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.
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.
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