Siemens SENTRON PAC4200

Compatibility

Compatible with EpiSensor Edge over Modbus TCP

Siemens publishes a PAC4200 system manual with built-in Modbus TCP, Float measurement offsets and functions 03 and 04. Edge reads the meter over Ethernet as a Modbus TCP client. The manual does not state the multi-register word order, so the setup procedure selects it once against the meter display.

Installed PAC4200 with the complete 7KM order code, firmware and expansion modules recorded. Site check: select the Float32 byte order from the frequency and voltage reads before adding points. Siemens names PAC4220 as the successor for relevant order codes; do not transfer a PAC3220 decoder to this meter.

Connect it with

• Gateway ZGW-20 From €899 ex VAT Configure
• Evaluation Gateway on a Raspberry Pi Edge with one device licensed Free Set up

Models

Specifications

The May 2019 manual documents Ethernet, Modbus TCP, web access, time synchronisation and an optional RS485 module. Appendix A.2.1 lists two-register Float measurements and permits functions 03 and 04. It does not explicitly state multi-register ordering; the setup procedure uses two display comparisons to select the decoder without assuming another meter’s representation.¹

Built-in network

10/100 Ethernet with Modbus TCP and HTTP web access^1, 2

Serial option

Optional PAC RS485 expansion module; module and slot-specific gateway settings apply¹

Measurement update

200 ms update for instantaneous values and energy according to the retained manual¹

Measurement scope

TRMS electrical values, power, energy, demand and harmonics^1, 2

Access controls

Password, hardware write protection, IP filtering and configurable Modbus TCP port are described in Siemens material^1, 2

Lifecycle

Legacy PAC4200 installed estate; check the exact order-code replacement record for PAC4220²

Interface

Documented measurements and integration boundaries for SENTRON PAC4200.

• Voltage, current, frequency, active, reactive and apparent power are two-register Float values; select the byte order once during commissioning.
• Potential import and export energy counters must preserve direction, tariff, unit and reset behavior from the exact firmware map.
• Power quality, harmonics, demand and diagnostic values must remain distinct from billing, settlement and protection evidence.
• No configuration or control write is approved by this guide.

Setup

1. Record the installed identity

   Capture the complete 7KM order code, firmware, serial number, supply variant, measurement wiring and every installed expansion module. Do not identify the meter from the PAC4200 family name alone.

2. Map the existing network

   Record the Ethernet address, Modbus TCP port, unit identifier, web access, time source and any RS485 expansion-module gateway use. Preserve existing metering, commissioning and security ownership.

3. Read frequency and voltage

   Use the May 2019 manual, Appendix A.2.1, pages 146–147. Function 03 or 04 reads line frequency at offset 55, voltage L1-N at 1, current L1 at 13 and total active power at 65. Each is a two-register Float in Hz, V, A or W respectively. Enter these published offsets in a zero-based client; a client requesting one-based register numbers needs 56, 2, 14 and 66. The frequency request PDU using function 04 is 04 00 37 00 02.

4. Prove a bounded read

   Capture both registers in one read. Try the four common IEEE 754 Float32 byte arrangements ABCD, CDAB, BADC and DCBA in the Modbus data decoder, using the returned bytes in their original order. Select the arrangement that agrees with frequency and L1-N voltage on the simultaneous meter display, then confirm total active power and its sign. Synthetic bytes 42 48 00 00 decode to 50 Hz in ABCD order; this illustrates the decoder and does not establish the PAC4200 wire order. Save the selected arrangement with the site point list.

5. Keep writes outside monitoring

   Use the meter's access controls and a read-only client design. Configuration changes, resets and gateway settings require a separate authorised commissioning procedure.

Common questions

Can Edge read an installed Siemens PAC4200 today?

Yes. Edge reads the built-in Modbus TCP interface with the published measurement offsets. Use the frequency and voltage read procedure on this page to select the decoder against the meter display, then configure a read-only point list.¹

Is a PAC4200 the same as a PAC4220 or PAC3220?

No. PAC4220 is named as a successor for relevant legacy PAC4200 order codes, while PAC3220 is a different family. Each meter needs its own order-code, firmware and interface evidence.²

Should Edge use the optional RS485 module?

Use the built-in Modbus TCP interface. The optional module, its slot and its client or gateway role are separate installed equipment, and this page does not reuse another module's settings.¹

Can PAC4200 monitoring data be used for settlement or protection?

This guide covers prospective owner-side operational monitoring only. Settlement, legal metrology, grid protection and compliance evidence require their own approved equipment and procedures.^1, 2