Hach-Lange SC 1000 Controller Enhanced Communications User Manual
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Installation
3.10.3 Configure the Modbus TCP software module on the sc1000 controller
1. Set the MODBUS TCP tag to ON in the SYSTEM SETUP>MODBUS TCP menu.
2. Set the TCP PORT tag to 502 in the SYSTEM SETUP>MODBUS TCP menu.
Note: It may be necessary to select an alternative port depending on the corporate firewall
configuration. The responsible IT department will provide the necessary information regarding
this.
3. Create the telegram on the SYSTEM SETUP>MODBUS TCP>TELEGRAM
configuration screen (refer to sc1000 controller manual or
Note: The telegram defines which data points are transferred by the sc1000 controller, and in
what sequence this takes place. The data points and names are probe-dependent.
4. Make sure that the telegram address is entered under SYSTEM SETUP>MODBUS
TCP>MODBUS ADDRESS (default = 1).
Note: Devices at subsequent addresses are only responsive if
SYSTEM SETUP>MODBUS TCP>VIRTUAL SLAVES is set to ON.
5. Enter values in the SYSTEM SETUP>MODBUS TCP>SIMULATION menu to enable
the transfer of data to be tested.
6. Set the SYSTEM SETUP>MODBUS TCP>SIMULATION>SIMULATION menu to ON
to test the transfer of data.
Information regarding the data transfer is displayed in the SYSTEM SETUP>MODBUS
TCP>STATUS menu (refer also to
If all values have been set, the values transferred by the telegram can be queried and
processed further using any of the Modbus TCP clients.
A maximum of 5 Modbus TCP clients can be connected to the server at any one time. If
an additional Modbus TCP client attempts to establish a connection, the request will be
accepted but an existing connection will be lost as a result. The connection that has been
idle the longest is terminated.
SYSTEM SETUP
MODBUS TCP
MODBUS TCP
TCP PORT
TELEGRAM
MODBUS ADDRESS
VIRTUAL SLAVES
SIMULATION
STATUS
Figure 24 Modbus TCP status menu