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1775L2B

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MAIN PROCESS MOD, LEVEL 2

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Technical specifications for 1775L2B

Manufacturer	Rockwell Automation
Brand	Allen-Bradley
Product Lifecycle Status*	Discontinued/Obsolete

* The Allen Bradley 1775L2B has been discontinued by the manufacturer, however we specialize in obsolete parts and can likely still supply surplus and/or refurbished replacement 1775L2B units instead of migration.

Rockwell Disclaimer: The product is used surplus. DO Supply is not an authorized surplus dealer or affiliate for the Manufacturer of this product. The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because DO Supply is not an authorized distributor of this product, the Original Manufacturer's warranty does not apply. While many Allen-Bradley PLC products will have firmware already installed, DO Supply makes no representation as to whether a PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. DO Supply also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from Rockwell, its distributors, or any other source. DO Supply also makes no representations as to your right to install any such firmware on the product. DO Supply will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.

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The 1775L2B is the Main Processor Module from Allen-Bradley/Rockwell Automation. The module is a series B version of the 1775-L2 Main Processor Module. The 1775L2B is used in Programmable Logic Controllers (PLC-3) to assist in memory management and program execution. Since the module uses the level two instruction set, it can only provide supervisory functions which include the timing (ON/OFF delay timer, up/down counter, counter/timer reset, retentive timer, etc), arithmetic (Add, Multiply, Negate, file divide, etc), logical (AND, OR, exclusive OR, complement, etc), and relay methods such as bit on/off, unlatch indexed bit, and the output unlatch. Being the main processor, the 1775L2B should be mounted in the leftmost slot in an Input/Output chassis where it occupies two slots.

As with the 1775-L2, the 1775L2B is powered through the backplane where it draws a current of 9.4 Amps and 40 mA at 5 and 15 Volts DC, respectively. Also, communication with the PLC-3 processor takes place through the backplane. Additionally, the 1775L2B features multiple instruction types, a data table which is flexible (it contains floating point, integer, and high order integer data), a real-time interrupt routine, and LED indicators which show faults and proper functioning. The high-level features of the 1775L2B enable it to provide an efficient program scan time, complete command of program execution, and an easy and a fast way to switch between programs, among others. The memory storage of the 1775L2B Level 2 Series B Main Processor Module is segmented into sections which are dedicated and expandable. This includes a memory section for system status and pointers, module status, data table, messages, and system symbols.