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104 HRB1684301-01
Chapter 11—Multi-tariff feature PowerLogic™ PM5500 series user manual
Command mode overview
You can use this mode to send a Modbus command to the device which sets the active
tariff. This tariff is applied to the measured energy until you send another Modbus
command that sets a different tariff.
Related topics
• Search your meter’s Modbus register list at www.schneider-electric.com to
download the Modbus map.
Time of day mode overview
You can use this mode to create a tariff schedule that specifies where the meter stores
energy or input metered data, based on the time of year (month, day), the type of day
(every day, weekend, weekday or a specific day of the week), or time of day. The data
collected from the different tariffs can then be used in energy audits or similar costing
and budget planning purposes.
Tariff validity
A valid tariff has certain conditions and limitations:
• Each tariff must cover a unique time period (tariffs cannot overlap) but there can be
periods with no tariff.
• Any number of tariffs, from none to the maximum number of tariffs, can be applied.
• Time of day tariffs do not adjust for daylight savings time.
• Time of day tariffs include February 29th in leap years (however, it is not
recommended to have February 29th as a start or end date, as that tariff would be
invalid for non-leap years.
• Except for leap years, tariff dates are not year-specific; if you wanted to create a
tariff that starts on the first Monday in August, you need to enter the date for that
year, then manually update the tariff information for the subsequent years.
• DST (daylight savings time) is not supported by the meter.
Tariff creation method
Your device performs validation checks as you enter tariff information; it prompts you to
change the information that you have entered or set the tariff to disabled if the tariff
configuration is invalid. These checks can include:
• Start and end times must be different (for example, you cannot create a tariff that
starts at 02:00 and also ends at 02:00).
• Start time can only be earlier than end time for tariffs that are applied every day.
You can create a daily tariff that starts at 06:00 and ends at 02:00, but these times
are only valid for the Everyday tariff and invalid for the other tariff types.
• Start day must be earlier than end day if the days are in the same month. You
cannot create a tariff that starts June 15 and ends June 12.
There are two methods of creating tariffs:
• Time of year tariffs divide the year into multiple sections (usually seasons), where
each section has one or more day types. For example, an eight tariff configuration
using this method could have Spring, Summer, Fall and Winter seasons that also
use different weekend and weekday tariffs.
• Daily tariffs can divide days by day of the week, a weekday, a weekend, or every
day, and can specify the time of day. For example, an eight tariff configuration could
have every day in the year divided into three-hour tariff periods or could have four
tariffs for weekends and four tariffs for weekdays.