Schneider Easergy P5 Communication Protocol Complete Guide

CID: Description of the configured IED, including specific device configurations

SCD: System Configuration Description, including the communication configuration of the entire system

Configuration process:

Create system configuration from ICD file using CET850

Edit Dataset, Report Control Block (RCB), GOOSE Control Block (GoCB)

Generate CID file

Download CID files to the device through eSetup Easergy Pro

3.4 GOOSE Communication Configuration

GOOSE (General Object Oriented Substation Event) is a key technology for achieving fast communication between IEDs.

Publisher configuration:

Create a dataset and select the data attributes to be published (DA)

Configure GoCB, including multicast MAC address, retransmission time (fastest 4ms), maximum retransmission interval (heartbeat cycle)

The dataset size needs to be compatible with Ethernet frames

Subscription configuration:

Select the data attributes in the GOOSE message to subscribe to

Assign subscribed data attributes to GOOSE network inputs (NI)

Supports 128 binary GOOSE inputs and 8 analog GOOSE inputs

GOOSE Matrix:

Through the GOOSE matrix, GOOSE network inputs can be mapped to virtual inputs (VI 1-20) to achieve integration with relay application logic. The same network input can be mapped to multiple virtual inputs, and multiple network inputs can also be mapped to the same virtual input (for "OR" logical operations).

3.5 Performance and Compliance with Standards

The GOOSE performance of Easergy P5 meets the P2 level (<10ms) requirements of IEC 61850-5 and IEC 61850-10.

4. DNP3 Protocol: Reliable Data Collection and Control

DNP3 (Distributed Network Protocol) is a widely used data acquisition and control protocol in the power industry. Easergy P5, as a slave device, supports serial port mode and TCP/IP mode, with a maximum of 8 client connections.

4.1 Functional Features

Status polling and reporting: Supports polling static status values through Class 0, and reporting data change events by category (Class 1, 2, 3)

Measurement value polling: supports static measurement value polling, configurable dead zone value management measurement value event reporting

Remote control: supports control commands such as selection, operation, and direct operation, and supports two control models: direct control (DC) and pre selection operation (SBO)

Counter management: supports polling of counter values

Time synchronization: Supports time synchronization command requests, which can be synchronized through absolute time objects or last recorded time objects

File transfer: Supports the extraction of disturbance record files (COMTRADE), and supports operations such as opening, closing, reading, and obtaining file information

4.2 Technical Parameters

Maximum data link frame size: 292 bytes (send)/292 bytes (receive)

Maximum application layer fragment size: 2048 bytes (send)/2048 bytes (receive)

Link layer retry count: configurable 0-255

SBO timeout: 60 seconds

4.3 Data Mapping

Easergy P5 maps data to five object categories of DNP3:

Binary Input (BI)

Dual input (DBI)

Analog Input (AI)

Counter (CNTRS)

Binary Output (BO)

Each type of data point can be configured with a category, whether to generate a non request response (UR), and a dead zone value (AI).

5. Modbus protocol: an industrial universal communication standard

Easergy P5 supports Modbus as both a slave and master, meeting the needs of different application scenarios.

5.1 Modbus Slave

Transmission mode:

Serial RTU mode: RS-485 physical layer

TCP/IP mode: Ethernet, supports up to 3 IP addresses and 8 clients

Supported functional codes:

03: Read and hold register

04: Read input register

06: Writing a single register

07: Read abnormal status

08: Diagnosis

16: Write multiple registers

23: Read/write multiple registers

43/14: Read device identification

Event management:

Standard Modbus: Read events from hold registers 2101-2105, up to 49 latest events

PDM Modbus: Maintain FIFO buffer for 100 events, provide table descriptors and event lists

List of data points:

Standard Point List (Enable 'Enable Traditional Points' setting)

PDM point list (default), supports data types such as Float32, ∝, Uint32, etc

5.2 Modbus Master Station

The Modbus master function allows Easergy P5 to act as the master and read the analog and digital inputs and outputs of external Modbus I/O devices through the RS-485 bus.

Configuration parameters:

Analog input: up to 64 points, configurable address, register type, unit, scaling ratio, alarm threshold

Digital input: up to 18 points, configurable address, register/coil type, selected bit

Digital output: up to 16 points, configurable address and coil type

Application:

External analog inputs can be displayed on the HMI and linked with protection functions to achieve more complex automation logic.

6. IEC 60870-5-101/103 protocol: Traditional power communication

6.1 IEC 60870-5-101

This protocol is defined in unbalanced mode, where Easergy P5 operates as a controlled station (slave) and supports the following application functions:

Process data transmission

Event transmission

Command transmission

Total query

clock synchronization

Total points transmission

Transmission delay acquisition

Data Model: