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Click Here to Learn More!The most common error using Block Transfer Write (BTW) 59 on the HI 2160RC is leaving the Start, Pause, or Abort bits set after performing the desired function.
When the Start bit; BTW 59 (Word #2, Bit #6) is set, all data in the HI 2160RC rate controllers memory queue is replaced (flushed) with the data that is downloaded from the PLC. The rate controller operates in the volumetric mode until the queue is filled with data measured from the load cell. Filling the queue with measured data requires two Timebase periods (normally 4 seconds each). As long as the Start bit is set, the memory queue is continuously refreshed with PLC data and the instrument will not operate in the gravimetric mode. The HI2160RC controller will stay in the REC mode.
While any of the “Force Remote Function” (BTW 59, Word #2) bits are set, the function may not be overridden by the keypad. For example, while the “Pause or Abort” bits are set the process may not be started from the front panel. While the start bit is set the process may not be stopped from the front panel.
After a BTW 59 is performed with any word #2 bits set, it is necessary to repeat the command with no word #2 bits set to return the instrument to normal operations.
HI4060 Rate controller
There are not any pre-defined BTW command blocks. Each change or command is sent on it's own. This means if the rate does not change you only send the start command and the controller then transistions into automatic mode or gravimetric control. You still need to turn the start bit off. The ON or OFF commands need to be reset as the controller only recognizes command bits on the positive going leading edge. Send setpoint changes as desired.
It is a good idea to let the controllers settle into the automatic mode before sending changes. With a ROC time base of 4. This delay is only 8 seconds long. Then changes to the rate setpoint are a percentage of the current rate that has been established with the intial testing (START) phase.
