Modbus RTU to IEC104 protocol conversion
Description
This article describes WCC Lite configuration steps to enable Modbus TCP protocol conversion to IEC 104.
First steps
Before you begin, make sure you have completed all physical installation work according to the manufacturer's installation instructions.
Set up your computer and connect Ethernet cable to WCC Lite ETH0 port. Login with default credentials and setup basic required settings (name, network, users, etc. ). You can find configuration tutorials in How to articles.
After setup, download configuration template from device (Protocol Hub → Configuration → Template configuration Download)
Or download configuration example from this article Files.
To prepare configuration fill information in both - Devices and Signals sheets:
Configure devices
Add connected ABB meter with Modbus RTU protocol required information:
| name | description | device_alias | enable | protocol | id | device | baudrate | databits |
| From ABB Meter | ABB B21 | B21 | 1 | Modbus RTU | 1 | PORT2 | 9600 | 8 |
| stopbits | parity | flowcontrol | scan_rate_ms | poll_delay_ms | poll_retry_count |
| 1 | none | none | 5000 | 200 | 3 |
Add SCADA working on IEC104 protocol required information:
| name | description | device_alias | enable | event_history_size | protocol | bind_address | host | port |
| To SCADA | iec104 | 1 | 1000 | IEC 60870-5-104 slave | 0.0.0.0 | 192.168.1.10 192.168.67.192 192.168.71.1 | 2404 |
| asdu_size | cot_size | ioa_size | rwt | swt | t1 | t2 | t3 | time_sync | sp_time | dp_time | me_time | message_size | cache_size |
| 2 | 2 | 3 | 8 | 12 | 45 | 30 | 200 | 1 | 1 | 1 | 0 | 249 | 100 |
You can find more options and descriptions of the settings in Device configuration article.
Configure signals
Add connected meter measurements information. Use meter manual for information and addresses (tag_job_todo).
| signal_name | device_alias | signal_alias | enable | tag_type | multiply | job_todo | tag_job_todo | number_type |
| Voltage | B21 | U | 1 | Normal | 0.1 | 03|5B|00|00|43 | 03|5B|00|00|02 | UNSIGNED32 |
| Current | B21 | I | 1 | Normal | 0.01 | 03|5B|00|00|43 | 03|5B|0C|00|02 | UNSIGNED32 |
| Active power | B21 | P | 1 | Normal | 0.00001 | 03|5B|00|00|43 | 03|5B|14|00|02 | SIGNED32 |
| Frequency | B21 | F | 1 | Normal | 0.01 | 03|5B|00|00|43 | 03|5B|2E|00|01 | UNSIGNED16 |
| Power factor | B21 | Cos | 1 | Normal | 0.001 | 03|5B|00|00|43 | 03|5B|3A|00|01 | SIGNED16 |
| Active import | B21 | E | 1 | Normal | 0.01 | 03|50|00|00|04 | 03|50|00|00|04 | UNSIGNED64 |
job_todo -Request to send according to modbus specification without device address and checksum;
tag_job_todo - a subset of job_todo field, exact address of measurement (tag)
Add IEC104 master signals information:
| signal_name | device_alias | signal_alias | source_device_alias | source_signal_alias | enable | tag_type | units | multiply | gi | common_address | info_address | data_type |
| Voltage | iec104 | tag-iec104-1001 | B21 | U | 1 | Normal | V | 1.0 | 1 | 1 | 1001 | 13 |
| Current | iec104 | tag-iec104-1002 | B21 | I | 1 | Normal | A | 1.0 | 1 | 1 | 1002 | 13 |
| Active power | iec104 | tag-iec104-1003 | B21 | P | 1 | Normal | kW | 1.0 | 1 | 1 | 1003 | 13 |
| Frequency | iec104 | tag-iec104-1004 | B21 | F | 1 | Normal | Hz | 1.0 | 1 | 1 | 1004 | 13 |
| Power factor | iec104 | tag-iec104-1005 | B21 | Cos | 1 | Normal | 1.0 | 1 | 1 | 1005 | 13 | |
| Active import | iec104 | tag-iec104-1006 | B21 | E | 1 | Normal | kWh | 1.0 | 1 | 1 | 1006 | 13 |
Other example with Rail350 meter in video
Upload configuration
After all devices and signals are configured it time to check and upload configuration using WCC Excel Utility:
- Download and run WCC Excel Utility;
- Select Excel file from your computer and click Convert;
- Check if no events in red color occur. If so, edit Excel file according to event text and repeat Step 2;
- Enter Host and credentials of WCC Lite and click Upload configuration.