Bronkhorst®
Instruction Manual EL-FLOW® Select
9.17.099J
46
Inlet Pressure
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Float
RW
B
0…3.4E+38
178
113/13
0xF168…0xF169/61801…61802
Inlet pressure of the selected fluid in bar(a)
Outlet Pressure
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Float
RW
B
0…3.4E+38
179
113/14
0xF170…0xF171/61809…61810
Outlet pressure of the selected fluid in bar(a).
Fluid Temperature
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Float
RW
B
-250…500
181
113/16
0xF180…0xF181/61825…61826
Temperature of the selected fluid in °C.
Density
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Float
RW
B
0…3.4E+38
170
33/21
0xA1A8…0xA1A9/41385…41386
Density of the selected fluid in kg/m
3
Heat Capacity
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Float
RW
B
0…3.4E+38
250
113/18
0xF190…0xF191/61841…61842
Heat capacity of the current fluid in J/kg·K
Thermal Conductivity
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Float
RW
B
0…3.4E+38
251
113/20
0xF1A0…0xF1A1/61857…61858
Thermal conductivity of the current fluid in W/m·K
Viscosity
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Float
RW
B
0…3.4E+38
252
113/21
0xF1A8…0xF1A9/61865…61866
Dynamic viscosity of the current fluid in Pa·s
4.8
Master/slave configuration (FLOW-BUS)
Normally, there is no communication between the instruments in a fieldbus system. The FLOW-BUS protocol, however,
provides a feature to set up a master/slave relationship between two instruments. The typical behavior of a slave
instrument is to automatically set its own setpoint relative to the output (measurement value) of its master.
The output value of any instrument in a FLOW-BUS network is automatically available to all other instruments without
extra wiring. A slave instrument can also be a master to other instruments.
To setup a master/slave relationship between instruments, first determine which instrument should be the master and
which should be the slave, then set
Control Mode
of the slave instrument to ‘FLOW-BUS Slave’ (value 2) or ‘FLOW-BUS Analog
Slave’ (value 13), depending on how the setpoint should be calculated (see parameter
).
