Bronkhorst Mini CORI-FLOW - Manual (Page 28)

BRONKHORST CORI-TECH B.V.
3.8 BUS / digital operation
Operation via fieldbus reduces the amount of cables to build a system of several instruments and offers more
parameter values to be monitored/changed by the user.
See instruction manual: operating digital mass flow / pressure instruments for more details (document nr.
9.17.023).
Operation by means of a fieldbus adds a lot of extra features (compared to analog operation) to the
instruments.
Such as:
- adjustable filter settings to smoothen or speed-up the output signal
- setpoint slope (ramp function on setpoint for smooth control)
- adjustment of controller output (response time) for valve or pump control (PID-settings)
- direct reading at readout/control module or host computer
- testing and self diagnosis
- response alarm (setpoint-measure too high for too long time)
- several control/setpoint modes (e.g. purge/close valve)
- master/slave modes for ratio control (FLOW-BUS only)
- identification (serial number, model number, device type, user tag)
- adjustable minimal and maximal alarm limits
- (batch) counter
- adjustable response time for controller when opening from zero
- adjustable response time for normal control
- adjustable response time for stable control (|setpoint-measure| < 2%)
Special software like FlowDDE, FlowPlot and FlowView can be used to control these settings.
For operation of digital instruments by means of a specific fieldbus system or RS232, see following documents
(available as PDF-file):
• for FLOW-BUS document number: 9.17.024
• for PROFIBUS-DP document number: 9.17.025
• for DeviceNet document number: 9.17.026
• for RS232 document number 9.17.027
• for Modbus document number 9.17.035
page 28 9.17.050