1756-L61

Technical specifications

Manufacturer

Allen-Bradley

Manufacturer part no.

1756-L61

Type

ControlLogix controller

Application

PLC controller

Used with

ControlLogix 1756 chassis

Controller family

ControlLogix 5560

Memory for data and logic

2 MB

I/O memory

478 KB

Back-up memory

CompactFlash card (optional, does not come with the controller)

Controller tasks

32 tasks; 100 programs/task; event tasks: all event triggers

Communication ports

1 port, RS-232 serial

Communication options

EtherNet/IP, ControlNet, DeviceNet, Data Highway Plus, Remote I/O, SynchLink, third-party process and device networks

Serial port communication

ASCII; DF1 full/half-duplex; DF1 radio modem; DH-485; Modbus via logic

Controller connections supported, max

250

Network connections, per network module

128 ControlNet (1756-CN2/B); 100 ControlNet (1756-CN2/A); 40 ControlNet (1756-CNB); 256 EtherNet/IP, 128 TCP (1756-EN2x); 128 EtherNet/IP, 64 TCP (1756-ENBT)

Controller redundancy

Full support except for motion applications

Integrated motion

Integrated Motion on the EtherNet/IP network; Sercos interface; analog options: encoder input, LDT input, SSI input

Programming languages

Relay ladder; structured text; function block; sequential function chart (SFC)

Clock support and memory retention at power-down

Battery

Status indicators

Six status indicators

Unconnected buffer defaults

10 (40, max)

Minimum programming software

Series A: RSLogix 5000 version 12.06.00 or later; series B: version 13.04.00 or later

Technical documents (1)

• Rockwell Automation publication 1756-UM001 (ControlLogix 5570 and 5560 controllers)

Key features

• 32 tasks with 100 programs per task
• Relay ladder, structured text, function block and SFC programming
• Battery for clock support and memory retention at power-down
• Optional CompactFlash card for back-up memory
• Full redundancy support except for motion applications

About the Allen-Bradley 1756-L61

The Allen-Bradley 1756-L61 is the ControlLogix 2 MB Memory Controller from the ControlLogix 5560 family, and Rockwell lists its lifecycle status as Discontinued. According to Rockwell Automation publication 1756-UM001, it has 2 MB of memory for data and logic and 478 KB of I/O memory. The same publication gives a maximum of 250 controller connections, 32 tasks and one RS-232 serial port. The minimum programming software is RSLogix 5000 version 12.06.00 or later for series A, and version 13.04.00 or later for series B.

What is the 1756-L61 used for?

The controller runs the control program in a ControlLogix system and can be programmed in relay ladder, structured text, function block or sequential function chart. Rockwell lists communication options of EtherNet/IP, ControlNet, DeviceNet, Data Highway Plus, Remote I/O, SynchLink and third-party process and device networks. The serial port supports ASCII, DF1 full/half-duplex, DF1 radio modem, DH-485 and Modbus via logic, and integrated motion is available on the EtherNet/IP network or through a Sercos interface.

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 module label reads 1756-L61, and note the series letter and firmware revision shown there. Send us a photo of the label so we can confirm the part before you order.