BRONKHORST EL-FLOW Select Series - Measurement and control

Bronkhorst®
Instruction Manual EL-FLOW® Select9.17.099F 35
Value
Mode
Instrument action
Setpoint source
7
Setpoint 100%
Controlling, setpoint fixed to 100%
8
Valve Fully Open
Controller disabled, valve fully opened
9
Calibration Mode
Calibration mode enabled
(factory only)
10
Analog Slave
Acting as slave of other instrument in analog mode
Analog Input x Slave
Factor/00%
12
Setpoint 0%
Controlling, setpoint fixed to 0%
13
FLOW-BUS
Analog Slave
Acting as slave of other instrument on FLOW-BUS, slave
factor is set by analog input signal
RS485 only: FLOW-BUS
master output x Analog Input
18
RS232
Controlling, safe state deactivated
Fieldbus/RS232
20
Valve Steering
Controller disabled, setpoint redirected to Valve output
21
Analog Valve
Steering
Controller disabled, analog input redirected to Valve output
22
Valve Safe State
Force instrument in safe state
Immediately after power-up, Control Mode is set to 'Analog input’ or ‘BUS/RS232’ automatically, depending on the (requested)
default setting for analog or digital operation. If Control mode is set to value 0, 1, 9 or 18, the instrument returns to its
default control mode at the next power-up or reset. Other values are retained after power-up or reset.
4.2.1 Default control mode
IO Status
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Unsigned char
RW B
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 usually returns to its default control mode at every power-up or reset. The
default control mode can be set with parameter IO Status; to change it, use the procedures as described below.
Changing from digital operation to analog operation:
1. Set parameter Init Reset to 64 (unlocked)
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 (locked)
Changing from analog operation to digital operation:
1. Set parameter Init Reset to 64 (unlocked)
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 (locked)
The procedures described above do not change the value of parameter Control Mode directly. To apply the new default
control mode immediately, change the value of parameter Control Mode manually or reset or restart the instrument.
4.3 Measurement and control
Measure
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Unsigned int
R
0…41942
8
1/0
0x0020/33
This parameter indicates the flow metered by the instrument. The value of 32000 corresponds to 100%, the maximum
measured value output is 131.07%, which translates to 41942.