Schneider Electric PowerLogic PM5300 Series Dokumentacja Pobierz pdf (Strona 52)

Power Meter 750 63230-507-201A1

Appendix B—Register List 03/2007

SUPPORTED MODBUS COMMANDS

HOW SIGNED POWER FACTOR IS

STORED IN THE REGISTER

Each power factor value occupies one register. Power factor values are

stored using signed magnitude notation (see Figure B–1). Bit number 15,

the sign bit, indicates leading/lagging. A positive value (bit 15=0) always

indicates leading. A negative value (bit 15=1) always indicates lagging. Bits

0–9 store a value in the range 0–1,000 decimal. For example, the power

meter would return a leading power factor of 0.5 as 500. Divide by 1,000 to

get a power factor in the range 0 to 1.000.

Figure B– 1: Power factor register format

Table B– 8:

Command Description

0x03 Read holding registers

0x04 Read input registers

0x06 Preset single registers

0x10 Preset multiple registers

0x11

Report ID

Return String

byte 1: 0x11

byte 2: number of bytes following without crc

byte 3: ID byte = 250

byte 4: status = 0xFF

bytes 5+: ID string = PM710 Power Meter

last 2 bytes: CRC

0x2B

Read device identification, BASIC implementation (0x00, 0x01, 0x02 data),

conformity level 1,

Object Values

0x01: If register 4128 is 0, then “Merlin Gerin. If register 4128 is 1, then

“Square D”

0x02: “PM710”

0x03: “Vxx.yyy” where xx.yyy is the OS version number. This is the

reformatted version of register 7001. If the value for register 7001 is 12345,

then the 0x03 data would be “V12.345”

1023456789101112131415

00000

Sign Bit

0=Leading

1=Lagging

Unused Bits

Set to 0

Power Factor

in the range 100-1000 (thousandths)

1 2 ... 47 48 49 50 51 52 53 54 55 56 57 ... 67 68

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