-| Trigger concurrency | * Unlimited when the concurrency control is turned off <p><p>* 25 is the default limit when the concurrency control is turned on, which can't be undone after you turn on the control. You can change the default to a value between 1 and 50 inclusively. | This limit describes the highest number of logic app instances that can run at the same time, or in parallel. <p><p>**Note**: When concurrency is turned on, the SplitOn limit is signficantly reduced to 100 items for [debatching arrays](../logic-apps/logic-apps-workflow-actions-triggers.md#split-on-debatch). If the number of items exceeds this limit, the SplitOn capability is disabled. <p><p>To change the default limit to a value between 1 and 50 inclusively, see [Change trigger concurrency limit](../logic-apps/logic-apps-workflow-actions-triggers.md#change-trigger-concurrency) or [Trigger instances sequentially](../logic-apps/logic-apps-workflow-actions-triggers.md#sequential-trigger). |
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