Modbus Master Via Internal Modem (Rtu_Tcp) - Honeywell EK280 Applications Manual

EK280
Designation
Modbus_Master_ Meaning
TaskList_ ...
...MdbNoReg Disp.
Register
...MdbRegRWMode RW-Mode
...MdbStartAdr Modbus-Adr.
...MdbNoReg Disp.
Register
...MdbRegRWMode RW-Mode
...MdbStartAdr Modbus-Adr.
...MdbNoReg Disp.
Register
...MdbRegRWMode RW-Mode
Table 12: Extract from the preprogrammed tasks in the Modbus task list
The parameterized trigger event must take place for communication to start. For testing communication, the
parameter 8:D71 can be set with the brief designation "TestC" to 1 on the device under link 8. The link is
then started as a test. Otherwise there will be a wait until the parameterized trigger event takes place.

8.2.7 Modbus master via internal modem (RTU_TCP)

p) Parameterization of the functions of the internal modem is described in  chapter 7.1.
a) Send the parameter file for Modbus parameterization
− Send the following parameter file to the EK280 ( chapter
EK280_xvx. - Modbus-Master RTU-TCP int.Modem Connection7 ext. Power supply (*)
q) The following Modbus parameters are preset in this file:
− Link 7 is set up for Modbus master communications via the integrated modem. The event type is a
point in time. Telephone book instances 1 and 9 (as alternative) are accessed
− Reference is made to instance 6 of Modbus master information
− "External supply" is set up as a supply type.
− The first 24 tasks on the task list are processed.
− A task list is parameterized which writes several Modbus addresses from the standard Modbus table
( chapter 8.1.1) to the client.
− Dummy APN data and dummy telephone book parameters. Such data must naturally be overwritten
with the correct parameters to enable communication to take place.
Display Designation
MMDir Modbus_Master_AdrDirection
MMTrM Modbus_Master_TransMode
The * asterisk represents the lower-case letter, used to identify the file version, i.e. "a"
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Application Manual
Address Value Content
16:8C6 2 2 registers
16:8C7 3 3: Write-FC16
17:8C5 317 6:311_1T.F - Temperature substitute value [°C]
17:8C6 2 2 registers
17:8C7 3 3: Write-FC16
18:8C5 319 14:314N2 - Nitrogen content [%]
18:8C6 2 2 registers
18:8C7 3 3: Write-FC16
Address Value Content
6:7C0 0
6:7C1 2
3.6 Send parameter file, p. 21):
0: H-Wort erst
2: RTU_TCP
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