Knx Network/Tuning Policies/Default Policy

This is the default tuning policy which is always installed. More tuning policies may be created by copying this default policy.
Property Value Description
Min Write Time hh-mm-ss, 0ms ... +inf Defaults to 00–00–00 Applies to writable proxy points, especially ones that have one or more linked inputs. Specifies the minimum amount of time allowed between writes. Provides a method to throttle rapidly changing values so that only the last value is written. If this property value is 0 (default), this rule is disabled (all value changes attempt to write).
Max Write Time hh-mm-ss, 0ms ... +inf Defaults to 00–00–00 Applies to writable proxy points. Specifies the maximum wait time before rewriting the value, in case nothing else has triggered a write. Any write action resets this timer. If property value is 0 (default), this rule is disabled.
Write On Start true (default) or false Applies to writable proxy points. Determines behavior at station startup.
  • If true, (default) a write occurs when the station first reaches steady state.
  • If set to false, a write does not occur when the station reaches steady state.
Note: Consider setting this to false in most tuning policies, except for tuning policies selectively assigned to more critical writable proxy points. This is particularly important for large networks with many writable proxy points. For example, a Network with 4,000 writable proxy points, if configured with only the Default Tuning Policy (at default values), will upon station startup attempt to write to all 4,000 points, putting a significant load on the station. As a consequence, it is possible that in this scenario the driver (network) may generate write queue overflow exceptions.
Write On Up true (default) or false Applies to writable proxy points. Determines behavior when proxy point (and parent device) transitions from down.
  • If true, (default) a write occurs when the parent device transitions from down to up.
  • If set to false, a write does not occur when the parent device transitions from down to up.
Write On Enabled true (default) or false Applies to writable proxy points. Determines behavior when a proxy point’s status transitions from disabled to normal (enabled).
  • If true, (default) a write occurs when writable point transitions from disabled.
  • If set to false, a write does not occur when writable point transitions from disabled.
Note: The disabled-to-enabled status transition can be inherited globally by points if the parent device had been set to disabled—or network-wide if the driver network was set to disabled. Therefore, be aware that if left at true in tuning policies, that all associated writable points receive a write upon either the device or network when it transitions from status disabled to enabled.
Stale Time hh-mm-ss, 0ms ... +inf Defaults to 00–00–00 Applies to all proxy points.
  • If set to a non-zero value, points become stale (status stale) if the configured time elapses without a successful read, indicated by Read Status {ok}.
  • If set to zero (default), the stale timer is disabled, and points become stale immediately when unsubscribed.
By default, proxy point status stale is indicated by tan background color. In addition, stale status is considered invalid for any downstream-linked control logic.