1. How a line stays online when the cable does not
A smart factory uses industrial gateways, edge nodes, and line terminals to collect machine data, tie into MES (manufacturing execution system), watch equipment utilization (OEE), and send industrial video back. OPC and Modbus are the usual protocols. The gateway gathers them and uploads over 4G or 5G. Inside the plant, industrial Ethernet is still the norm. Cellular is for another site, a machine that moves, remote maintenance, and rooms with no cable. SimtoLink supplies manufacturers and integrators with 4G and 5G SIMs, VPDN, and an API into MES, ERP, and the industrial internet platform.
2. Gateways, lines, video, and the twin
Industrial gateways, line equipment, video, and remote maintenance do not need the same bandwidth or the same freshness:
Industrial gateways and protocol aggregation
The gateway gathers OPC, Modbus, and similar protocols and uploads over 4G or 5G to the cloud or to MES, for utilization, production data, and quality traceability.
Line equipment and MES
Line sensors and industrial PCs report production data over 4G, for MES, scheduling, quality analysis, and capacity totals.
Industrial video and AR maintenance
Shop cameras and AR glasses send video over 4G or 5G, for remote inspection, AI quality checks, and AR guidance, at about 1-5GB a month.
Edge computing and the digital twin
Edge nodes and the twin need wide bandwidth to sync line state and 3D models, for virtual-physical mapping and predictive maintenance.
3. What the plant link has to guarantee
- Across sites and rooms with no cable: Another plant, an older workshop, and mobile equipment often have no wired network. 4G or 5G is what keeps gateways and line terminals online.
- MES and ERP: The gateway gathers OPC and Modbus and uploads to MES over 4G, for scheduling, quality traceability, and utilization totals.
- Bandwidth for video: Nodes that carry video or AR maintenance run higher, at 1-5GB a month. A digital twin needs wide bandwidth to stay in sync.
- Security and compliance: Production data and process parameters need a VPDN, TLS, and an IP allowlist, kept off the public network.
- Pools and spare: Pool by line or workshop, keep 20%-30% spare, and use VPDN so the path stays private.
4. Which SIM belongs on the gateway, the line, and the camera
Bandwidth and freshness differ by machine. Weigh the device and the job. Use the table as a starting point for a typical line:
| Use | Recommended network | Why it fits |
|---|---|---|
| Industrial gateways and MES | 4G | OPC/Modbus aggregation, line data |
| Line equipment and sensors | 4G | Equipment utilization, quality traceability |
| Industrial video and AR maintenance | 4G / 5G | Wide bandwidth, low latency, 1-5GB/month |
| Digital twin and edge computing | 5G | Wide bandwidth, virtual-physical sync |
5. How much a gateway uses
A gateway typically uses about 500MB-5GB a month, and video or AR sits higher. Pool by line or workshop, keep 20%-30% spare, and use VPDN so the path stays private.
6. Security around production data
The traffic includes production data and process parameters, and the security level is high. The plant needs a VPDN, TLS, and an IP allowlist. SimtoLink provides the VPDN, a private APN, and real-name registration together.
7. What SimtoLink recommends for the line
For a smart factory, use 4G/5G IoT SIMs on industrial gateways, line equipment, and video monitoring. The gateway gathers OPC/Modbus and uploads to MES. Nodes that carry video or AR maintenance need the larger allowance. The plan is built around 99.9% network availability, a VPDN, a large-data plan, and an API into MES and ERP.
8. From a pilot line to the rest of the plant
Take a factory rollout through these stages:
Pool and choose the SIM by line or workshop. Check signal coverage on the site, set the VPDN, APN, and allowlist, and alert at 80% of the data allowance. SimtoLink covers the work from the first line through the rest of the plant. Contact us for a plan sized to the site.