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KB80316
Local I/O Unit not enabled when using SNAP-UP1-M64 as Generic OptoMMP Device
Revision:  2.0
Published:  12/5/2008
Applies To
Firmware for:
SNAP-PAC-S1
SNAP-PAC-S2
Versions
Problem was discovered in version:  
R8.2a
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:

  1. 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.
  2. 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.
  3. Choose Edit→Replace from PAC Control. Find Snap_IO and replace with Snap_IO_new.
  4. Save the strategy.
  5. Delete the Snap_IO I/O unit.
  6. 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.

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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