West Control Solutions KS 92-1 - Manual (Page 70)

7.6 KS9x-1 as Modbus master
a
This function is only selectable with BlueControl (engineering tool)!
The KS9x-1 can be used as Modbus master ( ConF / othr / MASt = 1 ). The
Modbus master sends ist data to all slaves (Broadcast message, controller adress
0). It transmits its data (modbus adress AdrU) cyclic with the cycle time Cycl to
the bus. The slave controller receives the data transmitted by the masters and al-
locates it to the modbus target adress AdrO. If more than one data should be
transmitted by the master controller ( Numb >
1) , the modbus adress AdrU in-
dicates the start adress of the data that should be transmitted and AdrO indicates
the first target adress where the received data should be stored. The following
data will be stored at the logically following modbus target adresses.
With this it is possible e.g. to specify the process value of the master controller as
set-point for the slave controllers.
7.7 Back-up controller (PROFIBUS)
Back-up operation: calculation of the control outputs is in the master. The con-
troller is used for process value measurement, correcting variable output and for
display.
With master or communication failure, control is taken over independently and
bumplessly by the controller.
Special functions
KS9x-1 as Modbus master 70 KS 90-1 / KS 92-1
Additions othr
(only visible with BlueControl!)
Name Value range Description Default
MASt Controller is used as Modbus master 0
0 Slave
1 Master
Cycl 0...200 Cycle time [ms] for the Modbus master to transmit its
data to the bus.
60
AdrO 1...65535 Target address to which the with AdrU specified data
is given out on the bus.
1
AdrU 1...65535 Modbus address of the data that Modbus master gives
to the bus.
1