Can't change state of output points on Mistic I/O units after power interruption

Applies To:

SNAP-PAC-S1
SNAP-PAC-S1-W
SNAP-PAC-S1-W
SNAP-PAC-S2
SNAP-PAC-S2-W

Versions Affected:

Versions affected: PAC firmware R9.4a through R9.5c
Problem is fixed in version: PAC firmware R9.5d

Resolved In Version:

Problem is fixed in version: PAC firmware R9.5d

Symptoms:

If power is cycled to a Mistic I/O unit and then communication from the PAC controller to the Mistic I/O unit is re-enabled, the controller won't send all the required point configuration commands to the Mistic I/O unit. Unless you previously stored a configuration to flash on the I/O unit, all points will default to being configured as inputs, so it will not be possible to change the state of output points.

(Communication from the controller to I/O units does not automatically get re-enabled by the controller. It can be done in strategy logic using a command like "Enable Communication to I/O Unit" and it can be done via PAC Control Debug mode when inspecting the I/O unit.)

NOTE: B3000 and B3000-B brains read which SNAP analog modules are present on the rack, so they will treat output modules as outputs. However, their scaling will revert to the default scaling for the particular SNAP analog module.

Workaround:

Change your re-enable logic to use the "Clear I/O Unit Configured Flag" command, followed by the "Enable Communication to I/O Unit" command.

Resolution:

Opto 22 has resolved this issue.

Questions?

Contact: Opto 22 Product Support.
Phone: 800-835-6786 or 951-695-3080
Email: support@opto22.com

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