Opto 22 - Resources & Tools

G4IDC5Q may occupy only one module position after regenerating reference counts in PAC Control

Knowledge Base - KB53137 - 7/30/2026

After regenerating reference counts (Tools > Regenerate Reference Counts) in PAC Control, a G4IDC5Q module pair may appear to only occupy one position in the Configure I/O Modules and Points dialog...more

Reading string data from a microSD card in a SNAP-PAC-R1 (GEN2) to a string table may be extremely slow

Knowledge Base - KB91373 - 6/26/2026

Reading string data from a microSD card in a SNAP-PAC-R1 (GEN2) controller to a string table may be extremely slow.

Some SNAP analog input modules report only -32768 or NaN to B3000-series brains

Knowledge Base - KB91493 - 6/17/2026

“Fragnesia” Vulnerability in groov EPIC and RIO

Knowledge Base - KB91515 - 6/15/2026

The “Fragnesia” vulnerability—a local privilege escalation vulnerability—could be exploited by an attacker to obtain unauthorized administrative (or root-level) privileges to your...more

PAC Control strategy commands Calculate & Set Analog Offset and Calculate & Set Analog Gain return 0.0 for groov I/O or groov RIO channels

Knowledge Base - KB91448 - 6/3/2026

When calibrating analog channels on groov I/O or groov RIO modules using the PAC Control strategy Calculate & Set Analog Offset and Calculate & Set Analog Gain commands, the commands return a value of 0.0 instead of the required value.

Inspecting a communication handle variable in PAC Control Debug mode may cause a timeout error for SNAP PAC controllers and groov EPIC processors

Knowledge Base - KB86871 - 6/3/2026

When inspecting a communication handle variable in PAC Control Debug mode or any other program, you may encounter a communication timeout error with a SNAP PAC controller or groov EPIC processor running the PAC Control Engine.

GetNumCharsWaiting command with a file communication handle returns incorrect values

Knowledge Base - KB91070 - 6/3/2026

If a chart running on a SNAP-PAC-R1 (GEN2) runs the Get Number of Characters Waiting (GetNumCharsWaiting in OptoScript) command with a file communication handle, the command may incorrectly return 0 or differing (incorrect) values.

Incorrect values returned by commands that retrieve available file space on a micro SD card

Knowledge Base - KB91043 - 6/3/2026

If you request the available file space on a micro SD card through either of the two Get Available File Space PAC Control commands, the value is incorrect.

If chart calls subroutine multiple times with NULL pointer as a parameter, controller may reset

Knowledge Base - KB90966 - 6/3/2026

If a chart calls a subroutine multiple times with a NULL pointer as a parameter, the controller may reset.

Multiple UDP connection attempts with invalid connect strings may reset SNAP PAC controller

Knowledge Base - KB91425 - 6/3/2026

If a strategy uses the Open Outgoing Communication command multiple times with improperly formatted UDP connect strings, the affected controller may reset.

Writing data from a SNAP PAC controller using an FTP communication handle results in an empty destination file

Knowledge Base - KB91391 - 6/3/2026

Writing data from a SNAP PAC controller to a new destination file using an FTP communication handle may result in an empty file.

SNAP analog points converted to G1 analog points after import through PAC Manager

Knowledge Base - KB91370 - 6/3/2026

If you used PAC Manager's Import/Copy I/O Unit Image feature to create a new I/O unit from an existing SNAP PAC I/O unit configuration, PAC Manager may converts any SNAP PAC analog modules to G1 analog modules.

If I/O unit on redundant network is available, IsIoUnitReady and IsIoUnitCommEnabled commands may return false

Knowledge Base - KB91353 - 6/3/2026

If your PAC Control strategy works with a SNAP I/O unit configured with redundant Ethernet links, when communication is lost on the primary Ethernet link and the secondary Ethernet link becomes active,...more

Digital TPOs start operating upon I/O unit boot-up or after restart

Knowledge Base - KB91304 - 6/3/2026

After an I/O unit boots up or restarts, any I/O configurations stored in persistent memory are restored. If a TPO is restored, the TPO should not start controlling the digital output, but with this issue, it may.

SNAP PAC controllers and brains may not store Analog TPO period configuration to flash memory

Knowledge Base - KB91292 - 6/3/2026

If you have configured the TPO Period field on the Analog Point page in the Inspect Opto 22 Device window in PAC Manager, and you save the configuration to flash memory on a SNAP PAC controller, this...more

Values for string table elements are missing from non-volatile variables file

Knowledge Base - KB91287 - 6/3/2026

POSTs to the SNAP PAC REST API may fail when the closing bracket is on a different line than the data

Knowledge Base - KB91226 - 6/3/2026

When attempting to send a POST to the SNAP PAC REST API, the POST may fail if the closing bracket is on a different line from the data.

SSL certificates created with newer versions of OpenSSL may fail to load on SNAP PAC controllers

Knowledge Base - KB90687 - 6/3/2026

SSL certificates created with newer versions of OpenSSL (3.0 or newer) may fail to load on SNAP PAC controllers.

Some SNAP analog input modules report only -32768 or NaN to B3000-B series brains

Knowledge Base - KB91204 - 5/28/2026

When any of the affected SNAP analog input modules are used with SNAP-B3000, SNAP-B3000-B, or SNAP-B3000-B-OMUX brains, the modules report only -32768 or NaN.

"Copy Fail" Vulnerability in groov RIO

Knowledge Base - KB91499 - 5/15/2026

A vulnerability in the Linux kernel in groov RIO modules could be exploited by an attacker to obtain unauthorized administrative (or root-level) privileges to your groov RIO by crafting specific logic through Node-RED, CODESYS, or shell (SSH) access.

“Dirty Frag” Vulnerability in groov EPIC and RIO

Knowledge Base - KB91509 - 5/15/2026

The “Dirty Frag” vulnerability—a local privilege escalation vulnerability consisting of two separate CVE IDs (CVE-2026-43284 and CVE-2026-43500) could be exploited...more

groov RIO may not connect to network after a power cycle during network disruption

Knowledge Base - KB91501 - 5/13/2026

After a specific series of events that include a network disruption before you cycle power to a groov RIO, when you attempt to connect to your groov RIO, the browser reports that it can’t find the RIO.

Possible "Type mismatch" errors when compiling PAC Control strategies

Knowledge Base - KB90478 - 4/29/2026

Inductive Automation’s Ignition may stop updating data on groov EPIC processors and groov RIO modules

Knowledge Base - KB90752 - 4/29/2026

Restoring a groov RIO in Independent Port Mode may fail if using a pre-4.1.0 firmware backup file that includes Firewall settings

Knowledge Base - KB91439 - 4/1/2026

If restoring a groov RIO in Independent port mode (groov Manage Home > Network > Configure > Port Mode field) with a backup file created in pre-4.1.0 firmware, you may encounter a restore...more