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KB86565
Performance issue when looping "Accept Incoming Communication" without an available connection
Revision:  1.0
Published:  4/12/2017
Applies To
PAC Firmware for:
SNAP-PAC-S1
SNAP-PAC-S1-FM
SNAP-PAC-S1-W
SNAP-PAC-S2
SNAP-PAC-S2-W
SNAP-PAC-R1
SNAP-PAC-R1-FM
SNAP-PAC-R1-W
SNAP-PAC-R1-B
SNAP-PAC-R2
SNAP-PAC-R2-FM
SNAP-PAC-R2-W
Versions
Versions affected:  
PAC firmware R9.5a through R9.5d

SYMPTOMS

A controller's host communication—as well as all the other charts in the strategy—slow down when:

  • The strategy loops through (that is, repeatedly performs) an Accept Incoming Communication command.
  • There is no connection available to be accepted.
  • Any COM handle referenced by Accept Incoming Communication has a long timeout.
This is especially noticeable if the strategy is associated with an HMI that has an item that updates frequently (such as a clock or timer).

WORKAROUND

The default timeout for an Ethernet COM handle is 10 seconds; reduce this to 0.1 seconds, and the problem will be minimized.

In addition, add a Delay (mSec) command with a value of 1 or greater in the loop (so that the system doesn't immediately try again).  The higher the value, the more the issue will be minimized.

RESOLUTION

Opto 22 has resolved this issue and will include the fix in an upcoming release.

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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