KB85823
Published: July 31, 2017
Revision: 2.0

RESTful API: Out-of-range float values appear as 0 or "inf" instead of returning an error


Applies To:

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 Affected:

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

Resolved In Version:

Problem is fixed in version: FW R9.5e


Symptoms:

When using the RESTful API to send float values to a variable, the value will appear in PAC Control and in the REST interface as:

  • 0 (zero) if the value sent is too small
    For example: {"value":1.2345678E-39} 

  • inf if the value sent is too large
    For example: {"value":1.2345678E39} 
In both cases, the controller should return a -13 (Overflow error) without changing the value of the target variable.

Workaround:

Validate values before using them with the RESTful API.

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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