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New HIDS Drum Scales!
Click Here to Learn More!The HI 4060 or the obsolete HI 2160 RC rate controllers cannot accept line speed input. Line speed signal is considered a tachometer output or output from an indexing source. The rate controller can track a wild flow with the help of the analog remote set point input. The rate controller can receive a rate from a PLC via RIO, Profibus, DeviceNet, ControlNet, EtherNet I/P, Modbus over TCP/IP or remote set point input analog signal. The PLC could use the line speed from the wild flow to calculate the required ratio. If the wild flow is changing and requires a rate controller rate change to match, all listed communications and the remote setpoint input are valid methods for the HI 4060.
The HI 4060 can make setpoint changes from any source at will. There is no longer the requirement for stop and re-start when using the HI 4060 rate controller
With the HI 2160RC, communication programs can only start at a set rate set point and must go to the stop mode to change that set point rate. So a series of Start, Abort and then immediately a Start with the new rate sequence would need to be programmed into the PLC. Your feeder should not pause at the stop command. The new start command should be within one logic scan.
The ratio control numbers are not calculated by the HI 4060. These are monitored and created by the PLC or DCS controllers.
The rate controller is used to maintain a rate of engineering units per time base as a batch or continuous amount, and maintains this controlled rate during refills and scale disturbances.