Product overview and engineering role
The SimtoLink soft-PLC edge unit is for sites that replace a conventional controller with a software PLC runtime, or run the two side by side. Ratings on this page are for selection, a tender clause, and a later spot check. An IEC 61131-compatible runtime, data collection, and a visualization component share one box, so the cabinet holds fewer devices. Isolated I/O, a watchdog, and the safety-zone policy can be cut to the SIL you need. Signed firmware and OTA updates support volume delivery and remote maintenance.
Isolated digital and analog I/O, a fieldbus port, and a gigabit uplink are the default, so the unit can join an existing PLC, remote I/O, and SCADA. SimtoLink supplies IEC 61131 example projects, online download, and a safety-zone checklist to shorten joint commissioning. Volume builds can include a terminal-definition drawing and advice on safety-relay peripherals.
Reliability and field fit
Electrical safety and EMC coverage includes the CCC items that apply. Ports are protected against surge and reversed polarity. Reinforced grounding and a partitioned layout reduce ground-loop and common-mode interference. Outdoor or coastal sites can use a higher ingress rating and a corrosion-resistant coating.
Software supports online download, redundancy, and version rollback where the ordered model supports them. The runtime and library files update over the air. On site, finish a power-on self-test, force the I/O, and spot-check the safety loop. For metering or safety use, SimtoLink helps prepare a submission to a third-party metrology institute and supplies type-test documents.
Key hardware parameters
The table is a typical soft-PLC edge build, for selection and for a technical clause in a tender. For a wider range, redundant power, or an intrinsically safe version, ask SimtoLink for the hardware specification and the installation and commissioning guide. Order codes in the family can differ slightly; the nameplate and the documents shipped with the unit govern.
| Parameter | Specification | Notes |
|---|---|---|
| PLC runtime | IEC 61131-3 compatible (CODESYS and similar, by order code) | Task cycle and jitter from measured results |
| CPU | x86 or ARM embedded multi-core | Core isolation and real-time patches depend on the model |
| Memory | 8～32 GB | Buffer for the project, trends, and waveform records |
| Storage | SSD / CFast and similar (by model) | Retention policy for recipes and event records |
| Field I/O | Isolated DI/DO, AI/AO; remote I/O can be added | Channel count and isolation class follow the nameplate |
| Fieldbus | Profinet, EtherCAT, Modbus, and similar, optional | Slave count and topology need a plan |
| Network | Dual GbE | IEEE 1588 if the station needs time sync |
| Operating temperature | -20～60 ℃ (typical inside a cabinet) | Inlet air and side-by-side spacing |
| Power | DC 24 V (12～36 V wide range optional) | Redundant power module optional |
| Mechanical | DIN rail / wall-mount control box | Grounding and a safety-relay peripheral optional |
Typical applications
Four ways this unit is usually used, for design and for judging payback:
Small line control station
Interlocks and sequence control for one machine or one station stay in software, so the process can change without a new hardware backplane.
Pump sets and water-treatment stations
Rotation, failover, and energy logic run locally, so a lost link can still stop the plant safely.
Building mechanical and electrical plant
Group control of air conditioning, lighting, and fresh air sits on the same unit as the BACnet/Modbus devices.
Distributed energy station control
The grid-tie setpoint, storage, and the diesel generator close their loop at the edge, and only a short KPI set goes upstream.
Installation, grounding, and maintenance
- Confirm supply range and polarity before power-up. Measure bus voltage and breaker rating if the drawing is unclear.
- Use shielded twisted pair, ground the shield at one end, and keep it off long shared routes with high-power cables.
- In the lab, finish a two-way read and write and a threshold trip against the platform before the unit goes to the cabinet.
- An outdoor mount needs drainage and airflow. Recheck the seal. Lightning-earth resistance must meet the local code.
- Every 6 months, spot-check I/O, drill a redundancy switchover, and archive logs.
Ordering, documentation, and support
Ask SimtoLink for the hardware specification, outline drawings, a wiring table, and example projects. A volume order can include a sample review and an inspector at the plant. Warranty and calibration follow the contract and the papers packed with the unit.