PanelView Plus maintained pushbutton issue

smcmanus

Member
Join Date
Jan 2006
Location
Vancouver
Posts
109
I am using RSView Studio and have 2 different PanelView's on the same network that use the same tag address for a Maintained Pushbutton to control the same machine. Problem is on PanelView #1 when I hit the maintained pushbutton that I cannot unlatch the same button from PanelView #2. Appreciate your help.
 
It's possible that the Panelviews are keeping a local copy of the state and acting according to that. It may be better to create a toggle structure in the PLC itself then change the buttons on the screen to momentary and let their actuation perform the toggle.
 
Bernie's answer is the best, generic solution to that problem, no matter what HMI you are using.

With PV+/ME/SE, other solutions involve using a multi-state PB, make sure you set an indicator tag (even if it is the same as the control tag), and make sure the mode is set to "Next state is based on current state".
 
Absolutely Bernie has the right answer. All my recent projects use the same technique because:

1. The state of the button is stored in the PLC, not the HMI. This always seemed to me a more secure approach.

2. Multiple HMI devices can readily "edge trigger" the same button without the need to arbitrate who is in control. Done this way the button always responds to the last command regardless of who issued it.
 

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