1785-L40E

Technical specifications

Manufacturer

Allen-Bradley

Manufacturer part no.

1785-L40E

Type

PLC-5 Ethernet processor

Application

PLC controller

Used with

1771 I/O chassis (leftmost slot)

Processor

PLC-5/40E

Maximum user memory (words)

48 k

Total I/O, maximum

2048 any mix or 2048 in + 2048 out (complement)

Channels

1 Ethernet; 2 DH+/remote I/O

I/O chassis, maximum total

61

Remote I/O chassis, maximum

60

Power dissipation, maximum

19 W

Backplane current load

3.6 A

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-ME16, 1785-ME32, 1785-ME64, 1785-M100

Isolation

50V basic insulation between communication ports and between communication ports and backplane; tested to withstand 500V rms for 60 s

Wire size

Ethernet: 802.3 compliant shielded or unshielded twisted pair; remote I/O: 1770-CD cable

Weight

3 lb, 1 oz (1.39 kg)

Technical documents (1)

• Rockwell Automation publication 1785-IN063 (specifications)

Key features

• One Ethernet channel for 802.3 compliant twisted pair cabling
• Two DH+/remote I/O channels
• Supports up to 60 remote I/O chassis
• Accepts 1785-ME16, 1785-ME32, 1785-ME64 and 1785-M100 memory modules
• Open style enclosure with 3.6 A backplane current load

About the Allen-Bradley 1785-L40E

The Allen-Bradley 1785-L40E is a PLC-5 Ethernet processor, listed by Rockwell Automation as the PLC-5/40E. Rockwell publication 1785-IN063 gives 48 k words of maximum user memory and a maximum of 2048 total I/O, either any mix or 2048 in and 2048 out (complement). It has one Ethernet channel and two DH+/remote I/O channels, and supports up to 61 I/O chassis in total, of which up to 60 can be remote. Rockwell's lifecycle search shows it as discontinued on 31 December 2014, with a replacement category of Engineering Replacement.

What is the 1785-L40E used for?

The 1785-L40E is the processor of a PLC-5 system and sits in the leftmost slot of a 1771-A1B, -A2B, -A3B, -A3B1 or -A4B chassis. It works with Bulletin 1771, 1794, 1746 and 1791 I/O, including 8-, 16- and 32-point and intelligent modules, using 2-slot, 1-slot or 1/2-slot hardware addressing. Remote I/O connects with 1770-CD cable, and the Ethernet channel uses 802.3 compliant shielded or unshielded twisted pair.

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-L40E, and note the series letter and firmware revision printed beside it. Send us a photo of the label if you want us to confirm the part before you order.