Frequently asked questions

Every MergenHub module is enabled in every package: 11 drivers (Modbus, Siemens S7, OMRON, DNP3, IEC 104, IEC 61850, MQTT, OPC UA client and a simulator), the OPC UA server with unlimited clients, the REST API, Web SCADA/HMI, alarms, the historian, the Data Bridge (IoT gateway), virtual (advanced) tags and the MCP AI assistant.

Packages differ only by the number of tags a project may contain; there is no module, driver or client limit and nothing is a paid add-on.

Packages differ only by their tag limit: Starter 1,000, Standard 5,000, Professional 25,000, Corporate 50,000 and Enterprise unlimited. Every package includes the full feature set.

A tag is one data point read from a device (e.g. one flow meter reading). The count is the total static tags in the project (channels › devices › tags, including groups). Virtual tags, system tags, aliases and SCADA screens do not count.

When the limit is reached the API reports the limit and the current count. You upgrade the package in the portal; the new limit arrives at the next license refresh (within a few days, or instantly via a manual update check). No reinstall is needed.

An installation without a license runs in trial mode: all features are enabled and there is no tag limit. Only the runtime (scan engine) runs for 2 hours after each start; when the window expires scanning stops and tag quality becomes Bad.

For a new 2-hour window use the top-bar button, the tray menu's 'Restart runtime', or restart the service. Entering a license key lifts the limit instantly; no reinstall or restart is needed.

A perpetual license is paid once and is valid for life; it never expires. An annual subscription is billed yearly and has an end date; you renew it in the portal. After a subscription expires there is a 30-day read-only grace period (data keeps flowing, configuration is locked), then it falls back to trial mode.

Online: paste the key under Settings › License and click Activate; the application contacts the portal and stores a signed license document locally.

Offline (no internet on the server): under Settings › License › Offline activation you create a request file (.mhreq), upload it in the customer portal from any internet PC, download the license document (.mhlic) and import it in MergenHub.

Yes. A license is valid on one machine at a time. To move it online, Settings › License › Release frees the key immediately and you activate it on the new machine. Offline, a signed proof file (.mhrel) is produced. If the machine crashed, use 'Force release' in the customer portal; the old activation is blacklisted.

No. One license = one machine. Buy one license per server; dealers get volume discounts.

Bank transfer/EFT, online card payment and, for dealers, an open account (30-day terms). With a transfer the IBAN is shown after the order and the license is issued once payment is confirmed. Online card payment issues the license instantly (when enabled by the admin). Open-account orders issue the license and invoice immediately.

Add a package to the cart from the pricing page, sign in and choose a payment method to place the order. The key (in the form MH-XXXX-XXXX-XXXX-XXXX) appears in the customer portal and is e-mailed to you. You can also buy through a dealer.

Yes. Licenses are issued to your company; the order asks for the company name and tax ID. The invoice is issued when the order is confirmed and can be downloaded from the customer panel.

Approved dealers get volume discounts, open-account terms (30 days) and the ability to issue licenses on behalf of their customers. Fill in the dealer application form; we reply within one business day.

The first year of Maintenance & Support is included with every license. Version upgrades are free for the life of the license — you get every upgrade even without an active maintenance contract. Maintenance only affects whether support requests are answered; your perpetual license never expires when maintenance ends.

In the customer panel, select the license and add a Maintenance & Support renewal or a subscription renewal to the cart. The renewal is applied to the existing key; the application picks up the new date at the next refresh (import the new document if offline).

The refund window is 2 days from payment. Licenses that have not yet been activated (unused) are refunded automatically; for activated licenses you open a refund request from the panel.

The license document is stored under C:\ProgramData\MergenHub\license\, bound to the machine's fingerprint; copying it to another machine does not work. The document is refreshed automatically every few days. If the portal is unreachable the license keeps working.