licensing, maintenance, or upgrades from the manufacturer or other authorized source. This website is not sanctioned or approved by any manufacturer or other authorized source. This website is not sanctioned or approved by any manufacturer or tradename listed. Designated trademarks, brand names and brands appearing herein are the property of their respective owners.