Dear All,

My application is level control with an actuator which accepts only digital output signals, 

So I have:

1- AI: 4-20 mA for level transmitter

2- DO1: To open Valve

3- DO2: To Close Valve

My question is Can the DR 21 makes valve control which

* fully closes it at (say 30% level)

* open it for a constant duty pulse at (say 40% level)

and so on till it fully opened and closes with the same sequence while decreasing the level to the adjusted set point ??

I've read the DR 21 user manual but there were no graphs to describe all modes of operations or selections of configuration switches ( S1 and S2), so any graphs would be appreciated.

Regards;

Ahmed Kadry 

Dear all,

I've found another user manual having some application examples which describe most of the operation modes and after reading them well I've found that my issue could be achieved using DR21, so my question was solved.

I will attach the application example to this reply in order to help any one in configuring DR21.

Regards;

Ahmed Kadry