Need help programming ladder logic to read input

[ngoc vo]

Hello everyone, 

  I'm writing a program for the PLC to read an input from pymodbus to turn on a button. So far I have succeeded on making the command prompt communicate with the PLC but I don't know how to make it so that the PLC will recognize that signal as a command and turn on the button. Below is the sample ladder logic code I used to set it up, and a screen shot of what command i used in the command prompt.

My apologies before hand for my bad writing. 

ModbusTest2.vlp

[Flex727]

What does "turn on the button" mean? Are you just trying to turn on MB 1 from your PC using MODBUS? If so, you don't need ladder rung 3 in your program at all. Just use MODBUS command #5 or #15 to force MB 1 on. Keep in mind that MB 1 will be MODBUS coil address 2 since Unitronics memory addresses start at zero and MODBUS protocol starts at one.

I'm also going to move your post to a more appropriate forum.

[Flex727]

I see now that it appears you are trying to "unhide" a button on your screen.  When MB 1 is on (or "TRUE"), then the button will be hidden. You have to take out ladder rung 3 before you can manipulate MB 1 from your PC.