1785-L11B

Technical specifications

Manufacturer

Allen-Bradley

Manufacturer part no.

1785-L11B

Type

PLC-5 processor

Application

PLC controller

Used with

1771 I/O chassis (leftmost slot)

Processor

PLC-5/11

Maximum user memory (words)

8K

Total I/O, maximum

512 any mix or 384 in + 384 out (complement)

Channels

1 DH+/remote I/O

I/O chassis, maximum total

5

Remote I/O chassis, maximum

4

Power dissipation, maximum

12W

Backplane current load

2.3A

Operating temperature

0...60 °C (32...140 °F)

Storage temperature

-40...85 °C (-40...185 °F)

Relative humidity

5...95% noncondensing

Vibration

2 g @ 10...500 Hz

Shock

Operating 30 g; non-operating 50 g

Enclosure type rating

None (open style)

Time-of-day clock/calendar

Maximum variation at 60 °C: ±5 min per month; typical at 20 °C: ±20 s per month

I/O modules

Bulletin 1771 I/O, 1794 I/O, 1746 I/O, and 1791 I/O, including 8-, 16-, 32-pt and intelligent modules

Hardware addressing

2-slot, 1-slot or 1/2-slot

Location

1771-A1B, -A2B, -A3B, -A3B1, -A4B chassis; leftmost slot

Replacement battery

Allen-Bradley 1770-XYC

Available cartridges

1785-RC Relay Cartridge

Memory modules

1785-ME32, 1785-ME64, 1785-M100

Communication

Serial; DH+; DH using 1785-KA; remote I/O

Isolation voltage

Communication ports tested to 500V for 60 seconds

Technical documents (1)

• Rockwell Automation publication 1785-IN062 (specifications)

Key features

• Supports Bulletin 1771, 1794, 1746 and 1791 I/O
• Maximum 5 I/O chassis in total, 4 remote I/O chassis
• Memory modules 1785-ME32, 1785-ME64 and 1785-M100 available
• Serial, DH+, DH using 1785-KA and remote I/O communication
• Operating temperature 0 to 60 °C, open style enclosure

About the Allen-Bradley 1785-L11B

The Allen-Bradley 1785-L11B is a PLC-5 processor, described by Rockwell Automation as the PLC-5/11. Rockwell publication 1785-IN062 lists 8K words of maximum user memory, a maximum of 512 I/O in any mix or 384 in plus 384 out (complement), and one DH+/remote I/O channel. The same publication gives a maximum power dissipation of 12W and a backplane current load of 2.3A. Rockwell's Product Lifecycle Search shows it as discontinued on 31 December 2012, with a replacement category of Engineering Replacement.

What is the 1785-L11B used for?

The 1785-L11B runs the user program in a PLC-5 system and scans local and remote I/O. It sits in the leftmost slot of a 1771-A1B, -A2B, -A3B, -A3B1 or -A4B chassis and works with Bulletin 1771, 1794, 1746 and 1791 I/O, including 8-, 16-, 32-point and intelligent modules. Hardware addressing can be 2-slot, 1-slot or 1/2-slot, and communication is by serial, DH+, DH using a 1785-KA, or remote I/O.

Lifecycle and successor

Discontinued.

Before you order

What to photograph or confirm so the right unit is quoted.

Check that the catalog number on the label reads 1785-L11B, and note the series letter and firmware revision printed there. Send us a photo of the label if you want us to confirm the part before ordering.