Protocol-Specific Addressing

• The “Address” column is the most critical field when configuring an external tag.
• It serves as a unique coordinate defining exactly where SCADA will locate the data within the PLC’s memory.
• Every PLC manufacturer (Fultek, Siemens, Modbus, etc.) and protocol organizes its memory differently and uses different addressing logic. Therefore, the address format you enter in this column varies completely based on the driver you select.
  • For Fulmatic TCP (Fultek)
    • Symbolic addresses like D1.D10 (Data Block 1, Double Word 10), I 0.0 (Input 0.0), Q 0.1 (Output 0.1), M 0.3 (Marker 0.3).
  • For Modbus
    • Numerical addresses like 40001 (Holding Register 1), 00001 (Coil 1).
  • For Profinet (Siemens)
    • Symbolic addresses like DB1.DBW10 (Data Block 1, Word 10), I0.0 (Input 0.0), M10.2 (Marker 10.2).

Warning: Using an incorrect format will cause communication failure for that tag.

IMPORTANT: Refer to the Guide for the Correct Address Format

The examples above show only the most common formats. Each protocol has its own unique addressing structure, data type mappings (e.g., Word vs. DINT), and special settings.

For a successful connection, you must review the specific guide for the device you intend to connect to (e.g., Modbus TCP, Profinet, Melsec) found under the Protocol Guides section, which is the next part of this manual.