User`s guide

Appendix A - Logic Application Examples
Loop and Logic Integration
Release E UMC800 Control Builder User’s Guide 235
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Loop and Logic Integration
Example 1 - Loop and logic integration
This alters Logic Example 3 to include interaction with statuses
from the control loop and SP programmer events. These are
shown as Signal Tags (loop auto status and event 2) with
associated connectors to the AND block inputs. This is
equivalent to direct soft wire connection.
LS 1 LS 2
PB1
Pump B
SPP1
EV2 On
ZN1 in
Auto
PS1
PS2
SOL1
LAMP 2
Example 2 - Loop and logic integration
In this application, the base requirement is control off of the lowest of three thermocouples (a high fail-safe
would be selected for T/C burnout for each analog input block) and provide a 4-20 mA output to a valve. If the
lowest input is less than 125 Deg F, and the control output is greater than 100 % for 10 minutes, turn On
Solenoid valve 4 to obtain more heat for the process.