Ryan_Flowers
Lifetime Supporting Member
Hello,
I have a piece of a equipment that has a Panel View 800 (2711R-T4T) HMI, Micrologix 1400 (series B), and some physical control buttons.
The physical buttons and switches are in the wrong orientation for the operator to operate in most cases so I installed the PV 800 in a more operator friendly location for them to control the equipment. I have used the Current Screen Number Global Connection in the HMI to tell the PLC which screen is active. What I wanted to do is that if the HMI loses power or it's program is unloaded it would place a 0 in that global connection value and the operator can still use the physical switches. There are a couple 3 position switches that make it hard to run in parallel in my ladder logic.
Can someone help me find a way to notify my PLC that my HMI is powered off and the program is unloaded?
Thanks!
I have a piece of a equipment that has a Panel View 800 (2711R-T4T) HMI, Micrologix 1400 (series B), and some physical control buttons.
The physical buttons and switches are in the wrong orientation for the operator to operate in most cases so I installed the PV 800 in a more operator friendly location for them to control the equipment. I have used the Current Screen Number Global Connection in the HMI to tell the PLC which screen is active. What I wanted to do is that if the HMI loses power or it's program is unloaded it would place a 0 in that global connection value and the operator can still use the physical switches. There are a couple 3 position switches that make it hard to run in parallel in my ladder logic.
Can someone help me find a way to notify my PLC that my HMI is powered off and the program is unloaded?
Thanks!