Product Overview and Engineering Role
The SimtoLink edge VPN secure-access gateway opens a site-to-site or remote dial-in IPSec/SSL VPN tunnel for OT devices, with access control plus certificate and key rotation, so the production network is not left on the public internet. It is for contracted maintenance, after-sales work, and links between several plants.
SimtoLink supplies a zoned topology template, hot standby of a pair (depending on the model), and log forwarding. Several Gigabit ports and an SFP uplink meet a redundant core. A 19-inch or DIN-rail chassis can be built to order in volume.
Reliability and Site Conditions
On electrical safety and EMC, the gateway has passed the CCC test items that apply. Ports have surge and reverse-polarity protection. A reinforced ground and a partitioned layout keep ground loops and common-mode noise down. Outdoor or coastal sites can take a higher ingress rating and a corrosion-resistant coating.
Parameters can be loaded in batches, thresholds can be set, and event video or waveforms can be stored when the model allows it. OTA carries configuration and firmware. Site acceptance is three checks: a power-on self-test, time alignment on the communications link, and a spot check of samples. For metering or safety duty, SimtoLink helps with submission to a third-party metrology institute and with the type-test file.
Key Hardware Parameters
The table is this gateway in a typical build, for selection and for the technical clauses of a bid. A wider range, redundant power, or an intrinsically safe explosion-proof variant is available from SimtoLink with the Hardware Specification and the Installation and Commissioning Guide. Order codes in the same family can differ slightly; the nameplate and the papers shipped with the unit govern.
| Parameter | Specification | Remarks |
|---|---|---|
| CPU | ARM A53 dual-core | Fanless |
| Memory / storage | 2G/8G eMMC | Industrial grade |
| Ethernet | 4×GbE + SFP | Redundant RSTP |
| Serial ports | 2×RS485 | Isolation 2.5kV |
| Wireless | Wi-SUN | External antenna |
| Protocol stack | IEC104/DNP3 | Expandable |
| Operating temperature | -39～74 ℃ | Wide temperature |
| Supply | AC 220V | Redundant terminals |
| Mounting | 19-inch | Grounding required |
| Security | VPN/IPSec | Firmware signature check |
Typical Deployments
How this gateway is usually installed, for choosing a design and for checking the integration.
Contracted and Remote Maintenance
Engineers reach PLCs and HMIs through an encrypted tunnel. The session is logged, and it can be opened only for the hours on the work order.
Links Between Plants
Headquarters and plant OT networks meet over VPN in a mesh or a star, without the cost of a clear-text leased line.
A Secure Exit to the Cloud
The IoT platform sees only the gateway’s public address. The devices behind it stay behind NAT and a firewall.
Installation, Grounding, and Maintenance
- Before power-up, confirm the supply range and polarity. If the feed is uncertain, check bus voltage and breaker rating with a multimeter.
- Use shielded twisted pair for the communications run, bond the shield at one end, and keep it out of long bundles with high-power cable.
- For first go-live, prove two-way read and write and the threshold triggers against the platform in the lab, then move the gateway to site.
- Outdoors, drainage and airflow come first. Inspect the sealing faces on a schedule, and hold lightning-protection earth resistance to the local code.
- In continuous service, spot-check samples and archive logs every 24 months.
Ordering, Documentation, and Support
SimtoLink supplies the hardware specification, an outline drawing, a wiring table, and a sample project. Volume orders can include a sample review and inspection at the factory. Warranty and calibration follow the contract and the documents shipped with the gateway.
Further Reading
Other hardware pages in this directory, for pairing a network exit with edge compute: