Install An Expansion Module; Modbus Tcp/Ip - Hach SC4200c User Manual

Figure 10 Connect the relays
Terminal Description
1 Relay 1, NC
2 Relay 1, common
3 Relay 1, NO
NC = normally closed; NO = normally open

Install an expansion module

Explosion hazard. This manual is only for installation of the unit in a non-hazardous location. For
installation of the unit in hazardous locations, use only the instructions and approved control drawing
provided in the hazardous location installation manual.
Expansion modules with analog outputs, analog inputs and Profibus communication are available for
the controller. Refer to the documentation supplied with the module for additional information.

Modbus TCP/IP

Modbus TCP/IP is a standard for industrial communications. The Modbus TCP/IP protocol connects
computers to measurement and control systems that use the TCP/IP protocol for data transmission.
This type of data transmission is known as machine to machine (M2M) communication.
The controller is factory configured to be integrated directly in programmable logic controller (PLC)
systems. PLC systems record and process the controller measured data. The data analysis and the
procedures caused by the results are programmed in the PLC system.
Use the ethernet connector for TCP/IP based fieldbus communications to connect the controller to a
PLC system. Refer to
controller cannot connect to Modbuts TCP/IP. Make sure to disable the internet sharing setting and
configure the ethernet port to adapt the Modbus TPC slave IP address to the PLC IP subnet
Table 4 Wiring information—relays
Figure 6 on page 13. When the controller is configured to share the LAN, the
Terminal
4
5
6
W A R N I N G
Description
Relay 2, NC
Relay 2, common
Relay 2, NO
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