
EK280
Application Manual
128
8.2.2
Parameterization of Modbus master tasks
It is established via the Modbus master task list which and how much data shall be read or written. This
Modbus master task list, just like the standard Modbus table (see Chapter 8.1.1) contains a maximum of 70
entries (instances).
There is only one Modbus master task list for the whole device. Various links can be parameterized, which
due to various events access different parts of the Modbus master task list via the parameterized Modbus
master info instance. The corresponding part of the Modbus master task list must therefore be parameterized
for each of these events. Parts of the Modbus master task list can also belong to several connections.
The task list consists of three parameters per instance:
Display
Designation
Meaning
Address
"x"
24
MBAdr
MMSAd
Modbus_Master_AufgList
_
MdbStartAdr
The Modbus address from
which
the
number
of
registers shall be read /
written
x:8C5
All Modbus addresses
are possible here which
can be found in the
standard Modbus table
(see Chapter 8.1.1)
MMAR
Modbus_Master_AufgList
_
MdbAnzReg
Number of registers, from
which the Modbus address
shall be read / written
x:8C6
MMRW
Modbus_Master_AufgList
_
MdbRegRWMode
RW-Mode
x:8C7
0: Read-FC03
1: Read-FC04
2: Write-FC06
3: Write-FC16
Table 7: Parameters of the task list
Push-Mode (Write-FC06 / Write-FC16)
The Modbus addresses configured in the task list are read in the device. In this case the corresponding LIS
rights are used. For this reason the lock level is also transferred in the link. It must be noted in this case that
the lock level cannot be higher than the lock level used for parameterization of the task list.
The writing of data to the remote object can take place by means of two different function codes (FC).
FC06: Write Single Register
FC16: Write Multiple Registers
Pull Mode (Read-FC03 / Read-FC04)
The Modbus addresses configured in the task list are retrieved in the Modbus slave (retrieval system) and
written internally. In this case the LIS rights of the respective data are used. For this reason the lock level is
also transferred in the link. It must be noted in this case that the lock level cannot be higher than the lock
level used for parameterization of the task list.
The retrieval of data to the remote object can take place by means of two different function codes (FC).
FC03: Read Holding Register
FC04: Read Input Register
The data format within which the data in this register is transferred, is parameterized via the Modbus list
(Chapter 8.1.1).
8.2.3
Modbus Master Parameter (Modbus Master Info)
The Modbus master info which is to be parameterized is configured separately. The connection parameter
"connection_protocol info" (LIS address x:D79) refers to the Modbus master info instance (1-8), which should
be used for the link. Individual Modbus master info can be used for each link.
24
"x" = Instance of the task (value range from 1-70)
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