Honeywell UDC2500 User Manual

This means that the displayed value of PV, Setpoint, Setpoint2, Remote Setpoint, Input 2, 
Output, Bias, Aux Out, and Deviation will appear on the top display and a prompt 
identifying the value will appear on the bottom display. 

Pressing the 

 key will cycle through all applicable values (configuration 

dependent). One minute after the last press of the display key, the display will revert back 
to a configured default display. The default display is configured in the Input 1 Setup 
Group, and has three selections: 

•  Active Setpoint (SP) 
•  Process Variable (PR Y) 
•  Process Variable with no bottom display prompt (PR n). 

There are three exceptions to the above rules. The displays for PID SET, Timer and 
Setpoint Ramp will appear the same as on a dual display model and, when displaying 
Timer or Ramp values, the default display switchover feature is disabled. 

The single display model is Auto only mode. The Auto/Manual key has no effect on 
controller mode. As a result of this, the failsafe mode is always non-latching.  

While a failsafe condition exists, the controller output will assume the failsafe value. 
When the failsafe condition goes away, normal automatic operation continues.