blue'Log XM/XC
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Modbus Power Control license blue'Log XC data sheet

Modbus Power Control
blue’Log XC

Item no. 557.008

Modbus interface for real-time process data exchange with the grid operator.

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Description

The Modbus Power Control interface is an open Modbus TCP interface. It facilitates the real-time process data exchange with the grid operator. If telecontrol protocols (IEC 60870-5-101/-104, IEC 61850 or DNP3) are used, the interface is the ideal connection between a protocol converter (for example programmable logic controller - PLC) and the telecontrol system of the grid operator.

Features

  • Modbus TCP interface

  • Setpoint commands given by the grid operator (active power curtailment, power factor (cos ϕ) control, reactive power control)

  • Interface for protocol converter of telecontrol protocols (IEC 60870-5-101 /-104, IEC 61850 or DNP3)

  • Switching between different methods for active / reactive power management

  • Setting of reference voltage for parallel shift of the characteristic curve Q (V)

  • Feedback (acknowledgement) of setpoint commands for signal monitoring

  • Feedback of electrical parameters measured at grid connection point (for example P, Q, cos φ, f, V, I)

Requirements

  • blue’Log XC with firmware ≥ 10.0.8

  • 557.008 Modbus Power Control blue’Log XC license. The license is issued for a specific blue’Log XM/XC. When ordering, provide the 14-digit hardware serial number of your data logger.

Modbus specification

Communication parameters

  • Slave ID (Client ID): 1

  • Port: 502

  • Delay: 1,000 ms

General register definition

  • If a device does not deliver a measured value, a missing value will be sent instead. See table “Data types” below.

    • Missing values int: 0x80000000 | float: 0x7FC00000

  • Read values: Function code 03 - Read holding registers

  • Write values: Function code 16 - Preset multiple registers

  • Register and byte order:

    • The word order is LOW register before HIGH register (Little Endian)

    • The byte order is HIGH byte before LOW byte (Big Endian) → 0xCCDDAABB

📗

Example

Write command of 10% setpoint for active power.

Built with the open source tool modpoll:

Write command of 10 percent setpoint for active power.
Data types

Abbreviation

Description

Missing values

U16

16-bit unsigned integer

0xFFFF

U32

32-bit unsigned integer

0xFFFFFFFF

I16

16-bit signed integer

0x8000

I32

32-bit signed integer

0x80000000

F32

32-bit float

0x7FC00000

String

  • String, ASCII encoding.

  • If the whole length of the field is used, then the end of the string will be filled with 0x00.

  • If a value (for example model name) does not fit in the register, then it will be cut off.

0x00

Interface registers

This PDF provides an overview of the Modbus Power Control registers (available in English only):
557008_Modbus-Power-Control_registers_en_2025-11-14.pdf

Note
The register list contains two separate sections:

  • Registers for the blue’Log XC without the Hybrid EMS licence.

  • Registers for the blue’Log XC with the Hybrid EMS licence.