Important news for PAC Control users

Posted by Janice Colmer on Nov 20, 2019 10:03:47 AM

If you are using PAC Control with either SNAP PACs or groov EPIC, please be aware of an urgent bug fix related to how the control engine configures PID loops.

The issue affects:

If you are using PID loops, check your strategy after updating to make sure everything works as you expect. 

600px-Software-update-urgent.svgThe issue has been identified in KB88647:
PID loops configured for Auto mode may start in Manual mode (or vice versa)

Versions affected:

  • SNAP PAC firmware R10.0a - R10.0f
  • groov EPIC (all versions)

If a PAC Control strategy has one or more PID loops configured with Mode set to Auto, when you run the strategy, the PID may start in Manual mode (or vice versa).

Modify the PAC Control strategy and add the Set PID Mode command in the Powerup chart to set the PID loop to the desired mode.


  • Resolved in SNAP PAC firmware version R10.0h
  • Resolved in groov EPIC R1.4.4

Remember, this important fix affects the following controllers: 


UPDATE TO groov EPIC R1.4.4


Topics: Updates, Firmware, PAC Control, groov EPIC, snap pac

Written by Janice Colmer

Janice has worked at Opto 22 for more than 16 years and is part of the marketing team that strives to share new and relevant content with the automation industry. She enjoys books, camping, country music, and spending time with family and friends.
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