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Maintenance tech tip

Indirect Addressing - A PLC Programming Tip

Indirect addressing as it relates to PLC programming is the use of a variable for part of a typical PLC address.

Example:  B3:0/[N7:0]

A typical internal (PLC relay) output address for an Allen Bradley PLC would be B3:0/5 and would be described as the 6th bit (output) in word 3.

When you use B3:0/[N7:0] in a rung as an output, the actual B3 bit level address that will be output is dependent on what value is stored in memory location N7:0 at the time the rung was scanned.

If N7:0 has a value of 6 in it, then B3:0/[N7:0] is actually B3:0/6

N7:0 = 13 then 

B3:0/[N7:0] = B3:0/13

So to show how indirect addressing can save a PLC programmer both development time and PLC memory resources, I use the following example.

Say we wanted to activate in sequence, 16 outputs, each for one second, one after the other. Typically that would take 16 rungs and 16 timers as well as conditions for each rung that ties it to the previous.

With indirect addressing, you could do the same with 2-3 rungs and 1 timer. You would start with N7:0 = 0 for B3:0/0 output, then after a 1 second timer, add 1 to N7:0, so now output B3:0/1 is activated.

After timer times up, again add 1 to N7:0 so now B3:0/2 activates, etc. etc. There is a little more to it than this newsletter has room to explain, but you get the basic idea.

As a special offer to our existing customers, we will give you a free copy of our example program BIN95-L531 just for asking. This example SCL500 program has other examples on how to capitalize on the capabilities of the SLC 500 5/03 processor. 

(This free gift to existing customers has sold for $45 and requires RSLogix 500 to view, a SLC 500 if you want to experiment with it and learn even more.)

 

Reader Feedback
Subject: Anti friction bearing Clearance Adjustments
Dear sir ,

Could you provide me some technical literature on " Anti friction bearing Clearance Adjustments " or with some information covering Anti friction bearings in detail .

Regards, Asif

__________________

Dear Asif:

'Anti-friction bearings' are your plain and simple roller bearings.

Yes they may need to be set up with some clearance for growth in hot conditions. As they get hotter the parts expand and the clearances reduce to the right 'hot running' clearance for the bearing. Most roller bearings are made with a range of clearance options to select from to suit shaft diameters, temperatures and loads.

In some situations the bearing is pre-loaded with a force to insure race and rollers are touching. This tends to reduce noise when the bearing is under operating conditions and provide more accurate locating.

The best place to get detailed advice on bearing clearance is from the bearing supplier. They know what clearances to set their bearings to. FAG, SKF, Timken, etc all have detailed catalogues giving much information on setting up bearing clearances.

Best regards, Mike Sondalini


SPECIAL NOTICE: Browse around the website and look for the little Christmas gift icon for savings upto 70% on selected products!

Discount may end before Dec 25th, so buy now. 

(These specials will appear on the website in various places until December 25th)

Featured Articles :

M2M Device Networking article by Marty Huff

Electronic Electricity Repository (EER) by Frank Lincoln



 

World Industry News:

ARCwire for the Week Ending October 29,2004, reaching over 60,000 professionals worldwide.


Archives ...

Up
Vol-14, Lubrication Engineer
Vol 13 - Power Management
Vol-12, Change Management
Vol 10 -Electrical Troubleshooting
Vol-9, PLC Training
Vol-8, Six Sigma
Vol-7, Safety and Reliability
Vol-6 Reliability
Vol-5 Criticality
Vol-4, Human Resources
Vol-3, PLC Programs
Vol-2, managing people
Vol- 1, maintenance advice

Click Newsletter to return to current news letter.

 

Back ] Up ] Next ]

Volume 13:

Welcome: 

Please select "subscribe to newsletter" on our contact form.

Topic: Electric Power

Welcome to the 13th issue of our Feed Forward Newsletter; "The Maintenance War Newsletter". This first area of the newsletter is for introductions and commentary. Remember,  the website has many new items added each month. So please browse around and find yourself a gold nugget. 

Online version at  www.feedforward.com.au

Since our last issue we have started to deliver Palm / PDA software products and power point presentation products. We started out with one new product for each new media type. We are actively working on developing and finding you more of those type products. 

Be sure to download the free trial Electronic and Electrical Calculator Palm Software. Our first power point to offer is titled "Maintenance Management Guide".

Our newest Ebook title is by Larry Bush. Be sure to browse the free samples of his Ebook, "How to Purchase, Setup and Maintain Emergency Diesel Electric Generators"

emergency power generator book

We have also added a couple new Computer Based Training (CBT) CDs. If you have experienced our  award winning PLC Training CBT, you will want to see our new Control Logix CBT. We have also recently added a Measurement Methods CBT.

Also the very detailed M2M Device Networking article by Marty Huff is new on the site.

 

The  article is about how the ability to extract raw data from a device, machine, or appliance, and convert that data into useful information, transforms the decision-making from an art to a science.

 

In the last issue of "The Maintenance War Newsletter", we started an initiative dubbed "Change the world". One submitted article stands out as being in line with the initiative's goals.

 

Frank Lincoln donated the white paper "Electronic Electricity Repository (EER)", about a new approach to storing electricity. While we are not validating his theories by publishing them, our hat is off to Frank for his thought provoking article and his intentions to make the world we live in a better place to live.

 

You never know, Frank's article may spawn the next invention to make our appliances even smaller and consume less energy. :>)

 


Management Help: Indirect labor hours

One reader asks: "What's the best possible way to reduce cost when direct labor hours utilized are far less then the indirect labor hours"?

From the limited information I would speculate your area of greatest cost savings would be to focus on reduction of the support personnel’s hours.

This would consist of incorporating many lean methodologies to the areas of their responsibility. An example would be the task of changing light bulbs in the facility. Typically, a light bulb burns out, someone is called to change it. A lean analysis of the task at hand goes something like this...

  • A phone call to maintenance.
  • A work order generated.
  • The task is scheduled.
  • A person gets the ladder out and a light bulb from stock.
  • A person changes it.
  • A person puts back the ladder
  • The work order is updated and closed.

The above seven items equals the man-hours to change a light bulb. The larger the facility, the more a scenario occurs where the maintenance person returns to the same general area again in that week to replace another light bulb. It has been proven in large office buildings that a huge savings in man hours can be seen by changing all light bulbs in a given area at one time whether they are burnt out or not. (You save the time it takes for 6 of the 7 steps above, multiplied by the amount of light bulbs in that room. Then multiply that savings multiplied by the amount of rooms responsible for maintaining to see an annual savings.)

Basically light bulbs of the same model number will all last the same amount of hours. Therefore if you change them all in a room at the same time, when one burns out the next time, it will be time to change them all out as the others are soon to burn out.

This is just one of thousands of lean ideas that can be applied to reduce support man hours. If you are using a work order/CMMS system, you may be able to identify the areas of greatest cost and focus on them first with lean ideas.

Hope this helps


Human Resource:

Let's Talk Human Resource

 Below are some great resources to exchange ideas with your fellow maintenance managers. Swap ideas with others, now that is a human resource that isn't used enough. (Sites that were email only have been excluded.) 

Also we would be grateful to hear your ideas on how the maintenance manager can better utilize their company's human resource department. Email us your thoughts and we may use it for the next newsletter. 

The Toast Forum at Idcon - over 100 topics, over 300 registered members. On the Maintenance and Reliability Discussion Forum, the general maintenance management section topic and the Computerized Maintenance Management Systems (CMMS) topic are the most popular.

Reliability Magazine® Message Boards  - over 5000 topics, over 60,000 posts, leans more towards the mechanics of managing a maintenance department with the hot topic being the Alignment/Balancing/Vibration Forum

MaintenanceForums.com - almost a 100 topics, over 700 registered members. Their most popular topic is the Machinery Condition Monitoring and Predictive Maintenance topic.

Even industry specific forums can surprise you with a wealth of information and peers to network with. Take Saferpak Discussion Forums for example, over 3000 posts,  and 541 registered members. Their focus is the Food [Packaging] Safety, Quality Management & Business Improvement topic discussions.

Yahoo groups.

Science > Engineering > Industrial 

Google news groups.

sci.engr.manufacturing
sci.engr

 


The World Wide Web:

Below are some websites I recommend you see ... 

Mega-zine - active ezines accessible via the WEB and E-mail.

Aerostrip Australia - national distributor for a range of environmentally friendly products.

Insider Secrets to Hydraulics - trouble shooting on hydraulic pumps


Best regards and thanks for being a subscriber to this newsletter,

Don Fitchett
Managing Editor
Feed Forward Publications
http://www.feedforward.com.au
Tel : (573) 547-5630

www.feedforward.com.au teaches your maintenance crew engineering and asset care knowledge so that they can solve more problems, become more knowledgeable, make better decisions and your plant runs more reliably!

Please select "subscribe to newsletter" on our contact form.

Volume 13:

Welcome: 

Please select "subscribe to newsletter" on our contact form.

Topic: Electric Power

Welcome to the 13th issue of our Feed Forward Newsletter; "The Maintenance War Newsletter". This first area of the newsletter is for introductions and commentary. Remember,  the website has many new items added each month. So please browse around and find yourself a gold nugget. 

Online version at  www.feedforward.com.au

Since our last issue we have started to deliver Palm / PDA software products and power point presentation products. We started out with one new product for each new media type. We are actively working on developing and finding you more of those type products. 

Be sure to download the free trial Electronic and Electrical Calculator Palm Software. Our first power point to offer is titled "Maintenance Management Guide".

Our newest Ebook title is by Larry Bush. Be sure to browse the free samples of his Ebook, "How to Purchase, Setup and Maintain Emergency Diesel Electric Generators"

emergency power generator book

We have also added a couple new Computer Based Training (CBT) CDs. If you have experienced our  award winning PLC Training CBT, you will want to see our new Control Logix CBT. We have also recently added a Measurement Methods CBT.

Also the very detailed M2M Device Networking article by Marty Huff is new on the site.

 

The  article is about how the ability to extract raw data from a device, machine, or appliance, and convert that data into useful information, transforms the decision-making from an art to a science.

 

In the last issue of "The Maintenance War Newsletter", we started an initiative dubbed "Change the world". One submitted article stands out as being in line with the initiative's goals.

 

Frank Lincoln donated the white paper "Electronic Electricity Repository (EER)", about a new approach to storing electricity. While we are not validating his theories by publishing them, our hat is off to Frank for his thought provoking article and his intentions to make the world we live in a better place to live.

 

You never know, Frank's article may spawn the next invention to make our appliances even smaller and consume less energy. :>)

 


Management Help: Indirect labor hours

One reader asks: "What's the best possible way to reduce cost when direct labor hours utilized are far less then the indirect labor hours"?

From the limited information I would speculate your area of greatest cost savings would be to focus on reduction of the support personnel’s hours.

This would consist of incorporating many lean methodologies to the areas of their responsibility. An example would be the task of changing light bulbs in the facility. Typically, a light bulb burns out, someone is called to change it. A lean analysis of the task at hand goes something like this...

  • A phone call to maintenance.
  • A work order generated.
  • The task is scheduled.
  • A person gets the ladder out and a light bulb from stock.
  • A person changes it.
  • A person puts back the ladder
  • The work order is updated and closed.

The above seven items equals the man-hours to change a light bulb. The larger the facility, the more a scenario occurs where the maintenance person returns to the same general area again in that week to replace another light bulb. It has been proven in large office buildings that a huge savings in man hours can be seen by changing all light bulbs in a given area at one time whether they are burnt out or not. (You save the time it takes for 6 of the 7 steps above, multiplied by the amount of light bulbs in that room. Then multiply that savings multiplied by the amount of rooms responsible for maintaining to see an annual savings.)

Basically light bulbs of the same model number will all last the same amount of hours. Therefore if you change them all in a room at the same time, when one burns out the next time, it will be time to change them all out as the others are soon to burn out.

This is just one of thousands of lean ideas that can be applied to reduce support man hours. If you are using a work order/CMMS system, you may be able to identify the areas of greatest cost and focus on them first with lean ideas.

Hope this helps


Human Resource:

Let's Talk Human Resource

 Below are some great resources to exchange ideas with your fellow maintenance managers. Swap ideas with others, now that is a human resource that isn't used enough. (Sites that were email only have been excluded.) 

Also we would be grateful to hear your ideas on how the maintenance manager can better utilize their company's human resource department. Email us your thoughts and we may use it for the next newsletter. 

The Toast Forum at Idcon - over 100 topics, over 300 registered members. On the Maintenance and Reliability Discussion Forum, the general maintenance management section topic and the Computerized Maintenance Management Systems (CMMS) topic are the most popular.

Reliability Magazine® Message Boards  - over 5000 topics, over 60,000 posts, leans more towards the mechanics of managing a maintenance department with the hot topic being the Alignment/Balancing/Vibration Forum

MaintenanceForums.com - almost a 100 topics, over 700 registered members. Their most popular topic is the Machinery Condition Monitoring and Predictive Maintenance topic.

Even industry specific forums can surprise you with a wealth of information and peers to network with. Take Saferpak Discussion Forums for example, over 3000 posts,  and 541 registered members. Their focus is the Food [Packaging] Safety, Quality Management & Business Improvement topic discussions.

Yahoo groups.

Science > Engineering > Industrial 

Google news groups.

sci.engr.manufacturing
sci.engr

 


The World Wide Web:

Below are some websites I recommend you see ... 

Mega-zine - active ezines accessible via the WEB and E-mail.

Aerostrip Australia - national distributor for a range of environmentally friendly products.

Insider Secrets to Hydraulics - trouble shooting on hydraulic pumps


Best regards and thanks for being a subscriber to this newsletter,

Don Fitchett
Managing Editor
Feed Forward Publications
http://www.feedforward.com.au
Tel : (573) 547-5630

www.feedforward.com.au teaches your maintenance crew engineering and asset care knowledge so that they can solve more problems, become more knowledgeable, make better decisions and your plant runs more reliably!

Please select "subscribe to newsletter" on our contact form.

Maintenance tech tip

Indirect Addressing - A PLC Programming Tip

Indirect addressing as it relates to PLC programming is the use of a variable for part of a typical PLC address.

Example:  B3:0/[N7:0]

A typical internal (PLC relay) output address for an Allen Bradley PLC would be B3:0/5 and would be described as the 6th bit (output) in word 3.

When you use B3:0/[N7:0] in a rung as an output, the actual B3 bit level address that will be output is dependent on what value is stored in memory location N7:0 at the time the rung was scanned.

If N7:0 has a value of 6 in it, then B3:0/[N7:0] is actually B3:0/6

N7:0 = 13 then 

B3:0/[N7:0] = B3:0/13

So to show how indirect addressing can save a PLC programmer both development time and PLC memory resources, I use the following example.

Say we wanted to activate in sequence, 16 outputs, each for one second, one after the other. Typically that would take 16 rungs and 16 timers as well as conditions for each rung that ties it to the previous.

With indirect addressing, you could do the same with 2-3 rungs and 1 timer. You would start with N7:0 = 0 for B3:0/0 output, then after a 1 second timer, add 1 to N7:0, so now output B3:0/1 is activated.

After timer times up, again add 1 to N7:0 so now B3:0/2 activates, etc. etc. There is a little more to it than this newsletter has room to explain, but you get the basic idea.

As a special offer to our existing customers, we will give you a free copy of our example program BIN95-L531 just for asking. This example SCL500 program has other examples on how to capitalize on the capabilities of the SLC 500 5/03 processor. 

(This free gift to existing customers has sold for $45 and requires RSLogix 500 to view, a SLC 500 if you want to experiment with it and learn even more.)

 

Reader Feedback
Subject: Anti friction bearing Clearance Adjustments
Dear sir ,

Could you provide me some technical literature on " Anti friction bearing Clearance Adjustments " or with some information covering Anti friction bearings in detail .

Regards, Asif

__________________

Dear Asif:

'Anti-friction bearings' are your plain and simple roller bearings.

Yes they may need to be set up with some clearance for growth in hot conditions. As they get hotter the parts expand and the clearances reduce to the right 'hot running' clearance for the bearing. Most roller bearings are made with a range of clearance options to select from to suit shaft diameters, temperatures and loads.

In some situations the bearing is pre-loaded with a force to insure race and rollers are touching. This tends to reduce noise when the bearing is under operating conditions and provide more accurate locating.

The best place to get detailed advice on bearing clearance is from the bearing supplier. They know what clearances to set their bearings to. FAG, SKF, Timken, etc all have detailed catalogues giving much information on setting up bearing clearances.

Best regards, Mike Sondalini


SPECIAL NOTICE: Browse around the website and look for the little Christmas gift icon for savings upto 70% on selected products!

Discount may end before Dec 25th, so buy now. 

(These specials will appear on the website in various places until December 25th)

Featured Articles :

M2M Device Networking article by Marty Huff

Electronic Electricity Repository (EER) by Frank Lincoln



 

World Industry News:

ARCwire for the Week Ending October 29,2004, reaching over 60,000 professionals worldwide.


Archives ...

Up
Vol-14, Lubrication Engineer
Vol 13 - Power Management
Vol-12, Change Management
Vol 10 -Electrical Troubleshooting
Vol-9, PLC Training
Vol-8, Six Sigma
Vol-7, Safety and Reliability
Vol-6 Reliability
Vol-5 Criticality
Vol-4, Human Resources
Vol-3, PLC Programs
Vol-2, managing people
Vol- 1, maintenance advice

Click Newsletter to return to current news letter.

 

Back ] Up ] Next ]

Viewers understands that any content or other information offered on or through FeedForward.com.au is provided for informational purposes only. Viewers should evaluate any content or other information offered on or through FeedForward.com.au in light of viewer's own individual circumstances. © 2016 Feed Forward - A subsidiary of Business Industrial Network