Bronkhorst®
Instruction Manual IQ+FLOW® Series Digital Mass Flow / Pressure Controllers for Gases
9.17.045V
22
3.6.2
Basic measurement and control parameters
The list below provides the most basic parameters for digital communication with the instrument.
For more detailed information regarding operation parameters, see
Operation Instructions Digital Instruments
(document no 9.17.023)
Measured Value (Measure)
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Unsigned int
R
0…41942
8
1/0
0x0020/33
The 'Measured Value' indicates the amount of mass flow or pressure metered by the instrument. The signal of 0...100% will
be presented in a range of 0...32000. The maximum measured value output is 131.07 %, which is: 41942. A floating point
variable of the measured value, 'Fmeasure', is also available in the capacity and capacity unit for which the instrument has
been set, see
section 4
.
Setpoint
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Unsigned int
RW
0…32000
9
1/1
0x0021/34
The 'Setpoint' is used to set the required mass flow rate or pressure for the controller. The signals have the same range as
the measured value, only the setpoint is limited between 0 and 100% (0…32000). A floating point variable of the setpoint,
'Fsetpoint', is also available in the capacity and capacity unit for which the instrument has been set, see section 4.
3.6.3
Basic identification parameters
User Tag
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Unsigned char[16]
RW
-
115
113/6
0xF130…0xF136/61745…61751
The 'User Tag' parameter allows the user to give the instrument a custom tag name, with a maximum of 16 characters.
Customer Model
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Unsigned char[16]
RW
-
93
113/4
0xF120…0xF127/61729…61736
This parameter is used to add extra information to the model number information, such as a customer-specific model
number.
Serial Number
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Unsigned char[20]
R
-
92
113/3
0xF118…0xF11F/61721…61728
This parameter consists of a maximum 20-byte string with instrument serial number for identification, for example:
'M1111111A'.
BHT Model Number
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Unsigned char[23]
R
-
91
113/2
0xF110…0xF116/61712…61718
This parameter shows the Bronkhorst
®
instrument model type information.
