OPC UA server
Data connectivity
OPC UA, Unified Architecture, is a protocol for
information exchange for industrial communica
tion. This means that OPC UA is a standardized
vendor-independent Ethernet protocol, scalable
for a lean data access between a client and server.
OPC UA is widely adopted in many different
industries like automotive, food and beverage,
utilities and infrastructure.
OPC UA fulfills the requirements of IoT and
Industry 4.0. Security is established based on
certificates. AC500 V3 supports the OPC UA
services “Data access”, “User management” and
“Alarm and conditions”.
MQTT
Cloud connectivity
MQTT is a TCP/IP messaging protocol mainly
used for lightweight messaging to the cloud.
In the environment of MQTT, edge devices like
controllers act as clients and communicate with
a broker situated in the cloud.
They publish data based on events using topics.
Other clients like SCADA systems or monitoring
applications can subscribe to these topics and
receive data as they arrive. This enables the easy
and low-bandwidth connection of many devices.
AC500 V3 uses TLS encryption to establish secure
communication.
Secure connectivity
Remote units
AC500 works as edge-gateway and is directly
connected to the cloud. Security is established
through TLS encryption.
• No additional gateway required
• Low latency
Application:
Small systems with non-critical data transfer.
Network security
Connection of the whole AC500 network to the
cloud using a separate gateway. Enhanced
security is provided through additional firewall
and/or VPN.
• Advanced level of security
• Easy integration of many edge devices
Application:
Large systems with many devices which need
higher protection.
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