Operating guide
4.0 Components overview
Please see 'System overview' on page 2 where the placing of the components is shown in a drawing.
4.1 ECL Comfort 296 / 310 controller
•
Connected to 3G modem via Ethernet cable
•
Configured for STATIC IP
4.2 3G modem
• 3G modem with Ethernet interface
• Built in router. The router must be configured to forward
incoming traffic from WAN to LAN on TCP Port 502 to the IP
address of the ECL Comfort 296 / 310 controller.
Preferably, it should forward only the traffic received from the IP
address of the SCADA server.
• Built in firewall. The firewall must be configured not to block in-
coming traffic from WAN to LAN on TCP Port 502.
• Built in support for DynDNS (preferred). DynDNS must be
configured to use the user's DynDNS account. If DynDNS is not
used/supported then the IP address on the WAN side of the 3G
modem must be public and static (special subscription at
mobile internet service provider is typically needed).
4.3 DynDNS service provider
• User account at DynDNS service provider must be created.
• The URL specified by DynDNS for the 3G modem, i.e. xyxyxy.
dyndns.info, must be known.
4.4 SCADA server with OPC server software
• Must have OPC Server for ECL Comfort 296 / 310 controller
installed.
The devices (ECL Comfort 296 / 310 controller communicating
via 3G)
created in the OPC Server must be configured to use Modbus-
TCP connection to the URL specified by DynDNS and TCP Port
502.
• Polling rates and timeouts must be specified carefully to
achieve reliable communication via 3G. Max. polling rate may
have to be increased from default value. Read and write time-
outs typically have to be increased from default values, i.e. to
5000ms. The suspend period, e.g. the period a device is sus-
pended from communicating if some timeouts (timeouts to
suspend) have occurred, may also have to be increased from
defaut value.
See example on the other side of page.
4 | © Danfoss| 2017.01
ECL Comfort 296 / 310 via 3G / 4G to SCADA server
Security note:
The Modbus/TCP implementation guide does not specify a
specific security model.
The ECL Comfort 296 / 310 controller does not use any form for
access control restriction and it is therefore strongly advised to
only use it on a secure network where a router/firewall provides
security to other local networks or the internet. In most routers
it is possible to set simple access restrictions for which kind of
internet traffic that are allowed to reach the ECL Comfort 296
/ 310 controller.
Modbus/TCP communication is not affected by the removal
of the key from the ECL controller. It is still possible to change
all settings through communication even if the key has been
removed in order to prevent this!
Screenshot of the OPC Server software for ECL Comfort 296 / 310 con-
troller.
The example indicates important settings to make when using a 3G /
4G connection.
VI.HX.F2.02
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