West Control Solutions N8840 - Manual (Page 75)

8 Special functions
8.1 8840 profiler as Modbus master
a
This function is only selectable with 8800/8840 Configurator (engineering tool)!
The 8840 profiler can be used as Modbus master ( ConF / othr / MASt = 1 ).
The Modbus master sends its 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 allocates 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
indicates 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.
Special functions
8840 profiler 75 8840 profiler as Modbus master
Additions othr
(only visible with 8800/8840 Configurator!)
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
Numb 0...100 Number of data that should be transmitted by the Modbus
master.
0
Master
KS 90-1 programmer
Slaves
KS 90-1, KS 50-1, KS 40-1
KS 40-1 universal
1 2 3 OK
SP.x run
Err
Ada
126
125
KS 40-1 universal
1 2 3 OK
SP.x run
Err
Ada
126
125
KS 40-1 universal
1 2 3 OK
SP.x run
Err
Ada
126
125
KS 40-1 universal
1 2 3 OK
SP.x run
Err
Ada
126
125
KS 40-1 universal
1 2 3 OK
SP.x run
Err
Ada
126
125
1 2 3 4
F
°C
°F
SP.2 SP.E
para func Ada Err
1200
1199
KS 90-1 programmer
run
- PrgEdit -
/
02/12:30
Example for transfering the programmer set-point