Measurement And Control - BRONKHORST FLEXI-FLOW Compact Instruction Manual

This section describes the most commonly used parameters for digital operation of the FLEXI-FLOW™. Descriptions are
grouped by category in tables as shown below:
Type
[type]
In this manual, parameter names are printed in italics (reverted to normal where embedded in italics, like in this tip).
Type
Unsigned char 1 byte unsigned integer (0...255)
Unsigned int 2 byte unsigned integer, MSB first (0...65535)
Unsigned long 4 byte unsigned integer, MSB first (0...4294967295)
Float 4 byte floating point, IEEE 32-bit single precision, MSB first
Unsigned char [x] x byte text string
Access
R Parameter value can be read
W B Parameter value can be written
Parameter is secured and only accepts values if parameter Init Reset is set to 'unlocked' first
Range
Some parameters only accept values within a certain range:
[x] Minimum value
[y] Maximum value
FlowDDE
Parameter number within FlowDDE
FLOW-BUS
FLOW-BUS uses the ProPar protocol, where parameters are identified by a unique combination of a process number and a
parameter number.
·
For more information about setting up a FLOW-BUS network with Bronkhorst® instruments, consult the FLOW-BUS
manual (see
·
For more information about the ProPar protocol, consult the RS-232 manual (see
Modbus
In the Modbus protocol, parameters are accessed by specifying their unique decimal register number or corresponding PDU
address (Protocol Data Unit). The PDU address is the hexadecimal translation of the register number minus 1, e.g. register
number 1 corresponds to PDU address 0x0000, register number 11 corresponds to PDU address 0x000A:
[address] Hexadecimal PDU address
[register] Decimal register number
Modbus address blocks are two bytes big. Larger data types use up to 8 subsequent address blocks, resulting in a
maximum variable length of 16 bytes. Values longer than the maximum length are truncated.
For more detailed information about setting up a Modbus network with Bronkhorst® instruments, consult the Modbus
manual (see
4.3.1

Measurement and control

Fmeasure
Type
Float
This parameter represents the value of parameter Measure, expressed in the selected Capacity Unit. Its value is calculated from
the dimensionless value of Measure, using the fluid set parameters Capacity 100% and Capacity Unit.
24
Access Range
B
RW [x]...[y]
9
Documentation ).
9
Documentation ).
Access Range
R -3.4E+38...
3.4E+38
Instruction Manual FLEXI-FLOW™ Compact
Bronkhorst®
FlowDDE FLOW-BUS
[DDE par] [Pro]/[Par]
FlowDDE FLOW-BUS
205 33/0
Modbus
[address]/[register]
9
Documentation ).
Modbus
0xA100...0xA101/ 41217...41218
9.17.158D