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Search: Posts Made By: bernie_carlton
Forum: LIVE PLC Questions And Answers May 9th, 2020, 11:34 AM
Replies: 31
Views: 1,171
Posted By bernie_carlton
In the first rung you test the value of...

In the first rung you test the value of Test_Seq_1 and in the second rung you test Test_Seq_2. Is it possible for both of theses be equal to 10 on the same scan?
Forum: LIVE PLC Questions And Answers May 6th, 2020, 12:31 AM
Replies: 2
Views: 192
Posted By bernie_carlton
The memory editor is for numeric locations. Both...

The memory editor is for numeric locations. Both of your references are in the control bit (C) area. The ladder logic itself, by highlighting, can show the last saved online value for control bits....
Forum: LIVE PLC Questions And Answers April 29th, 2020, 03:46 PM
Replies: 6
Views: 288
Posted By bernie_carlton
In Modbus RTU there is only 1 master. The CMore...

In Modbus RTU there is only 1 master. The CMore MUST be a master. Possibly add Ethernet?
Forum: LIVE PLC Questions And Answers April 15th, 2020, 10:16 AM
Replies: 4
Views: 278
Posted By bernie_carlton
I'm guessing that at some point it's a BCD/binary...

I'm guessing that at some point it's a BCD/binary mismatch. Also make sure that the following timer or accumulator V word are not being used.
Forum: LIVE PLC Questions And Answers April 7th, 2020, 01:01 PM
Replies: 9
Views: 484
Posted By bernie_carlton
The documentation references 'keyed' connectors...

The documentation references 'keyed' connectors for the attachment cable. Could it be for uniquely keying to prevent cable/module mix-ups?
Forum: LIVE PLC Questions And Answers March 27th, 2020, 10:42 AM
Replies: 5
Views: 346
Posted By bernie_carlton
Some use the Dint as an implied decimal, eg 1234...

Some use the Dint as an implied decimal, eg 1234 actually represents 123.4. Most HMIs can handle displaying the Din't with the single decimal, allow entry of the single decimal and write the times...
Forum: LIVE PLC Questions And Answers March 23rd, 2020, 06:35 PM
Replies: 8
Views: 552
Posted By bernie_carlton
Slightly OT but regarding automatic doors - when...

Slightly OT but regarding automatic doors - when Star Trek began in the late 1960s the US Navy asked about the automatic doors portrayed in the episodes with regard to implementing that on ships. The...
Forum: LIVE PLC Questions And Answers March 22nd, 2020, 03:40 PM
Replies: 2
Views: 257
Posted By bernie_carlton
The software number is 2707-NP but it isn't...

The software number is 2707-NP but it isn't available from AB. It used to be available from Spectrum Controls ( the manufacturer of the unit ) but it it looks like it isn't available from them...
Forum: LIVE PLC Questions And Answers March 18th, 2020, 05:42 PM
Replies: 18
Views: 4,199
Posted By bernie_carlton
I use an analogous method for clearing other...

I use an analogous method for clearing other UDTs, just keep a copy with appropriate initialization values.
Forum: LIVE PLC Questions And Answers March 18th, 2020, 02:56 PM
Replies: 12
Views: 813
Posted By bernie_carlton
MOV with numeric data behaves as expected with...

MOV with numeric data behaves as expected with same type tags. With different type tags it interprets the source to fit the destination type. COP does not do any interpretation and copies the bit...
Forum: LIVE PLC Questions And Answers March 18th, 2020, 09:29 AM
Replies: 18
Views: 1,291
Posted By bernie_carlton
I'm not sure about 'best practice' but I know...

I'm not sure about 'best practice' but I know what worked for me and my co-workers. Each rung of code which solved to a specific output ended in a properly identified bit. These will were gathered,...
Forum: LIVE PLC Questions And Answers March 17th, 2020, 09:38 PM
Replies: 18
Views: 4,199
Posted By bernie_carlton
I always kept an empty string, tag name...

I always kept an empty string, tag name empty_string, and COPyed it to the target - length 1.
Forum: LIVE PLC Questions And Answers March 17th, 2020, 10:52 AM
Replies: 11
Views: 864
Posted By bernie_carlton
Have you considered a retroreflector type sensor...

Have you considered a retroreflector type sensor - assuming all objects are opaque.
Forum: LIVE PLC Questions And Answers March 13th, 2020, 10:37 AM
Replies: 6
Views: 561
Posted By bernie_carlton
I think that you will have to describe the...

I think that you will have to describe the situation better. Is the measured value of the output what you expect? If it is how do determine that an output isn't working?
Forum: LIVE PLC Questions And Answers February 26th, 2020, 10:06 PM
Replies: 12
Views: 1,230
Posted By bernie_carlton
If the program is not referencing the PLC real...

If the program is not referencing the PLC real time clock then syncing to a network source will not help. If the program cannot be accessed then using a UPS is probably the only effective course.
Forum: LIVE PLC Questions And Answers February 26th, 2020, 08:38 PM
Replies: 5
Views: 751
Posted By bernie_carlton
If the project was just uploaded from the PLC...

If the project was just uploaded from the PLC there would be NO labels or comments. They are only in the original source files. The files used by DirectSoft 5 will open fine using DirectSoft 6. Ask...
Forum: LIVE PLC Questions And Answers February 26th, 2020, 10:31 AM
Replies: 10
Views: 731
Posted By bernie_carlton
You missed a rung for the M2 contact otherwise ok.

You missed a rung for the M2 contact otherwise ok.
Forum: LIVE PLC Questions And Answers February 25th, 2020, 01:21 PM
Replies: 10
Views: 731
Posted By bernie_carlton
Assuming your sensors provide distinct on/off...

Assuming your sensors provide distinct on/off states for each seed then standard PLC inputs may be able to read them. Establish a one-shot for each input then use the one-shot of each in 6 separate...
Forum: LIVE PLC Questions And Answers February 19th, 2020, 06:02 PM
Replies: 9
Views: 401
Posted By bernie_carlton
My method for such issues leading zeroes in a...

My method for such issues leading zeroes in a string - is to create a string of the original number. I assume thee original numberis not a float. Make sure to create a string composed of 4 zeroes....
Forum: LIVE PLC Questions And Answers February 18th, 2020, 09:59 AM
Replies: 37
Views: 2,991
Posted By bernie_carlton
Reading back along those chains of discussions...

Reading back along those chains of discussions brings back a lot of memories. Glad I don't have to deal with that now. It was a PITA.
Forum: LIVE PLC Questions And Answers February 14th, 2020, 01:38 PM
Replies: 16
Views: 1,182
Posted By bernie_carlton
Ladder logic Inception!

Ladder logic Inception!
Forum: LIVE PLC Questions And Answers February 8th, 2020, 06:36 PM
Replies: 6
Views: 415
Posted By bernie_carlton
Your scope should be on the negative supply of...

Your scope should be on the negative supply of the 24 volts (COM2) and OUT2 (assuming you are using OUT2). But you aren't showing a COM2 connection in your diagram.
Forum: LIVE PLC Questions And Answers February 3rd, 2020, 03:25 PM
Replies: 22
Views: 1,163
Posted By bernie_carlton
Glad you are making progress. It's hard to...

Glad you are making progress. It's hard to verbally explain a ladder sequence without using some terms specific to a particular platform. One of the interesting things to learn in PLCs is the number...
Forum: LIVE PLC Questions And Answers February 3rd, 2020, 01:51 PM
Replies: 22
Views: 1,163
Posted By bernie_carlton
Create a latch of the contact with the unlatch...

Create a latch of the contact with the unlatch being the timer finished signal. Use the latch to enable the timer. What do you want to do if the contact is still on or has come back on when the timer...
Forum: LIVE PLC Questions And Answers January 27th, 2020, 12:13 AM
Replies: 5
Views: 683
Posted By bernie_carlton
Just a note that the TOT instruction is not...

Just a note that the TOT instruction is not available in Ladder, just Function Block and Structured Text.


Here is a link to the manual containing the description of the instruction,...
Showing results 1 to 25 of 500

 
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