MergenHub Build plant rules by drag and drop
Flows triggered by a schedule, a tag value, an alarm or a webhook; branching on conditions and calculations; writing tags, sending email and SMS, calling HTTP. They run live on devices, every run is recorded step by step and shown live in the editor.
What it does
Rules such as "if the level stays below 8 m for 30 seconds stop the pump and text the operator", "reset the daily counter at 08:00 every morning" or "send a webhook to the maintenance system on a critical alarm" are defined as a flow chart, without code. The trigger → condition / AND / OR / calculation → action chain is evaluated every second; deadband, dwell time and cooldown prevent oscillation.
Key features
Five trigger types, an expression engine ({tag}, $value, $var, $payload, AND/OR/NOT, functions), conditions with true/false ports, AND/OR joins, seven action types, JSON import/export, folders, a live run panel (SSE) and audit logging. A flow that writes tags can only be saved by a user with the "Tag write" permission; the AI assistant builds and validates flows and enables them with your consent.
Core capabilities
Schedule · Tag · Alarm · Webhook
Cron or interval; value change / threshold / quality (deadband, dwell, cooldown); alarm raised/cleared/acked; anonymous webhook with a secret header.
Condition · AND · OR · Calc
Yes branch when the expression holds, otherwise no; AND waits for all inputs; calculation results become variables for later conditions.
Write · Notify · Call
Write tag (setpoint/command), email, SMS, HTTP request, event log, acknowledge alarm, run another flow.
Step by step
Runs and steps (duration, port, output, error) are recorded; nodes light up live in the editor and traversed edges animate.
Permissions + audit
Configuration write, tag write and service control are separate permissions; concurrent runs off by default; timeout; every change is audited.
Build with a sentence
The assistant verifies tag paths, creates the flow disabled, tests it with a manual trigger and opens the editor — enabling is your call.