Schneider Electric EasyLogic EM6400NG+

Compatibility

Compatible with EpiSensor Edge over Modbus RTU

The EM6400NG+ RS-485 references are compatible with EpiSensor Edge over Modbus RTU, read through a ZMB-31 Modbus Interface or a Gateway serial port. Schneider documents RS-485 Modbus RTU on these references and publishes a register list with an EM6400 NG column, data types, units and a product ID register that identifies the meter.

RS-485 references only (METSEEM6400NGRSCL1, METSEEM6400NGRSCL5 and METSEEM6400NGRSCL2); the METSEEM6400NGPOCL1 and POCL5 have a pulse output instead of RS-485. Register numbers come from Schneider's EM6400 and PM2xxx register list v1050_6. Site check: confirm CoM is set to On, not RTFT (Retrofit), and that the product ID reads 15511 before adding points. Read-only monitoring: no writes to setup or reset registers.

Connect it with

• Modbus Interface ZMB-3X From €399 ex VAT Configure
• Gateway ZGW-20 From €899 ex VAT Configure

Models

Specifications

The EM6400NG+ is a compact 96 × 96 mm panel meter with a three-line LED display and three buttons, reading its currents through external CTs. Three of the five commercial references carry an RS-485 Modbus RTU port, so the first job on site is to read the commercial reference on the label or the meter model on the Diag screen.^1, 2

References with Modbus

METSEEM6400NGRSCL1 (class 1), METSEEM6400NGRSCL5 (class 0.5S) and METSEEM6400NGRSCL2 (class 0.2); METSEEM6400NGPOCL1 and POCL5 have a pulse output only^1, 2

Current inputs

1 A or 5 A CT secondary; CT primary 1 to 32767 A; starting current 5 mA; 12 A continuous withstand¹

Voltage inputs

35 to 480 V L-L (277 V L-N) at CAT III, up to 600 V L-L (347 V L-N) at CAT II; use VTs above the direct-connect limit^1, 2

Meter accuracy

Active energy class 1, 0.5S or 0.2 by reference (IEC 62053-21 and IEC 62053-22) at 5 A nominal CTs. For reactive energy the manual's feature summary gives class 2.0 on the class 1 references and 1.0 on the class 0.5S references, while its specification tables give class 2 to IEC 62053-23 (±1%) for every reference. IEC 61557-12 PMD classes apply from firmware 1.3.0. The installed CTs and wiring add their own error.^1, 2

RS-485

Two-wire on D1 (+) and D0 (-); 4800, 9600, 19200 or 38400 baud; even, odd or no parity (two stop bits with none); address 1 to 247; up to 32 devices and 900 m; straight-line topology; 2.5 kV RMS isolation^1, 2

Serial defaults

The user manual gives Modbus RTU, address 1, 19200 baud and even parity. The shared register list shows 9600 baud as its default code, so read the installed values on the meter.^1, 3

Housing

96 × 96 × 73 mm maximum, about 600 g, panel up to 6 mm thick, vertical mounting¹

Control power

44 to 277 V AC or DC ± 10%; 45 to 65 Hz on AC^1, 2

Environment

-10 to 60 °C operating; 5% to 95% RH non-condensing; front IP51 (IP54 or IP65 with an optional gasket kit), body IP30; indoor only, not for wet locations^1, 2

Unavailable values

FLOAT32 0xFFC00000; INT64 0x8000000000000000³

Interface

Documented measurements and integration boundaries for EasyLogic EM6400NG+.

• Product ID at register 90: INT16U, one register; 15511 on an EM6400NG with RS-485. The model register at 50 holds the text EM6400NG.
• Current A, B and C at registers 3000, 3002 and 3004, neutral at 3006 and average at 3010: FLOAT32, two registers each, in A. The manual states that the meter calculates neutral current rather than measuring it.
• Voltage A-B, B-C and C-A at 3020, 3022 and 3024 with the average at 3026; A-N, B-N and C-N at 3028, 3030 and 3032 with the average at 3036: FLOAT32 in V. Line-to-neutral values are reported only where the wiring connects them.
• Active power A, B and C at 3054, 3056 and 3058, total at 3060: FLOAT32 in kW. Reactive power A to total at 3062 to 3068 in kVAR, apparent power A to total at 3070 to 3076 in kVA.
• Power factor A, B, C and total at 3078 to 3084 in Schneider's four-quadrant encoding (range -2 to 2). Register 3192 holds the total as a plain FLOAT32 from -1 to 1, marked IEC standard in the register list; 3194 is the IEEE form.
• Frequency at 3110: FLOAT32 in Hz, range 42 to 70.
• Active energy delivered (into the load) at 3204 and received at 3208: INT64, four registers, in Wh. Reactive energy delivered at 3220 in VARh and apparent energy delivered at 3236 in VAh. FLOAT32 copies in kWh start at 2700 (delivered) and 2702 (received).
• Present active power demand at 3766 and peak demand at 3770: FLOAT32 in kW. THD of current A, B and C at 21300, 21302 and 21304 and of voltage A-N, B-N and C-N at 21330, 21332 and 21334: FLOAT32 in %.
• Unavailable data reads 0xFFC00000 for FLOAT32 and 0x8000000000000000 for INT64; record it as missing, not zero.
• Communication settings sit at 6500 to 6503 and the power system, VT and CT setup at 2016 to 2031. The register list marks them RWC: they change only through Schneider's command interface. Keep them out of a monitoring poll.

Setup

1. Identify the reference and firmware

   Read the commercial reference on the label: only METSEEM6400NGRSCL1, RSCL5 and RSCL2 have RS-485. Hold Down and OK for 2 seconds to open Diag and record the meter model, serial number and OS version. Confirm the power system, CT ratio and any VT ratio with the installer.

2. Read the serial settings

   The Diag communication screen shows the unit ID, baud rate and parity. Check in Setup that CoM is On, not OFF or RTFT (Retrofit, which switches the port to a legacy data model). The manual gives address 1, 19200 baud and even parity as defaults; with no parity the meter uses two stop bits. Set the Edge serial client or the ZMB-31 to the installed values.

3. Wire the RS-485 segment

   Connect D1 (+) and D0 (-) with shielded twisted pair in a straight line with no loop or ring, and ground the shield at one end only. Fit a 120 Ω, 0.5 W terminator at the ends of the segment where needed, and stay within 900 m and 32 devices.

4. Read the product ID

   Send one FC03 read of register 90. The register list does not state the address offset, so start with zero-based PDU address 89 (0x0059), the register number minus one. Expect 15511; if that read does not return it, send 0x005A (90) instead and use the register numbers unchanged from then on.

5. Add frequency, then the measurements

   Read frequency at register 3110 as two registers (0x0C25 if the product ID answered at 0x0059, 0x0C26 if it answered at 0x005A) and decode one FLOAT32. It must land near 50 or 60 Hz; use it to settle the word order, because the register list does not state one. Then add current at 3000, voltage at 3020 or 3028, total active power at 3060 in kW and energy at 3204 as INT64 Wh, with the same offset, comparing each with the display.

6. Keep the poll read-only

   Communication, setup and reset values change through Schneider's command interface. Leave those registers out of the Edge poll, and change the default 0000 password, as the manual recommends, so the meter cannot be reconfigured from the front panel without it.

Common questions

Can every EM6400NG+ be read over Modbus?

No. Schneider lists five references. METSEEM6400NGRSCL1, RSCL5 and RSCL2 have RS-485 Modbus RTU; METSEEM6400NGPOCL1 and POCL5 use the same two terminals as a pulse output and have no Modbus port.^1, 2

Is the EM6400NG+ register list the same as the EM6400NG list?

Schneider publishes one register list for the EM6400, PM2100 and PM2200 with a column for the EM6400 NG, attached to an FAQ for the METSEEM6400NGRSCL2. The meter's model register reads EM6400NG and ION Setup calls it the EM6400NG series, so use that column for the RS-485 references named here.^1, 3

Is register 3110 the address sent on the bus?

The register list gives register numbers and does not state the offset. Start with 3109 (0x0C25), the register number minus one. The product ID read shows which convention your meter and client use: if 15511 comes back only at 0x005A rather than 0x0059, send 3110 (0x0C26) for frequency and use every register number unchanged.³

What does RTFT (Retrofit) change?

On the RS-485 references, the CoM setting has On, OFF and RTFT. Retrofit switches the port to a legacy communication data model. The register numbers on this page come from Schneider's current EM6400 and PM2xxx list, so CoM must be On.^1, 2

Which energy register should I log?

Active energy delivered at 3204 is a four-register INT64 in Wh; 2700 is a two-register FLOAT32 copy in kWh, which keeps only about seven significant digits. Use the INT64 for totals. The manual notes that every energy value resets when any of them overflows at 999999999.999 on the selected energy scale, so handle a sudden drop as a reset.^1, 3

Does the EM6400NG+ have Modbus TCP?

No. Schneider documents one RS-485 port running Modbus RTU. Edge reads it through a ZMB-31 Modbus Interface or a Gateway serial port.¹

Does class 0.2 describe the whole installation?

It is the METSEEM6400NGRSCL2's stated active-energy class at 5 A nominal CTs. CT accuracy and ratio, wiring and the measurement boundary all affect the system result.¹