User Manual

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Siemens Universal controllers RMU710B, RMU720B, RMU730B CE1P3150en
Building Technologies Data acquisition 03.10.2011
9.2 Meters
1
2
i
i
Meter
Meters are used to acquire consumption values.
Pulses from gas, hot water, cold water and electricity meters are processed. The
pulse values represent:
 Energy in kJ, MJ, GJ, Wh, kWh and MWh
 Volume in m
3
, l or ml
 Variables without unit (0…3 decimal places)
 Heat cost unit
 BTU
The pulses are converted to consumption values as per the setting values, added,
and the cumulated values are stored as 15-month values at midnight upon month
rollover.
The meters are used to optimize plant operation.
Due to their inaccuracy, pulse counters in controllers are not suited for billing
purposes. Only direct meter readings (heat meters, electricity meters, etc.) provide
valid values. Meters using Namur or S0 circuitry are not supported.
Two independent meters are available.
9.2.1 Activate meters
Only inputs with identifier Pulse can be assigned (see section 8 "Inputs" on how to
proceed). Each meter is activated by assigning an input.
Main menu > Commissioning > Extra configuration > Data acquisition > Meter 1…2 >
Operating line Range Factory setting
Input n ---, N.X1, N.X2, ... ---
9.2.2 Display format
Operating line "Displayed unit" is used to select the unit to be displayed.
Data point "Displayed format" defines the number of decimal places.
Main menu > Commissioning > Extra configuration > Data acquisition > Meter 1…2 >
Operating line Range Factory setting
Displayed unit
Wh, kWh, MWh,
kJ, MJ, GJ
ml, l, m3,
Heat cost unit,
No unit,
BTU
kWh
Displayed format 0, 0.0, 0.00, 0.000 0
Purpose
Note
Configuration
Display format