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B: Modbus Map and Retrieving Logs

Doc# E149701 MM-40

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Notes

FS = CT numerator * CT multiplier

FS = PT numerator * PT multiplier

FS = 60 (or 50)

FS = 1.0

FS = 100.0

FS = 180.0

All registers not explicitly listed in the table read as 0. Writes to these registers will be accepted but won't actually change the register (since it doesn't exist).

Meter Data Section items read as 0 until first readings are available or if the meter is not in operating mode. Writes to these registers will be accepted but won't actually change the register.

Each identifier is a Modbus register. For entities that occupy multiple registers (FLOAT, SINT32, etc.) all registers making up the entity must be listed, in ascending order. For example, to log phase A volts, VAs,

voltage THD, and VA hours, the register list would be 0x3E7, 0x3E8, 0x411, 0x412, 0x176F, 0x61D, 0x61E and the number of registers (0x7917 high byte) would be 7.

Writing this register causes data to be saved permanently in nonvolatile memory. Reply to the command indicates that it was accepted but not whether or not the save was successful. This can only be determined after

Reset commands make no sense if the meter state is LIMP. An illegal function exception will be returned.

Energy registers should be reset after a format change.

Register valid only in programmable settings update mode. In other modes these registers read as 0 and return an illegal data address exception if a write is attempted.

Meter command registers always read as 0. They may be written only when the meter is in a suitable mode. The registers return an illegal data address exception if a write is attempted in an incorrect mode.

If the password is incorrect, a valid response is returned but the command is not executed. Use 5555 for the password if passwords are disabled in the programmable settings.

M denotes a 1,000,000 multiplier.

3 phase power FS = CT numerator * CT multiplier * PT numerator * PT multiplier * 3 [ * SQRT(3) for delta hookup]

single phase power FS = CT numerator * CT multiplier * PT numerator * PT multiplier [ * SQRT(3) for delta hookup]

Entities to be monitored against limits are identified by Modbus address. Entities occupying multiple Modbus registers, such as floating point values, are identified by the lower register address. If any of the 8 limits is

unused, set its identifier to zero. If the indicated Modbus register is not used or is a nonsensical entity for limits, it will behave as an unused limit.

There are 2 setpoints per limit, one above and one below the expected range of values. LM1 is the "too high" limit, LM2 is "too low". The entity goes "out of limit" on LM1 when its value is greater than the setpoint. It

remains "out of limit" until the value drops below the in threshold. LM2 works similarly, in the opposite direction. If limits in only one direction are of interest, set the in threshold on the "wrong" side of the setpoint. Limits

are specified as % of full scale, where full scale is automatically set appropriately for the entity being monitored:

current

voltage

THD not available shows 10000 in all THD and harmonic magnitude and phase registers for the channel. THD may be unavailable due to low V or I amplitude, delta hookup (V only), or V-switch setting.

Option Card Identification and Configuration Block is an image of the EEPROM on the card

A block of data and control registers is allocated for each option slot. Interpretation of the register data depends on what card is in the slot.

Measurement states: Off occurs during programmable settings updates; Run is the normal measuring state; Limp indicates that an essentail non-volatile memory block is corrupted; and Warmup occurs briefly

(approximately 4 seconds) at startup while the readings stabilize. Run state is required for measurement, historical logging, demand interval processing, limit alarm evaluation, min/max comparisons, and THD

calculations. Resetting min/max or energy is allowed only in run and off states; warmup will return a busy exception. In limp state, the meter reboots at 5 minute intervals in an effort to clear the problem.

frequency

power factor

percentage

angle

Limits evaluation for all entites except demand averages commences immediately after the warmup period. Evaluation for demand averages, maximum demands, and minimum demands commences at the end of the

first demand interval after startup.

Autoincrementing and function 35 must be used when retrieving waveform logs.

Depending on the V-switch setting, there are 15, 29, or 45 flash sectors available in a common pool for distribution among the 3 historical and waveform logs. The pool size, number of sectors for each log, and the

number of registers per record together determine the maximum number of records a log can hold.

S = number of sectors assigned to the log,

H = number of Modbus registers to be monitored in each historical record (up to 117),

R = number of bytes per record = (12 + 2H) for historical logs

N = number of records per sector = 65516 / R, rounded down to an integer value (no partial records in a sector)

T = total number of records the log can hold = S * N

T = S * 2 for the waveform log.

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