ONICON System-30 MODBUS BTU - Manual (Page 35)

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System-30 BTU Measurement System MODBUS RTU RS485 04/14 - 0583-1 / 18345
Page 35
engineering units at the same time. Both integer and floating point registers will
be reset at the same time regardless of which set of reset registers are used.
To reset the totals associated with the register write a value of 1 to the register.
Once the totals are reset, re-write a value of 0 to the register.
D. Over-range & Rollover Conditions for Totals
All low order and middle order registers are designed to rollover to 0 when their
totals exceed 999. The maximum value that can be totalized in high order
registers is 65,534. A value of 65,535 is considered an over-range condition.
!
CAUTION
ONICON Btu meters contain internal registers for totalization. These registers will eventually roll
over to zero if the totals are not reset on a periodic basis. The associated MODBUS registers will
also rollover to zero when this occurs. The engineering units and multipliers programmed in to
the Btu meter affect the point at which the totals roll over. The factory assigned engineering units
and multipliers applied to the Btu meter display were chosen to eliminate the possibility of an
over-range condition in the MODBUS registers before the Btu meter registers roll over. Changing
the engineering units or multipliers at the Btu meter will affect the rollover point. Contact
ONICON prior to making any changes.
i
IMPORTANT NOTE
ONICON Btu meters contain internal registers for totalization. These registers will also be reset by
this action.