Masked Move RSLogix 5000

[Leigh.edler]

So I'm using a 1769-L35E. I'm trying to move two INTS through Masked Move Instructions to create a DINT together. I'm fairly new to this so forgive me for being Noobish. I'm just having trouble figuring out what the mask should be. Do you think somebody could explain this to me? The help description in RSL is just kind of confusing. Thanks in advance.

 

[bernie_carlton]

If the two source INTs are adjacent members of an array or UDT then use the COP command. Let's say the twos INTs are the first two elements of an arrya - MyInt[]. We will copy them to a single DINT - MyDint

COP
MyInt[0]
MyDint
1

This should put MyInt[0] into the lower 16 bits of MyDint and MyInt[1] will go to the upper 16 bits of MyDint.

 

[Leigh.edler]

So i just tried that. Whats happening is Myint[0] is showing up fine in the DINT. But MyInt[1] keeps coming out as 32768. How do i fix this?

 

[Leigh.edler]

I just put decimal value 3300 into myint[1] and a decimal value of 4 into myint[0] and the value that was put into mydint is 216268804

 

[bernie_carlton]

That looks right. 3300 = CE4 hex. 4 = 4 hex.
So the resultant DINT should be CE40004 hex or 216268804 decimal.

Is that not what you were expecting? If not what were you expecting?

 

[Leigh.edler]

Well i'm using this to read the numbers off of an RFID card. So lets say the number on the card is 3300039. But I have to make that number with two INTS.

 

[bernie_carlton]

Can you explain the whole system?

How is the number being received from the RFID card - as two INTs? If so what does the number look like in the two INTs? What end result do you want?

Please note if you are showing the number as decimal or hexadecimal.

 

[Leigh.edler]

I'm showing the numbers as a decimal. The two ints also come in as decimal. The end numbers will be between 3300004 and 3300044. Because the interface block won't write data in DINTS, I have to figure out a way to write it with two INTS and convert those INTS into a single DINT between 3300004 and 3300044. Forgive me if this is confusing I havent been doing this very long.

 

[Donnchadh]

Hi

The btd instruction would but the int into the upper part of a dint for you.
You Could also move the int into a dint then use the swap instruction to move that int to the upper half of the dint and then use the Mvm to move the second int into the lower word of the dint.
Now sometimes you have to swap the bytes in each int word first normally if the unit has been set up to talk to a Siemens plc. But as Bernie said just give so more details on part numbers, network type etc

Donnchadh

 

[bernie_carlton]

You told us what you want but not what you have to start with.

Are the two INTs '33' and '4' for your example 1 and '33' and '44' for your example 2?

If so you want (first INT * 1000000) + second INT. Use a CPT instruction with the destination being the DINT.

But if the first INT is ALWAYS '33' then just ignore it and add 33000000 to your second INT.

 

[Leigh.edler]

The first int is always in fact 33. Let me give that a try and we'll see how it works out. Thank you guys!

 

[Leigh.edler]

I got it to work. Thank you guys for all your help. I have one last question. The time in my PLC is on eastern time. How would I get it to sync with the time from my computer?

 

[dmroeder]

Go to Controller Properties, date/time tab, click set date time and zone from workstation.

 

[Leigh.edler]

Boom! Easy enough! Thanks dmroeder!

 

[Ken Roach]

The internal "Wall Clock" of the ControlLogix has two important attributes: DateTime and LocalDateTime.

The "Local" DateTime is derived from the ordinary DateTime by applying the Time Zone and Daylight Saving settings.

The idea is that you can have universal timestamps on all your controllers that stay consistent no matter where they are located, and still also have timestamps or displays that match what the operators are going to see on their wristwatches.