Multistate Tristate Output commanded by Analog Value (Issue)

[Jim_Okapal]

The tristate output by default has an internal configuration of 1=OFF, 2=ON,

3=-ON.

I noticed that a value of 2 or 3 sent by an analog value will cause the tristate

relays to act as expected to generate the ON and -ON command.  A value

of 1 won't disable both relays.  Instead it activates the ON relay, which is

normally commanded by a value of 2.   If you make the input .99, then both

relays will turn off.  

For analog values coming into the block, it's having the apparent properties of:

0 -.99 = 1 (OFF)

1 - 2.99 = 2 (ON)

3 - 3.99=3 (-ON)

The MSTest multistate value block attached to the analog input as shown in the

picture is demonstrating the proper output as expected for 1,2,3.  

[Will_Workman · Accepted solution]

This is the same behavior that happens within EBO.

It is recommended to create Multistate (integer) outputs from the program and bind that into the Tristate output.  That helps avoid the confusion with decimal values.

The only way I have gotten to make a Tristate output work correctly is to send these as the command values as integer outputs from the program:

-1 = Close

 0 = Hold

 1 = Open