Changing thresholds through HMI

Good afternoon,

As you can see in the picture, I have three analog functions: SF014, SF017 and SF018. 

SF014 has two threshold values: OFF (VW4) and ON (VW6). I can change these values through I/O fields in the HMI (Inferior Limit, VW4, and Superior Limit, VW6).

I want the ON limits of SF017 and SF018 to be VW4 and VW6, respectively, so I gave them the same address in LOGO. So far, so good, I can change these values through the HMI.

The OFF limits of SF017 and SF018 are VW8 and VW10, and I want to define these limits the following way:

VW8 = OFF (SF017) = ON (SF017) - 1 = OFF (SF014) - 1 = VW4 - 1

VW10 = OFF (SF018) = ON (SF018) - 1 = ON (SF014) - 1 = VW6 - 1

The picture provided has an example (ON = 40, OFF = 39, but I want the function OFF = ON - 1). 

How do I configure the OFF values of the analog functions (without creating additional I/O fields) so that OFF = ON - 1?

You have been of great help, many thanks again!

One more question, if I want the "70-1" and "40-1" values on the HMI (AM1 and AM2), how do I represent their address on the HMI? VM0 and VM2? Or something else?

Thanks in advance!

Understood, it worked, thank you. Last question: I have two LOGOs connected to my HMI. Let's call them LOGO 1 and LOGO 2.

When I insert the values of VW4 and VW6 on the HMI, I receive those values on LOGO 1. I only have 2 I/O fields.

How do I send the VW4 and VW6 values to LOGO 2 without adding more I/O fields? What I've done as shown on the picture doesn't work as desired, as I need to insert the same value two or three times for it to work.

I've made the connection, but the information isn't reaching the second LOGO. And I need to transfer information between both LOGOS when the computer will be disconnected from the switch.

Any idea on what might be wrong?