
EK280
Application Manual
129
Display
Designation
Meaning
Address
"x"
25
MBAdr
MMDir
Modbus_Master_AdrDirec
tion
Data direction
x:7C0
0: H-Wort first
1: L Word first
MMTrM
Modbus_Master_TransMo
de
Transmission mode
x:7C1
0: ASCII
1: RTU
2: RTU_TCP
MMAdr
Modbus_Master_SlaveAd
dress
Modbus slave address of
the remote object
x:7C2
Range: 0..247
MMAdM Modbus_Master_Address
Modus
Addressing mode
x:7C3
0: Log. mode
1:Phys. Addressing
MMALx
Modbus_Master_TaskListI
ndex
Index (instance) on the task
list as first task (1..70)
x:7C4
1..70
MMAAz
Modbus_Master_TaskList
NoTasks
Number of tasks from the
list index
x:7C5
1..70
Table 8: Modbus master info
8.2.4
Modbus parameters which are valid for the entire device
Some parameters cannot be parameterized for each link, but are valid regardless of the interface as well as
for Modbus master operation via all links as well as for Modbus slave operation.
Designation
Meaning
Address
"x"
26
MBAdr
Modbus_DeviceAddress
Own Modbus address
x:7B2
0...247 valid for the entire device. It
is the same as in slave mode
Modbus_RegisterSize
Register size = number of
bytes per register
x:7B8
2: 2 bytes (for 16-bit registers)
4 4 bytes (for 32-bit registers)
This applies to the entire device
regarding Modbus communication
(master and slave)
Table 9: Interface-dependent Modbus parameters for master and slave operations
i
Whilst both of these parameters are available in two instances, they both contain the same value.
The last described parameter overwrites the parameter in the other instance.
8.2.5
Connection parameters
The connection parameters which shall be set for the respective applications will be explained in the examples
below:
8.2.6
Modbus master via the terminal device (RS232 directly, RTU or ASCII format)
8.2.6.1 Connection
The connection of the RS232 interface is described in Chapters 7.4.1
and 7.4.1.2
25
"x" = Instance of the task (value range from 1-70)
26
“x” = instance of the interface (2 = terminal device (external modem), 3 = internal modem