1756-L71 Programmable automation controller Has 2 MB of available user memory storage

Manufacturer Rockwell Automation
Series ControlLogix
Integrated motion control • SERCOS interface • Analog options (encoder input, LDT input, SSI input) • Integrated motion control on EtherNet/IP networks
Full support for redundancy
Optional communication adapters • Ethernet /IP • Control network • Device network • Data high-speed plus • Remote I/O • Synchronous links • third-party process and device networks
Built-in communication 1 USB port
The llen-Bradley 1756-L71 is a ControlLogix programmable automation controller. It has 2 MB of available user memory storage and 0.98 MB of I/O memory. It also features an onboard 4-character alphanumeric display for easy monitoring of runtime and module information as well as controller diagnostics. It has an open case and one (1) 2.0 full speed USB port built in. Available communication options include DeviceNet, ControlNet, EtherNet/IP, Remote I/O Data Highway Plus, third-party processes and networks, and SynchLink. It also comes with a 1 GB non-volatile memory, but you can upgrade it to 2 GB with the 1784-SD2. You are advised to leave the SD card in the controller. The 1756-L71 controller comes with three capacitor energy storage modules, two of which are removable. It has a current consumption of 5 mA at 1.2 V DC and 800 mA at 5.1 V DC. The 1756-L71 controller also features a continuous isolation voltage of 30 volts, a maximum power consumption of 2.5 watts, and a heat dissipation of 8.5 BTU/ hour. Its maximum analog I/O, digital I/O and total I/O are 4,000, 128,000 and 128,000, respectively. It has an operating temperature range of 0 to 60 degrees Celsius and a storage temperature range of -40 to 85 degrees Celsius. The maximum ambient air temperature is 60 degrees Celsius, and the non-condensing relative humidity is 5% to 95%. The controller has 500G vibration at 2 to 10 Hz, 30G operating shock and 50G non-operating shock, dropping to 45G with SD card installed. Other controllers may require the user to know the first PLC registers, especially Byte and Bit, in order to begin addressing program elements. With the 1756-L71, users simply plug in a program element and select the logical channel where I/O is physically connected. In other PLCS, users may find it necessary to move one register to another to initiate conversion and processing in order to obtain analog data. The controller only needs the user to find the logical channel where the I/O signal is physically terminated.

The controller is part of the modern Logix controller platform, which is classified as a Programmable Automation Controller (PAC). The PAC product family is well suited for medium to large scale automation requirements and is particularly compatible with the control requirements of the factory and process automation industry.

The 1756-L71 mainly has 2MB of user memory and 0.98 MB of I/O memory. It also comes with a 1784-SD1 secure digital (SD) memory card, equivalent to 1 GB of non-volatile memory, which can be upgraded to 2GB by replacing it with a 1784-SD2 card. The controller can process up to 128,000 discrete input and output signals and 4,000 analog input and output signals.