Allen-Bradley 1772-MJ Operation manual

EEPROM Memory Module
Product Data
1
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
2
Figure 1
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
3
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
4
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
5
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 ST ORE Switch

EEPROM Memory Module
Product Data
6
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
On
On
Either position
On
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
8
With offices in major cities worldwide
WORLD
HEADQUARTERS
Allen-Bradley
1201 South Second Street
Milwaukee, WI 53204 USA
Tel: [phone]
Telex: 43 11 016
FAX: [phone]
EUROPE/MIDDLE
EAST/AFRICA
HEADQUARTERS
Allen-Bradley Europe B.V.
Amsterdamseweg 15
1422 AC Uithoorn
The Netherlands
Tel: [phone]
Telex: (844) 18042
FAX: [phone]
ASIA/PACIFIC
HEADQUARTERS
Allen-Bradley (Hong Kong)
Limited
Room 1006, Block B, Sea
View Estate
28 Watson Road
Hong Kong
Tel: [phone]
Telex: (780) 64347
FAX: [phone]
CANADA
HEADQUARTERS
Allen-Bradley Canada
Limited
135 Dundas Street
Cambridge, Ontario N1R
5X1
Canada
Tel: [phone]
FAX: [phone]
LATIN AMERICA
HEADQUARTERS
Allen-Bradley
1201 South Second Street
Milwaukee, WI 53204 USA
Tel: [phone]
Telex: 43 11 016
FAX: [phone]
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