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1772-MJ
Allen Bradley PLC-2 Plug-in Memory Module

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2 year warranty 2 year warranty*

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*Manufacturer's warranty does not apply

PLC-2 Plug-in Memory Module
Description

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Allen Bradley 1772-MJ

AB 1772-MJ is an EEPROM memory module. The EEPROM (Electrically Erasable Programmable Read Only Memory) memory module is a plug-in module that provides Mini-PLC-2/05 Processors (cat. no. 1772-LS, -LSP) with a back-up memory. This 3K non-volatile EEPROM module is an option for these processors.

You can duplicate and transfer processor memory from CMOS RAM to the EEPROM module when the processor is in remote program mode. You can select one of the following three modes that the processor will use to establish its memory when recovering from a power loss. The processor transfers back-up EEPROM automatically to its CMOS RAM, transfers only if its CMOS RAM is invalid, or does not transfer back-up EEPROM.

It is also recommended that you use battery back-up to ensure that data table values are not reset to their initial start-up values after a power loss. Self-contained battery back-up is a feature of Mini-PLC-2/05 processors.

Alternate Memory Storage

You can store an alternate program in an EEPROM module and download the program into processor memory as an alternative to using a Data Cartridge Recorder (cat. no. 1770-SB).

Memory Protection

You can guard against changes to the back-up program, once you have programmed your AB 1772-MJ EEPROM module, by removing a jumper on the module.

Erasing

Every time you duplicate and transfer processor memory to the EEPROM module, new data writes over old. Unused words in processor memory are transferred with zero value, erasing previous memory

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ManufacturerAllen Bradley
RangePLC-2
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