Allen-Bradley 1756-L74 Programmable Automation Controller (PAC)

The Allen-Bradley 1756-L74 is a Programmable Automation Controller (PAC) that is used for implementing factory and process automation requirements. This controller has a modern design that is specifically catered to meet the requirements of today’s industrial automation requirements.

The 1756-L74 is a single slot width controller, designed with a compact and assembly. It is a chassis-based device that is powered internally by the backplane power distributed to the chassis’ electronic circuitry. This controller is compatible for installation in all of the available chassis made for the ControlLogix system such as 1756-A4, 1756-A4K, 1756-A7, 1756-A7K, 1756-A10, 1756-A10K, 1756-A13, 1756-A13K,1756-A17, 1756-A17 K.

Technical specifications for 1756-L74

ManufacturerRockwell Automation

Maximum Analog I-O4000

Maximum I-O128000

Module TypeProcessor Module

SeriesControlLogix

Part Number/Catalog No.1756-L74

BrandAllen-Bradley

Product TypeProgrammable Automation Controller

Non-volatile memory1GB (ships with the controlelr)

No. of task32

Programs per task100 Programs

Event TaskAll Triggers

Built-in communication1 USB port

Optional Communication adapters? EtherNet/IP ? ControlNet ? DeviceNet ? Data Highway Plus ? Remote I/O ? SynchLink ? Third-party process and device networks

RedundancyFull Support

Integrated Motion? SERCOS interface ? Analog options (encoder input, LDT input, SSI input) ? Integrated Motion on the EtherNet/IP network

I-O Memory0.98 MB

User Memory16 MB

Maximum Digital I-O128,000

Current Draw (1.2 Volts DC)5 milliamps

Current Draw (5.1 Volts)800 milliamps

Power Dissipation2.5 Watts

Thermal Dissipation8.5 BTU per hour

Isolation Voltage30 Volts Continuous

EnclosureNone

The 1756-L74 is an environment-friendly controller, as it utilizes energy storage module instead of batteries for keeping the contents of the Random Access Memory (RAM). Energy storage modules are capacitor based which means RAM memory is retained by the energy stored within the capacitors. These energy storage modules are removable and replaceable. For this controller, a 1756-ESMCAP is pre-installed while other compatible modules include 1756-ESMNSE, 1756-ESMNSEK, 1756-ESMNRM, and 1756-ESMNRMK.

1756-L74

Allen Bradley ControlLogix Processor Module with 0.98 MB I-O Memory

1756-L74K

Allen Bradley ControlLogix Processor Module with 0.98 MB I-O Memory