ONICON System-10 MODBUS - Manual (Page 27)

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System-10-MOD Network Interface Installation Guide 05/14 - 0653-10 / 18321
Page 27
C. Resetting Totals
Registers 40064 through 40068 or 41065 through 41069 are integer registers that provide a
mechanism to reset totals. Each reset register is associated with a group of totalizing
registers and will reset all of the 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.
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IMPORTANT NOTE
ONICON BTU Meters contain internal registers for totalization. These registers will also be reset
by this action.
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 technical service prior to making any changes.
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.