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Putting a Comparator instruction in parallel with a contact in Machine Expert HVAC Ladder

Industry Automation and Control Forum

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TimK
Crewman
Crewman
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470

Putting a Comparator instruction in parallel with a contact in Machine Expert HVAC Ladder

I'm fairly new to the world of Schneider PLCs and just wanted to put a Greater Than comparator in parallel with a normally open contact in Ladder logic like this.

 

 
 

GT and Contact in parallel.PNG

 

 

 

But Machine Expert - HVAC doesn't seem to want to let me do that by directly dragging and dropping from the Operators and Blocks window and I can't seem to put a parallel branch around the comparator to add the contact.

 

Has any one come across this? What am I doing wrong?  🙄

3 Replies 3
Bastian_Schmitz
Commander Commander
Commander
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444

Re: Putting a Comparator instruction in parallel with a contact in Machine Expert HVAC Ladder

Hello TimK,

The Ladder editor in the Software are not the strongest available language.

I agree with you and see also no way to built directly the strucutre which you have in the other software.

But you could reach your goal in different other ways. 

 

1. You could split it into 2 Networks

ladder1.PNG

 

2. Or you could use an expression instead the GT block together with an OR block

ladder2.PNG

If you would convert a projekt from a Codesys based software to EcoStruxure Machine Expert HVAC you have also the oppurtunity to use the PLCOPenxml exchange. Normally you could export all your POU,FB,FC into an XML File. 

Later you could import them in EcoStruxure Machine Expert HVAC.

ladder3.PNG

make a right mouseclick on top of the project table and choose import.

ladder4.PNG

Select as format PLCOpen XML.

In this way you could import Ladder and Structure text POU,FB,FC.

 

In general I would advise you to use the FBD editor. This editor is much more powerfull then den LD Editor. 

In my personal opinion he is stronger like the version in codesys based solutions.

 

best regards

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TimK
Crewman
Crewman
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1
438

Re: Putting a Comparator instruction in parallel with a contact in Machine Expert HVAC Ladder

Thank you for taking the time to clarify Bastian, I figured that the only way would be to "go around the houses" (split logic etc.) rather than take the unavailable straight route.

 

The project that I'm converting is actually built with SoMachine 4.3 with M251 and M221 processors as the target CPU's.

 

The reason for the conversion is the withdrawal of the M221 due to problems with its current CPU chipset. We have chosen an M172 PLC as a replacement, developed with Machine Expert - HVAC.

 

I like the idea of using PLCopen XML to convert code but I don't think SoMachine 4.3 can export to this file type. The last time I did an export, the code was saved as four .smbp files.

 

Many Thanks

Tags (1)
Bastian_Schmitz
Commander Commander
Commander

Re: Putting a Comparator instruction in parallel with a contact in Machine Expert HVAC Ladder

In Ecostruxure Machine Expert you could export to PLCopen XML I think that should also possible with somachine 4.3.

Here is a presentation to this Topic.

Convert Codesys3 to Ecostruxure Machine Expert HVAC 

 

best regards

 

 

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