Using FLOWBUS with FlowSuite (Fieldbus Communication Protocol)

FLOW-BUS

FLOW-BUS is a Fieldbus communication protocol designed by Bronkhorst; based on RS485 technology for digital communication between multiple digital devices. This communication protocol offers the possibility of host-control by PC (i.e. FlowSuite, LabVIEW, Python).

FlowSuite

FlowSuite is a WindowsOS application for monitoring and service purposes on Bronkhorst digital instruments via a single interface or with multiple windows for multiple devices. FlowSuite offers good insight into the dynamic behavior of Bronkhorst flow meters and controllers.

Advantages of Using FlowSuite:

• Allows adjustment of controller, alarm, and counter settings
• Built-in trend chart graph for 4 devices, each device can trend up to 7 inputs
• Measured data in a comma-separated file (CSV), thus serving as a data logger

Communication is via RS232 using the PC USB port. FlowSuite has a fixed 38400 bps baud rate. FlowSuite polls and scan each device separately and as you add devices to a USB port, the longer the update time for the software. For more information and download please visit: Get Bronkhorst FlowSuite – Microsoft Store or download Bronkhorst FlowSuite from the Microsoft App store.

Using FLOW-BUS Fieldbus Communication Protocol for Process Control

Bronkhorst instruments are equipped with a micro-controller for exchanging parameter value information with other instruments and devices connected to the same FLOW-BUS system and/or via RS232 to a PC. Below are examples of the CEM (Controlled Evaporative and Mixing) System, EL-FLOW Prestige, and mini CORI-FLOW (other examples can be provided, such as the MASS-STREAM, IN-FLOW, pressure controllers, or combination of devices).

• Bronkhorst devices are connected via FLOW-BUS, RS485 (red cables)
• PC USB port connects via RS232 to the first device (green cable)
• FlowSuite displays the PV (Process Variables), controls the SP (Setpoint), along with graphing and data logging up to 4 devices
• Standard RJ45 Shielded (F)TP patch cable or M12 (DeviceNet) cable supplies the FLOW-BUS signal and 24 Vdc power
• 1A @ 24Vdc or 24 Watts is the max power for RJ45 Shielded (F)TP patch cable, 4A for the M12 cables

Bronkhorst CEM System with E-8000 24 Vdc Power Supply

Bronkhorst EL-FLOW Prestige with Customer Supplied 24 Vdc Power Supply

Bronkhorst mini CORI-FLOW with Customer Supplied 24 Vdc Power Supply

Other Fieldbus Communication Protocol Considerations:

FLOW-BUS and Modbus is a LINE topology serial communication protocol over RS485 Each device must be “daisy chained” one after another with begin and end resistors.

• Max cable length from Multiport Adapter to Device is 0.5m (20”)
• LINE Topology
• STAR Topology FORBIDDEN
• Is not like a PoE Ethernet Switch and not to be connect like an Ethernet switch