[Guadalajara / Jalisco MX Area?]

 ¿Algún programador de unitronics en jalisco/guadalajara?  Necesito varios programadores para empleo a tiempo completo. Las habilidades de desarrollo web completo también serían útiles.

Any Unitronics Vision programmers in Guadalajara or greater Jalisco MX area?

I would like to find 2-3 devs for a permanent full time position,  web dev experience and English skills are a plus.

[PLC Hacking - More Commonplace Than You Might Think]

24 minutes ago, Flex727 said:

It's actually the exact opposite. The router is set to forward port 20256 from their public IP address (WAN) to their to their private IP address (LAN). This is actually fairly common, and while it's not secure, it's generally okay because there is little incentive (profit motive) to hack in these situations. Tensions in the ME provided the incentive absent a profit motive.

It's a good lesson learned here - avoid using default settings.

Please forgive my oversimplification of the issue.  I've been awake since early Thanksgiving morning trying to get wells back online that were affected by this hack lol.

[PLC Hacking - More Commonplace Than You Might Think]

Anyone affected by this hack had port 20256 forwarded to their public IP. 

It's literally because the programming port is forwarded to the internet,  doesn't even really qualify as a hack.  If you get hit by this you should fire your networking guy.

[V700 Modbus TCP]

I have also noticed that the SB's associated with Ethernet state (not relevant for V700).  Have these status registers moved?

[V350-J-TR20 >>> Modbus communication with 2 VFDs]

I would also suggest using a #6 "Preset Holding Register" function block instead of the #16 "Preset Holding Registers" function block as your vector length appears to be one.  This can cause issue with some slave devices.  You might have better luck if you lower your baud rate to mitigate any problems electrical noise (that VFDs are notorious for) might be causing, as well as making sure you are using shielded cable that is grounded on one end only.

[Handheld model]

I would consider remote mounting the PLC and using a tablet to remote control it, either using VNC with the Uni product line or Modbus/TCP with the Vision product line.

[Ethernet/Cellular Commnication & iOS App]

What benefits have you seen using the application on the mobile device and collecting the data over Modbus/TCP versus just using the webserver on the ethernet card and a browser on the mobile device?

[Modbus TCP/IP V570 (Example)]

It is fairly simple.  Connect your sockets, scan on the slave device and poll on the master device.  As usual with Modbus, to talk to many devices you will have to convert your MBs to integers using the BIT->INT FB.