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Siemens Modbus register maps

Updated 28 October 2026

5 Siemens models, 541 registers in all, each re-typed from Siemens’s own free documentation and checked against it.

• Energy meter

  Siemens SENTRON PAC2200

  SENTRON 7KM PAC2200 Modbus TCP and Modbus RTU variants (5 A and 65 A), per Equipment Manual 12/2022.

  146 registers · 19 writable · TCP/RTU
  Also known as: 7KM PAC2200
• Power meter

  Siemens SENTRON PAC3200

  SENTRON PAC3200 (7KM2111/7KM2112), Ethernet port and optional PAC RS485 expansion module, per manual edition 02/2008.

  179 registers · 40 writable · TCP/RTU
  Also known as: 7KM2112-0BA00-2AA0, 7KM2112-0BA00-3AA0, 7KM2111-1BA00-3AA0, 7KM PAC3200
• Variable frequency drive

  Siemens SINAMICS G120 / G120C (Modbus RTU)

  SINAMICS G120 with an RS485 Control Unit (CU230P-2 HVAC/BT, CU240B-2, CU240E-2 / -2 F, CU250S-2), G120C USS/MB and G110M CU240M USS, firmware V4.7, per Fieldbuses function manual A5E34229197B AA. Not SINAMICS G120X, which has its own documentation.

  56 registers · 18 writable · RTU
  Also known as: G120C USS/MB, CU230P-2 HVAC, CU230P-2 BT, CU240B-2, CU240E-2, CU240E-2 F, CU250S-2, G110M CU240M USS, G120P
• Variable frequency drive

  Siemens SINAMICS V20 inverter (Modbus RTU)

  SINAMICS V20 basic inverters (1AC 230 V 6SL3210-5BB.. and 3AC 400 V 6SL3210-5BE..) using the built-in RS485 port with P2023 = 2 (Modbus), per operating instructions A5E34559884-006 (11/2016).

  107 registers · 38 writable · RTU
  Also known as: V20, 6SL3210-5BB, 6SL3210-5BE
• EV charger

  Siemens VersiCharge AC series wallbox (Modbus map)

  VersiCharge AC series chargers with firmware V2.135 or later (per-register minimum firmware is given in the source).

  53 registers · 7 writable · RTU/TCP
  Also known as: VersiCharge, VersiCharge AC

Siemens: default communication settings

Factory defaults as the manufacturer documents them. Change one setting at a time on site and write down what you changed. Word order applies to 32-bit values; the addressing column says how the manufacturer prints register numbers (every map on this site also gives the 0-based wire address).