PanelView and PLCs inputs

[HiPo]

Hello,

I am working with a PLC MicroLogic 1500.
I used a mechanical switch (ON/OFF) to start/stop measurements by using Input I:0/0. It works fine.

Now I am using a C300 PanelView and will replace that switch with Function keys:
F2 = start measurements and F3 = stop measurements
Both F2 and F3 are Maintained Push buttons.

Tags: InputA: Boolean, address: I:0/0
Connections: Write Tag: Input A and Indicator Tag: InputA
How can I set 1 to I:0/0 by pressing F2 and set 0 to I:0/0 by pressing F3?

Best Regards

 

[Steve Bailey]

I don't believe you can. While your PanelView may be able to write to that bit, the normal I/O service will quickly overwrite it with the status of the input terminal.

Better to have the PanelView write to a B3 bit and put an XIC instruction addressed to that bit in parallel with the current XIC usage of I:0/0.

 

[Aabeck]

What I do in this situation is have the HMI set 2 bits - 1 to bypass the input switch & the other to disable the input switch. You will have to change the HMI PB's to Momentary Set type, or modify the below ladder to compensate for maintained bits.

 

[HiPo]

Hello Steve,

Thanks for your suggestion. The PanelViews buttons work fine.