Allen-Bradley 1772-MJ Operation manual

EEPROM Memory Module

Product Data

Allen-Bradley

EEPROM Memory Module

(Cat. No. 1772-MJ)

Product Data

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 (figure 1).

This 3K non-volatile EEPROM module is an option for these processors.

Description

EEPROM Memory Module

Product Data

Figure

Memory Module

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.

We also recommend 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.

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).

You can guard against changes to the back-up program, once you have

programmed your EEPROM module, by removing a jumper on the

module.

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.

Alternate

Memory Storage

Memory Protection

Erasing

EEPROM Memory Module

Product Data

Avoid touching the recessed conductors of the connector. Static charge can

alter memory. Skin oil and dirt can can corrode metallic surfaces,

inhibiting electrical contact.

Insert the EEPROM module into the bottom of the Mini-PLC-2/05

processor using the following steps:

1. Place the processor on a bench top with the battery label up.

2. Hold the EEPROM module with the catalog label up.

3. Slide the EEPROM module into the rectangular opening in the

bottom of the processor, taking care to align the rails on the

EEPROM module with the mating rails in the opening.

4. Gently but firmly push the EEPROM module into the opening until

its bottom flange is flush with the bottom of the processor.

Remove the EEPROM module using the following steps:

CAUTION: Do not remove EEPROM under power.

1. Insert a coin or screwdriver blade into the opening between the

bottom flange of the EEPROM module and the bottom of the

processor.

2. Pry the EEPROM module out far enough to grasp the bottom flange

with your fingers.

3. Carefully remove the EEPROM module.

Handling

the EEPROM

Module

Installation

Removal

EEPROM Memory Module

Product Data

You can duplicate and transfer your ladder diagram program from

processor CMOS RAM to the EEPROM module when the processor is in

remote program mode. Use the following steps:

If you have already inserted the programming plug (jumper) onto your

EEPROM module and installed the EEPROM module in the processor,

skip steps 1 thru 8. Inserting the jumper allows you to program the

EEPROM module, removing the jumper guards against changes after you

have programmed the EEPROM module.

CAUTION: Be sure that you have supported the processor’s

memory using a back-up battery before turning off power to

your processor. Otherwise, you may lose processor memory.

1. You may omit this step if your processor’s memory is supported by

the self-contained lithium battery.

Connect an Auxiliary Battery Pack (cat. no. 1771-BB) to the

processor INTFC port using the Mini-Processor Transport Cable

(cat. no. 1772-CD) to guard against loss of memory when removing

power from the processor.

2. Turn off all power to the 1772-LSP processor and/or to the I/O

chassis Power Supply Module (cat. no. 1771-P3, -P4, -P5).

WARNING: Avoid touching the screw terminals of the power

cable on the lower front of the processor or power supply

module when the power cable is connected to a power source.

Touching an exposed 120V AC conductor can cause a lethal

shock.

3. Remove the power cable from the power source and then from the

Processor (cat. no. 1772-LSP, only).

4. Remove the processor from the I/O chassis and place it on a bench

top, battery label facing up.

5. Holding the back-up EEPROM module with the catalog label up,

insert a programming plug (jumper) on the pair of pins at the upper

right-hand corner.

6. Insert the back-up EEPROM module into the bottom of the processor

(see Installation above). Then, insert the processor into the I/O

chassis.

EEPROM Programming

EEPROM Memory Module

Product Data

7. Connect the power cable to the screw terminals on the processor, then

connect the power cable to the power source.

8. Turn on power to the processor and power supply module.

9. With the processor operating in remote program mode, store any data

table values that you want activated when the processor transfers

EEPROM back-up memory to processor memory. Otherwise, the

transition will occur with start-up data table values.

10. Duplicate and transfer your program to the EEPROM module. The

processor must be in remote program mode. Do this by holding the

processor’s MEMORY STORE switch in the ON position until the

green PROC RUN indicator on the processor turns on. This indicator

turns off after a few seconds.

If, for some reason, the EEPROM module cannot accept the

program, the red PROC FAULT indicator on the processor turns on

and stays on. Reset the fault by cycling power to the processor.

Check that you inserted the programming plug (jumper) on the

EEPROM module. Replace the EEPROM module, if necessary.

11. Remove the programming plug from your EEPROM module to guard

against unauthorized changes. First, remove the processor from the

I/O chassis according to steps 1 thru 4 of the EEPROM programming

procedure. Second, remove the EEPROM module from the processor

using the removal procedure. Remove the programming plug.

12. Using a blank label, identify the contents of your EEPROM module.

13. Re-install the EEPROM module in the processor by following the

installation procedure.

14. Re-install the processor in the I/O chassis and re-connect the power

cable.

Pressing the MEMORY STORE switch has no effect if you haven’t

installed an EEPROM module.

If you have installed an EEPROM module, pressing the MEMORY

STORE switch has no effect when the processor is in remote test or

run/program mode.

MEMORY

ORE Switch

EEPROM Memory Module

Product Data

You can download the program stored in any EEPROM module into

processor memory using the following steps. Refer to installation, removal,

and EEPROM programming procedures for details.

1. Turn off all power to the I/O chassis and processor.

2. Remove the processor from the I/O chassis.

3. Remove the back-up EEPROM module from the processor.

4. Insert the other EEPROM module into the processor.

5. Check that the processor’s back-up lithium battery is installed and its

expiration date has not passed.

6. Set switch 6 of the switch assembly group on the I/O chassis

backplane to the OFF position. This allows the processor to

unconditionally load its memory with EEPROM contents.

7. Insert the processor into the I/O chassis.

8. Turn on power to the 1771-LSP processor, or to the 1771-P3, -P4, -P5

power supply when using the 1772-LS processor.

Program transfer and execution begin immediately.

9. If applicable, set switch 6 of the switch assembly group on the I/O

chassis backplane to its original setting, and/or transfer the new

program to back-up EEPROM.

Use switches 6 and 7 of the switch group assembly on the I/O chassis

backplane to select the mode of memory transfer at power-up.

If Switch 6 Is And Switch 7 Is Then EEPROM Contents

Off

Either position

Off

Always transfers to CMOS RAM.

Does not transfer if CMOS RAM

is valid

Transfers if CMOS RAM is invalid

Never transfers to CMOS RAM

EEPROM Downloading

Backplane Switch Settings

EEPROM Memory Module

Product Data

With offices in major cities worldwide

WORLD

HEADQUARTERS

Allen-Bradley

1201 South Second Street

Milwaukee, WI 53204 USA

Tel: (1) 414 382-2000

Telex: 43 11 016

FAX: (1) 414 382-4444

EUROPE/MIDDLE

EAST/AFRICA

HEADQUARTERS

Allen-Bradley Europe B.V.

Amsterdamseweg 15

1422 AC Uithoorn

The Netherlands

Tel: (31) 2975/43500

Telex: (844) 18042

FAX: (31) 2975/60222

ASIA/PACIFIC

HEADQUARTERS

Allen-Bradley (Hong Kong)

Limited

Room 1006, Block B, Sea

View Estate

28 Watson Road

Hong Kong

Tel: (852) 887-4788

Telex: (780) 64347

FAX: (852) 510-9436

CANADA

HEADQUARTERS

Allen-Bradley Canada

Limited

135 Dundas Street

Cambridge, Ontario N1R

5X1

Canada

Tel: (1) 519 623-1810

FAX: (1) 519 623-8930

LATIN AMERICA

HEADQUARTERS

Allen-Bradley

1201 South Second Street

Milwaukee, WI 53204 USA

Tel: (1) 414 382-2000

Telex: 43 11 016

FAX: (1) 414 382-2400

As a subsidiary of Rockwell International, one of the world’s largest technology

companies — Allen-Bradley meets today’s challenges of industrial automation with over

85 years of practical plant-floor experience. More than 11,000 employees throughout the

world design, manufacture and apply a wide range of control and automation products

and supporting services to help our customers continuously improve quality, productivity

and time to market. These products and services not only control individual machines but

integrate the manufacturing process, while providing access to vital plant floor data that

can be used to support decision-making throughout the enterprise.

Publication 1772-2.22 — August, 1984

Supersedes Publication 1772-936 — August, 1984 PN 955095-94

Printed in USA

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