Opto 22

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KB53128
An I/O unit returns unexpected results from analog and digital I/O in PAC Control
Revision:  2.0
Published:  10/24/2006
Applies To
Firmware for:
SNAP-PAC-EB1
SNAP-PAC-EB1-W
SNAP-PAC-EB2
SNAP-PAC-EB2-W
SNAP-PAC-EB1-FM
SNAP-PAC-EB2-FM
SNAP-PAC-R1
SNAP-PAC-R1-W
SNAP-PAC-R2
SNAP-PAC-R2-W
SNAP-PAC-R2-FM
SNAP-PAC-S1
SNAP-PAC-S1-W
SNAP-PAC-S1-FM
SNAP-PAC-S2
SNAP-PAC-S2-W
SOFTPAC
OptoEMU Sensor Update File
G4EB2
Versions
Affects all versions through  
R9.3c
Problem is fixed in version:  
SoftPAC R9.3d, Hardware R9.3e

SYMPTOMS

The I/O unit and all points are not configured or their configuration does not match the PAC Control strategy; all digital outputs are configured as inputs; all analog points are in their default configuration; PID loops are not configured.

CAUSE

The Control Engine uses an I/O unit's PUC (Power-Up Clear) flag to determine if the unit needs to be configured. The PUC flag is set by the I/O unit when it powers up. If the flag is cleared by anything other than the Control Engine (for instance, by PAC Display), it will not know the I/O unit has powered and needs to be configured.

RESOLUTION

Opto 22 has resolved this issue.

MORE INFORMATION

Both the controller and the I/O unit(s) must have the new firmware. If either the controller or I/O has older firmware, the PUC flag will be used, so I/O will work exactly as it did before this update.

WORKAROUND

As part of commissioning a project, after the I/O has been configured, use PAC Manager to store each I/O unit’s configuration to flash by selecting, Tools > Inspect, Status Write > Store configuration to flash. By doing so, the I/O configuration resides on the I/O unit and is available should the unit reset or have power cycled to it.

Relevant Downloads
No relevant downloads have been specified.
Questions? Contact Opto 22 Product Support.
Phone: 800-835-6786 or 951-695-3080
Email: support@opto22.com

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This Opto 22 Knowledge Base ('OptoKB') article is intended to provide general technical information on a particular subject or subjects and is not an exhaustive treatment of such subjects. Accordingly, the information in this OptoKB article is not intended to constitute application, design, software, or other professional engineering advice or services. Opto 22 may modify the OptoKB articles at any time. Before making any decision or taking any action which might affect your equipment, you should consult a qualified professional.

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