Local I/O Unit not enabled when using SNAP-UP1-M64 as Generic OptoMMP Device

Applies To:

SNAP-PAC-S1
SNAP-PAC-S2

Versions Affected:

Problem was discovered in version: R8.2a
Problem is fixed in version: R8.3a

Resolved In Version:

Problem is fixed in version: R8.3a

Symptoms:

Error -81, Error writing to the memory map, may be seen among other errors in the controller error queue when attempting to enable a SNAP-UP1-M64 I/O Unit type. The SNAP-UP1-M64 I/O unit is configured with the same IP address or loopback address (127.0.0.1) as the SNAP-PAC-S1 or SNAP-PAC-S2 that is running the strategy. Since the I/O Unit cannot be enabled, any attempts to write to the local memory map fail.

Prior to introducing the Generic OptoMMP Device I/O Unit type, the SNAP-UP1-M64 I/O Unit type was recommended as a means to communicate with the local memory map on an SNAP-PAC-S1 or SNAP-PAC-S2 controller.

Workaround:

We recommend changing the I/O unit type for all SNAP-UP1-M64 I/O units used just to communicate to the memory map and that have no I/O points configured on them, to Generic OptoMMP Device. If your version of PAC Control does not allow this type change, you can change it using the following procedure:

Note the IP address of your existing SNAP-UP1-M64, then change it to something that is not currently in use or likely to ever be used. For example, you might change it to: 1.1.1.1.
Create a new I/O unit of type Generic OptoMMP Device with a similar name to the SNAP‑UP1‑M64 I/O unit. For example, if the SNAP‑UP1‑M64 is named Snap_IO, name the Generic OptoMMP Device Snap_IO_new, and give it the IP address you just changed in the existing SNAP-UP1-M64.
Choose Edit→Replace from PAC Control. Find Snap_IO and replace with Snap_IO_new.
Save the strategy.
Delete the Snap_IO I/O unit.
Rename Snap_IO_new to Snap_IO. The PAC-S controller's I/O memory map can now be accessed with the correct I/O unit type.

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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