Bronkhorst®
Instruction Manual EL-FLOW® Select
9.17.099J
47
The slave instrument polls the output value of its master periodically and uses the slave factor to set its own flow relative to
the master's.
To prevent damage to the instruments an/or the system(s) they are connected to, be sure to avoid circular references
between devices on the same fieldbus. The FLOW-BUS system does not have a protection mechanism.
Master Node
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Unsigned char
RW
1…128
158
33/14
n/a
Sets the master node for the instrument.
Note that this parameter is only effective in a FLOW-BUS network with RS-485 communication.
Slave Factor
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Float
RW
0…500
139
33/1
0xA108…0xA109/41225…41226
The controller output from the master instrument is multiplied by
Slave Factor
/100 % to get the slave instrument setpoint.
In systems other than FLOW-BUS via RS-485,
Slave Factor
is effective only if
Control Mode
is set to 'Analog slave', and the
analog output signal of the master instrument is redirected to the input of the slave instrument.
Example:
·
master output = 80 %
·
Slave Factor
= 50
_
slave instrument setpoint = 80 % x 50 %/100 % = 40 %
