User`s guide

Appendix E Measuring pH with UMC800 Controller and Durafet II Cap Adapter
System Block (ASYS)
264 UMC800 Control Builder Users Guide Release E
1/01
System Block (ASYS)
The system block (ASYS) is used to initiate three functions during a NEWSTART of the controller. (See
Figure 76.)
1. Load a startup recipe (recipe #1) with default variable values for the inputs to the track and hold
blocks in the previous section.
2. Start an off-delay timer for 2 seconds to switches the inputs of the algorithms from the analog inputs
to the variables of the startup recipe.
3. Start an off-delay timer for one second to toggle the track and hold function blocks and capture the
start-up variable values into the track and hold outputs.
Figure 76 ASYS system block