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Modbus RTU to IEC104 protocol conversion


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
iec104 1 1000 IEC 60870-5-104 slave 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:

  1. Download and run WCC Excel Utility;
  2. Select Excel file from your computer and click Convert;
  3. Check if no events in red color occur. If so, edit Excel file according to event text and repeat Step 2;
  4. Enter Host and credentials of WCC Lite and click Upload configuration.


  1. ABB meter manual Download
  2. WCC Excel Utility Download

  3. Example of configuration file Download