Version: 1.0-06-24-24
SunSpec Modbus Conformance for IEEE 1547-2018 Test Procedures SunSpec Specification
Abstract
This document specifies the conformance test procedures for compliance with the requirements specified in the SunSpec Device Information Model Specification and the associated specific SunSpec information model specifications.
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Prepared by the SunSpec Alliance
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Version | Date | Comments |
1.0 | 07-08-2024 | Initial Release |
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Introduction 7
Test Procedures 8
Test Inputs 8
Test Categories 8
General Device Tests 9
General SunSpec Model Tests 9
MOD-4 – Mandatory Points 9
Curve Tests 10
Reversion Tests 10
Scale Factor Test 10
Procedure 10
Modbus Protocol Tests 10
Exception Generation Tests 10
Index of Tables
Table 1 - General Device Tests 9
Table 2 - General SunSpec Model Tests 9
Table 3 - General Curve Tests 11
Table 4 - Reversion Tests 12
Table of Figures
No table of figures entries found.
1 Introduction
This document specifies the SunSpec Modbus test procedures for IEEE 1547-2018
Conformance testing. These tests are in addition to the common SunSpec Modbus
Conformance test procedures specified in SunSpec Modbus Conformance Test Procedures.
2 Test Procedures
This section provides the test procedures for SunSpec Modbus compliance. 3
2.1 Test Inputs
SunSpec Modbus compliance testing for a device is based on the functionality supported by the
device. The device protocol implementation conformance statement (PICS) is used to specify
the SunSpec Modbus functional content.
The device PICS is an Excel workbook that specifies the SunSpec models and points that are
supported in the implementation along with the supported value ranges associated with each
adjustable point. A SunSpec Modbus PICS template can be obtained from the SunSpec
Alliance.
Due to the detailed nature of the PICS content, the SunSpec SVP Dashboard software,
available at no cost to SunSpec member companies, can be used to generate an initial PICS for
a device implementation. The SVP Dashboard probes the contents of the device through the
SunSpec Modbus interface and creates an initial PICS workbook based on the content found in
the device. The generated PICS workbook must then be updated to provide details that were
not able to be discovered during the initial discovery process.
Only SunSpec standardized models are considered during certification testing. Any additional
vendor-specific models must conform to SunSpec information modeling rules to the extent that
they do not inhibit discovery and use of the standardized model supported in the device.
SunSpec Modbus certification profiles specify conformance criteria for the specific profile
including required models, points, and value ranges that must be supported. Profiles are
developed for specific use cases. For example, the SunSpec Modbus profile for IEEE 1547-
2018 is used to create an inverter interface that complies with the IEEE 1547-2018 standard.
The standard SunSpec Modbus certification testing is performed, and profile requirements are
then matched to testing results to determine which profiles the device is in conformance with. 27
2.2 Test Categories
The SunSpec Modbus conformance tests fall into the following general categories: general
device tests, general model tests, curve tests, reversion tests, and Modbus protocol tests.
General device tests are performed once for a device.
General model tests are performed once for each SunSpec model implemented in the device.
Curve tests are performed for each curve-based model implemented in the device.
Reversion tests are performed for each reversion timer implemented in models contained in the
device.
Modbus protocol tests are performed once for a device.
5
2.4 General SunSpec Model Tests
The following tests must be performed for each SunSpec supported standardized model
specified in the PICS. 9
Test | Description |
MOD-1 | Model Implementation (Same as SunSpec Modbus Conformance Test Procedures) |
MOD-2 | Model Read (Same as SunSpec Modbus Conformance Test Procedures) |
MOD-3 | Point Write (Same as SunSpec Modbus Conformance Test Procedures) |
MOD-4 | Mandatory Points |
10 Table 2 - General SunSpec Model Tests
11
2.4.1 MOD-4 – Mandatory Points
This test validates all the points required for IEEE 1547 implementation are present in the device.
The list of these points can be found in the SunSpec Modbus IEEE 1547-2018 Profile
Specification and Implementation Guide.
2.4.1.1 Procedure
1. For each model, read the point in the model.
2. Compare the point to the list of mandatory points for IEEE 1547 implementation.
3. Verify all the required points are implemented in the model.
4. Verify every required model is implemented. 21
There can be additional optional points and models in the SunSpec Modbus that are not listed in
the IEEE 1547-2018 Profile Specification.
24
2.6 Reversion Tests
These tests MUST be performed as specified in the SunSpec Modbus Conformance Test
Procedures.
8
2.7 Scale Factor Test
The scale factor test verifies the scale factors are valid and in the correct range.
2.7.1 Procedure
For each implemented point that has a scale factor:
1. Read the corresponding scale factor value.
2. Verify the scale factor value lies in the acceptable range to meet the IEEE 1547
requirements based on the data type of the corresponding point. 16
2.8 Modbus Protocol Tests
These tests MUST be performed as specified in the SunSpec Modbus Conformance Test
Procedures.
20
21
2.9 Exception Generation Tests
These tests MUST be performed as specified in the SunSpec Modbus Conformance Test
Procedures.
