Hello,

For a valve that has been given an analog command signal in Auto mode via a VlvAnL block and is in motion to that target position, is there a way to set/reset a parameter somewhere in the block to have the valve stop and hold in place, then have it resume motion to the same setpoint again as soon as that parameter is reset/set again? Something like an interlock, but interlock doesn't seem to stop the valve if it is already moving. 

Thanks

Hi User62719,

I'm not exactly sure what do you mean. Do you mean that if the interlock is active the analog setpoint for the valve is changed from the block VlvAnL or did you mean that the setpoint is freezed and but the valve is moving to the setpoint position?

If the valve is moving to the setpoint position then I would add a the SelA02In with:

• In01 = with the setpoint from the block VlvAnL
• In02 = with the feedback of the valve
• Sel_In2 = with the LockAct from the block VlvAnL
  
• Out = is the analog setpoint for the valve

Normally the setpoint comes from the block, but when the interlock is active the setpoint position of the valve is the actual position and the valve doesn't move anymore.

If the setpoint of the block VlvAnL is moving you should check the parameter SafePos of the VlvAnL block. With SafePos = 2 the setpoint for the valve should not move.

With regards
Heisenberg

Hi User62719,

with the SelA02In block you can store a Real-value with a trigger:

• In01 = Out output of this block
• In02 = any Real-value that you want to store
• Sel_In2 = Trigger signal when you want to save the Real-value
  
• Out = to the In01 input of this block and where you want to use the stored Real-value.

So long the signal at Sel_In2 the block use the Real-value from the last cycle. If the signal at Sel_In2 comes true the new signal is processed to the output and stored for the next cycle.

With regards
Heisenberg