V570 e-mail sending (socket 3 connet does not work)

[Shone]

Hello everyone,

 

I’m trying to send an email via socket 3 and as long as exist connection between PC and PLC (online) LAN, everything works fine, but as soon as I disconnect PC and try to send, SB150 remains 0. Socket 3 not connected. I am making a mistake and would be appreciate if someone can help me with it. Pictures of Ladder are attached.

 

Thank you in advance

[Flex727]

You have several problems here. What is the purpose of MB 146? Do NOT do conditional subroutine calls. It is also very inadvisable to do conditional Socket initializations, especially here where it is completely unnecessary.

Please post your program here. We need to see inside your function blocks to provide any meaningful help.

[Shone]

Hello Flex, Thanx fot the quick answer. MB146, end of the day desperate try to change something... The program is attached.

 

[Annatooli]

One possible problem is in first net where you SET and RESET MB 501. It would be fine this way, if you wont use this bit also in net. 

What happens behind the scenes is - Visilogic stores old value into temporary value  and uses it instead of freshly setted bit itself.  

Try splitting this net in two. 

[Flex727]

On 8/8/2020 at 5:17 PM, Annatooli said:

Try splitting this net in two. 

NEVER place multiple logic threads into a single ladder rung. Separating the logic threads is what the ladder rungs are there for. Sometimes it will work, but without evaluating the compiled code or the STL, you can get unpredictable results.

[stembera]

Maybe I am too late here but nobody noticed risky using of rise edge of MB501 in Rung 1. When MB500 goes on, then MB501 is activated. This is the only case when second line of the Rung 1 is active. In situation when neither (SB146 = 1 and SB151 = 1 and SB146 = 1) nor (SB150 = 1) the MB501 never goes off so the TCP Connect Socket 3 is never called again until power cycle of PLC.