ORNO OR-WE-517

Compatibility

Compatible with EpiSensor Edge over Modbus RTU

ORNO documents RS-485 Modbus RTU for the OR-WE-517 and publishes a register list with function codes, hexadecimal addresses, lengths, Float32 data and units. The meter is compatible with EpiSensor Edge over Modbus RTU, through a ZMB-31 Modbus Interface or the Gateway's serial port.

ORNO OR-WE-517 (EAN 5902560322422), using ORNO's OR-WE-517 register list and the 07/2023 user manual as the starting point. The list does not name a word order, so compare the first read with the meter display. The OR-WE-516 and other OR-WE meters are outside this guide. Read-only monitoring: no ID, baud rate, tariff, clock or combined-code writes.

Connect it with

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

Models

Specifications

A three-phase, four-wire meter for direct connection with four independent tariffs set over the RS-485 port, an internal clock, four-quadrant active and reactive energy, an S0 pulse output and an infrared optical port. Counters are held in EEPROM.^1, 2, 3

Model

ORNO OR-WE-517, EAN 5902560322422.³

Voltage

3 × 230/400 V, 50 Hz, three-phase four-wire.^2, 4

Current

Starting current 0.02 A, Imin 0.25 A, Ib 5 A, Imax 80 A.²

Accuracy and approval

Class B to EN 50470-1/3. MID EU type-examination certificate 0120/SGS0278 (module B), issued by SGS United Kingdom on 16 May 2017 and valid until 14 March 2027, naming software V1.01.^2, 4

RS-485

Modbus RTU on terminals 21 (A) and 20 (B). Default meter ID 1, 9600 bit/s, 8 data bits, even parity, 1 stop bit; 1200, 2400 and 4800 bit/s are optional.^1, 2

Other interfaces

S0 open-collector output on 24 (+) and 23 (-), 12 to 27 V DC, up to 27 mA, 90 ms pulses, 1000 imp/kWh by default (1, 10, 100 or 1000 settable). Infrared port at 4800 bit/s, 7 data bits.²

Own consumption

Up to 8 VA and 0.4 W.²

Mounting

35 mm DIN rail (TH-35); 76 × 100 × 65 mm in the manual's dimension drawing. Terminals take up to 35 mm².²

Environment

Operation -25 to +55 °C, humidity up to 75%, IP51, protection class II, indoor, mechanical class M1 and electromagnetic class E2.^2, 4

Interface

Documented measurements and integration boundaries for OR-WE-517.

• Addresses are hexadecimal PDU addresses for FC03, and ORNO gives lengths in bytes: a length of 4 is two registers. The Register No. column is a row count, not an address.
• L1, L2 and L3 voltage at 0x000E, 0x0010 and 0x0012: Float32, V.
• Grid frequency at 0x0014: Float32, Hz.
• L1, L2 and L3 current at 0x0016, 0x0018 and 0x001A: Float32, A.
• Total active power at 0x001C, then L1 to L3 at 0x001E, 0x0020 and 0x0022: Float32, kW.
• Total reactive power at 0x0024 (kvar), total apparent power at 0x002C (kVA) and total power factor at 0x0034, each followed by its L1 to L3 values.
• Total active energy at 0x0100, forward active energy at 0x0108 and reverse active energy at 0x0110: Float32, kWh, each followed by its L1 to L3 counters.
• Total, forward and reverse reactive energy at 0x0118, 0x0120 and 0x0128: Float32, kvarh.
• Tariff energy: T1 total, forward and reverse active energy at 0x0130, 0x0132 and 0x0134; T2 from 0x013C, T3 from 0x0148 and T4 from 0x0154 in the same order, each followed by three reactive counters.
• Identity and settings: serial number at 0x0000 (two registers), meter ID at 0x0002, baud rate at 0x0003, software version at 0x0004 and combined code at 0x000B.

Setup

1. Identify the meter

   Read OR-WE-517 on the front label and note the software version shown on the display (the certificate names V1.01). An OR-WE-516 looks the same but has no tariffs and is outside this guide.

2. Read the serial settings from the display

   Step through the display to the Id and bd screens for the Modbus ID and baud rate. The defaults are ID 1 and 9600 bit/s with 8 data bits, even parity and 1 stop bit. Enter the same values in the Edge serial client.

3. Wire the RS-485 pair

   Connect A to terminal 21 and B to terminal 20 with a twisted pair, and give each meter on the bus its own ID.

4. Make one voltage read

   Send FC03 to address 0x000E for two registers and decode the four bytes as Float32 high word first, as in the worked read below. Compare the result with Voltage L1 on the display.

5. Add the points you need

   Add current, power and energy registers from the same list. Log forward and reverse active energy separately where the site can export, and keep FC06 and FC16 writes out of the polling configuration.

Common questions

Is 000E a decimal register number?

No. ORNO prints the addresses in hexadecimal, as entries such as 001A and 010E show. Send 0x000E, decimal 14, as the PDU address. A tool that asks for one-based register numbers needs 15.¹

Which energy register measures consumption?

Forward active energy at 0x0108 and reverse active energy at 0x0110 are separate counters, so read those two when the site can export. Total active energy at 0x0100 sits beside a combined code at 0x000B that ORNO's list does not explain, so compare 0x0100 with the display before relying on it.¹

How do I read the four tariffs?

Each tariff has its own block of six Float32 counters: T1 from 0x0130, T2 from 0x013C, T3 from 0x0148 and T4 from 0x0154, in the order total, forward and reverse active energy, then total, forward and reverse reactive energy. The tariff time intervals are set over RS-485 and are read at 0x0300 to 0x0360.^1, 3

Does the list include writable registers?

Yes. ORNO documents FC06 writes for the meter ID, baud rate, CT rate, combined code, holiday and weekend tariff and display cycle time, and FC16 writes for the S0 rate, clock, tariff intervals and time zone. A monitoring configuration should read with FC03 only.¹

Does a 32-bit float energy counter lose resolution?

Yes, gradually. A Float32 holds about seven significant digits: above about 131,000 kWh the counter moves in steps of about 0.016 kWh, and above about 1,050,000 kWh in steps of 0.125 kWh. Store each value as received and calculate consumption over intervals rather than from tiny differences.¹