Remote Access to PLCs / PLCs

Remote Access to Your PLCs —secure, without opening any ports

Connect to your PLCs Siemens S7-1200/1500, Schneider M340/M580, Allen-Bradley CompactLogix and any Modbus equipment from anywhere, via an OpenVPN/IPSec VPN tunnel that can be set up in 5 minutes. TIA Portal, Unity Pro, and your SCADA system work just as if you were on the local network.

0 incoming port
Zero Inbound Port
<5 min
Field Deployment
Modbus+OPC-UA
Supported Protocols
99.97%
Guaranteed Uptime
14-Day Free TrialPLC Connection Guide
PLC Compatibility

Compatible controllers and equipment

Compatible with all major industrial PLC manufacturers. No changes to the PLC program are required.

Siemens

Siemens S7-1200

  • CPU 1211C / 1212C / 1214C / 1215C
  • Compatibility with TIA Portal V15+
  • Native S7comm and S7comm+
  • ET200 Modules and TP/KTP HMIs
Transparent access to TIA Portal via a tunnel
Siemens

Siemens S7-1500

  • CPU 1511/1513/1515/1516/1518
  • Safety CPU and Failsafe Supported
  • TIA Portal V16, V17, V19
  • PROFINET IO via IP tunnel
OPC-UA-compatible built-in server for the S7-1500
Schneider

Schneider M340 / M580

  • Modicon M340 BMX P34 1000/2010
  • Modicon M580 BMEP58•040/•060
  • M580 Hot Standby Supported
  • EcoStruxure Machine Expert
Unity Pro and EcoStruxure via Modbus TCP
Rockwell

Allen-Bradley CompactLogix

  • CompactLogix 5370/5380/5480
  • ControlLogix 5570/5580
  • Studio 5000 Logix Designer
  • EtherNet/IP and CIP supported
Local and Remote Access to RSLogix / Studio 5000
IHM

Industrial HMIs

  • Siemens KTP, TP, MP, Comfort
  • Magelis GTO/GTU (Schneider)
  • Pro-face GP4000 / SP5000
  • VNC / RDP / Web HMI Access
User Interface Screenshots and Remote Control
Modbus

Modbus RTU / TCP

  • RS-485 multi-drop with up to 32 nodes
  • Modbus RTU to Modbus TCP Bridge
  • Drives, meters, sensors
  • Reading/Writing Real-Time Registers
Native bridge integrated into the Eziwan gateway
Commissioning

How to Access Your PLC in 5 Steps

From gateway installation to the first remote access: less than 5 minutes, without opening a single port.

01

Install the Eziwan Gateway on a DIN rail

Mount the enclosure on the 35mm DIN rail in your electrical cabinet. Connect the 9–36V DC power supply. The gateway operates at temperatures ranging from -40°C to +75°C and can be installed directly alongside your PLCs without the need for a climate-controlled cabinet.

35mm DIN railDC 9–36 V-40/+75°CIP40
02

Connect the PLC via RS-485 or Ethernet

Connect your PLC to the gateway: use an RJ45 Ethernet cable for IP-networked PLCs (Siemens S7, Schneider M340/M580, Allen-Bradley), or an RS-485 bus for Modbus RTU devices (drives, sensors, meters). The RTU/TCP bridge is automatic.

RJ45 EthernetRS-485 / Modbus32-node multi-drop
03

Turn On — Automatic ZTP

When powered on for the first time, the gateway automatically connects to the Eziwan cloud via 4G LTE and establishes the OpenVPN/IPSec VPN tunnel. Zero-Touch Provisioning: no manual network configuration required, and no ports need to be opened on the site’s firewall.

ZTPOpenVPNZero configuration<2 min
04

Authenticate the technician

In the Eziwan Cloud console, assign access rights to the technician: list of authorized devices (by IP), time window, validity period, and 2FA requirement. Each access event is logged with a timestamp, the user’s identity, and the devices accessed.

2FARBACAudit logTemporary Access
05

Access via TIA Portal, Unity Pro, or the Modbus client

The technician activates the VPN tunnel on their PC. TIA Portal, Unity Pro / EcoStruxure Machine Expert, Studio 5000, or your Modbus client connect to the PLC as if they were on the local network. Modbus registers can be read and modified in real time.

TIA PortalUnity ProModbus TCPStudio 5000
Remote Actions

What You Can Do Remotely

Any tasks a technician would perform on-site can be completed from your office in just a few seconds.

📋
Read Modbus registers in real time
Holding registers, input registers, coils, and discrete inputs. Polling configurable from 100 ms to 60 min.
✏️
Writing Setpoints and Commands
Modify Modbus register values, force digital outputs, and change control setpoints.
🔔
Diagnosing Production Alarms
Access the PLC's alarm logs, fault history, and diagnostic status bits.
🖥️
Capture the UI screen and take control
VNC, RDP, or Web HMI: View and control the operator interface remotely without having to travel.
⬆️
Remotely deploy a program or firmware
Update the PLC program via TIA Portal, transfer a Unity Pro program, or update a device's firmware.
🔄
Restarting Equipment Remotely
Software restart of the PLC, restart of a drive, or reset of an input/output via the cloud console or digital output.
📊
View SCADA logs and trends
Access variable history data, trend graphs, and production reports stored on-site.
🔧
Configuring Variable Frequency Drives
Modify the settings of Schneider ATV, ABB ACS, and Siemens G120/G150 drives via Modbus RTU or Ethernet.
📁
Transfer Files to the PLC
Industrial FTP to Schneider M340/M580 PLCs, recipe transfer, configuration loading.
🛡️
Check the OT Cybersecurity Status
Review access logs, check for active connections on the OT network, and audit exposed devices.
📡
Testing Communication Between Devices
Ping, traceroute, Modbus scan of slave addresses, and OPC-UA communication test from the Eziwan console.
👥
Sharing Access with a Contractor
Create temporary, limited access for an external service provider or integrator, with one-click revocation.
IT Security · Zero Trust

Zero Trust Architecture for
your industrial OT networks

OT network security cannot be improvised. Eziwan implements a comprehensive Zero Trust architecture: every access attempt is authenticated, authorized, and logged. No incoming ports are open on your industrial network—your infrastructure remains invisible from the Internet.

Zero Inbound Port
The gateway initiates only outbound connections to the cloud. No network scanner can detect your OT devices from the Internet.
OpenVPN AES-256-GCM
AES-256-GCM end-to-end encryption with OpenVPN, a proven and extensively audited protocol. Firewall traversal via TCP port 443 and X.509 certificate authentication.
Segmentation by Equipment
Each user has access only to the equipment they are explicitly authorized to use. A technician working on the Line 1 PLC cannot see the Line 2 PLC.
Comprehensive audit log
Every connection is logged: user ID, time, duration, and devices accessed. Data can be exported to PDF or CSV for NIS2 and IEC 62443 compliance.
Zero Trust Flow — Remote PLC Access
01
PLC (OT network) → Gateway Eziwan
Ethernet / RS-485
02
Eziwan Gateway → Cloud Eziwan
Outbound OpenVPN — 4G LTE
03
Technician (authorized access) → Cloud Eziwan
OpenVPN client — Internet
04
Cloud Eziwan ⟷ Tourist Office Network Website
Encrypted tunnel — access granted
05
TIA Portal / Unity Pro ⟷ Automate PLC
Transparent Native Protocol
No exposed ports — OT network invisible from the Internet
Frequently Asked Questions

Everything You Need to Know About Remote Access to PLCs

Remote PLC Access · Deployment in 5 Minutes

Get your first PLC
remotely today

The Eziwan Gateway comes preconfigured with your multi-carrier SIM card. Mount it on a DIN rail, connect the PLC—and you're up and running in less than 5 minutes, without opening a single port.

Includes: Eziwan Gateway + Orange/SFR/Bouygues SIM card + 14 days of free cloud storage · No commitment