Bronkhorst®
Instruction Manual ES-FLOW™
9.17.116B
33
3.4.2.1 Default control mode
IO Status
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Unsigned char
RW
0…255
86
114/11
0x0E4B/3660
The instrument is set to accept a setpoint from either an analog or a digital source. Although this setting can be changed
with parameter
Control Mode
, the instrument will always return to its default control mode at every power-up or reset.
Parameter
IO Status
sets this default control mode; to change it, use the procedures as described below.
Changing from digital operation to analog operation:
1. Set parameter
Init Reset
to 64
2. Read parameter
IO Status
3. Add 64 to the read value
4. Write the new value to parameter
IO Status
5. Set parameter
Init Reset
to 82
Changing from analog operation to digital operation:
1. Set parameter
Init Reset
to 64
2. Read parameter
IO Status
3. Subtract 64 from the read value
4. Write the new value to parameter
IO Status
5. Set parameter
Init Reset
to 82
3.4.3
Measurement and control
Measure
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Unsigned int
R
0…41942
(65535*)
8
1/0
0x0020/33
This parameter indicates the flow metered by the instrument. The signal of 0…100% is presented in a range of 0…32000.
The maximum measured value output is 131.07%, which translates to 41942.
*In case the instrument is prepared for bi-directional measurement, the negative signals with an output range of -
73.73…-0.003% are represented by the range of 41943…65535, whereas the positive signals 0…131.07% are still
represented by the range of 0…41942. (FlowDDE converts the numbers to negative values automatically).
Setpoint
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Unsigned int
RW
0…32000
9
1/1
0x0021/34
This parameter is used to set the required flow rate for the controller. The signals have the same range as
Measure
, only the
setpoint is limited between 0 and 100% (0…32000).
Fmeasure
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Float
R
-3.4E+38…
3.4E+38
205
33/0
0xA100…0xA101/ 41217…41218
Floating point variant of
Measure
.
Fmeasure
shows the measured value in the capacity and capacity unit for which the
instrument has been set.
Fmeasure
is dependent of
Capacity Unit
and
Sensor Type
.
