1785-L80B

Technical specifications

Manufacturer

Allen-Bradley

Manufacturer part no.

1785-L80B

Type

PLC-5 processor

Application

PLC controller

Used with

1771 I/O chassis (leftmost slot)

Processor

PLC-5/80

Maximum user memory (words)

100K

Total I/O, maximum

3072 any mix or 3072 in + 3072 out (complement)

Channels

4 DH+/remote I/O

I/O chassis, maximum total

93

Remote I/O chassis, maximum

32 max/link

Power dissipation, maximum

17.3W

Backplane current load

3.3A

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

Weight

3 lbs, 2 oz (1.42 kg)

Technical documents (1)

• Rockwell Automation publication 1785-IN062 (specifications)

Key features

• Up to 93 I/O chassis, 32 remote I/O chassis per link
• Works with Bulletin 1771, 1794, 1746 and 1791 I/O
• Accepts 1785-ME32, 1785-ME64 and 1785-M100 memory modules
• Serial, DH+, DH using 1785-KA and remote I/O communication
• Operates from 0 to 60 °C in an open style enclosure

About the Allen-Bradley 1785-L80B

The Allen-Bradley 1785-L80B is a PLC-5/80 processor, described by Rockwell Automation as a PLC-5 Processor. Rockwell publication 1785-IN062 lists 100K words of maximum user memory, 4 DH+/remote I/O channels and a maximum of 3072 I/O, either any mix or 3072 in and 3072 out (complement). The same publication gives a power dissipation of 17.3W, a backplane current load of 3.3A and a weight of 1.42 kg (3 lbs, 2 oz). Rockwell's Product Lifecycle Search shows it as discontinued on 31 July 2017, with a replacement category of Engineering Replacement.

What is the 1785-L80B used for?

The 1785-L80B is the processor in a PLC-5 system built around 1771 chassis and I/O, and it fits the leftmost slot of 1771-A1B, -A2B, -A3B, -A3B1 and -A4B chassis. It works with Bulletin 1771, 1794, 1746 and 1791 I/O, including 8-, 16-, 32-point and intelligent modules, using 2-slot, 1-slot or 1/2-slot hardware addressing. It connects to other devices over serial, DH+, DH using a 1785-KA, and 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-L80B, 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 you order.