I see no data after connecting. What should I check first?

Verify that the RS-485 wiring polarity (A/B) is correct and that the baud rate on both the PAC3100 and the gateway is set to 19200. Also confirm the Modbus slave address in ModbusCloud matches the address configured on the meter.

Why do some register values show as zero or NaN?

The PAC3100 uses float32 encoding across two consecutive registers. If the byte order or word order is mismatched, values may appear as zero or NaN. The template is preconfigured for the PAC3100 default byte order, so make sure no manual byte-swap settings have been changed on the gateway.

Can I connect multiple PAC3100 meters on the same RS-485 bus?

Yes. Assign each meter a unique Modbus slave address via its front panel. In ModbusCloud, create a separate device entry for each meter using the same template but with the corresponding slave address.

Do I need a specific firmware version on the PAC3100?

The Modbus register map used by this template is consistent across standard PAC3100 firmware versions. If you have a very early hardware revision, check the Siemens documentation to confirm that all 70 registers are available.

Free Modbus template: Siemens Sentron PAC3100 Power meter 3 phase

Name: Siemens Sentron PAC3100 Power meter 3 phase
Brand: Siemens
SKU: ae6cb040-6847-45e0-8902-1a8a7412e6a9

This template reads 3-phase power metering data from a Siemens Sentron PAC3100 via Modbus RTU. It covers voltage, current, active and reactive power, power factor, and frequency per phase and as totals, including min/max statistics. All registers are read-only.

Registers (70)

70 read / 0 write

Name	Address	Function	Type	Unit	Access
Voltage L1-N	1	FC03	float32	V	R
Voltage L2-N	3	FC03	float32	V	R
Frequency	39	FC03	float32	Hz	R
Voltage L3-N	5	FC03	float32	V	R
Voltage L1-L2	7	FC03	float32	V	R
Voltage L3-L1	11	FC03	float32	V	R
Current L1	13	FC03	float32	A	R
Current L2	15	FC03	float32	A	R
Current L3	17	FC03	float32	A	R
Apparent Power L1	19	FC03	float32	VA	R
Apparent Power L2	21	FC03	float32	VA	R
Apparent Power L3	23	FC03	float32	VA	R
Active Power L1	25	FC03	float32	W	R
Active Power L2	27	FC03	float32	W	R
Active Power L3	29	FC03	float32	W	R
Reactive Power L1	31	FC03	float32	var	R
Reactive Power L2	33	FC03	float32	var	R
Reactive Power L3	35	FC03	float32	var	R
Neutral Current	37	FC03	float32	A	R
Total Apparent Power	47	FC03	float32	VA	R
Total Active Power	49	FC03	float32	W	R
Total Reactive Power	51	FC03	float32	var	R
Power Factor cos φ	53	FC03	float32		R
Max Voltage L1-N	55	FC03	float32	V	R
Max Voltage L2-N	57	FC03	float32	V	R
Max Voltage L3-N	59	FC03	float32	V	R
Max Voltage L1-L2	61	FC03	float32	V	R
Max Voltage L2-L3	63	FC03	float32	V	R
Max Voltage L3-L1	65	FC03	float32	V	R
Max Current L1	67	FC03	float32	A	R
Max Current L2	69	FC03	float32	A	R
Max Current L3	71	FC03	float32	A	R
Max Apparent Power L1	73	FC03	float32	VA	R
Max Apparent Power L2	75	FC03	float32	VA	R
Max Apparent Power L3	77	FC03	float32	VA	R
Max Active Power L1	79	FC03	float32	W	R
Max Active Power L2	81	FC03	float32	W	R
Max Active Power L3	83	FC03	float32	W	R
Max Reactive Power L1	85	FC03	float32	var	R
Max Reactive Power L2	87	FC03	float32	var	R
Max Reactive Power L3	89	FC03	float32	var	R
Max Neutral Current	91	FC03	float32	A	R
Max Frequency	93	FC03	float32	Hz	R
Max Total Apparent Power	101	FC03	float32	VA	R
Max Total Active Power	103	FC03	float32	W	R
Max Total Reactive Power	105	FC03	float32	var	R
Min Voltage L1-N	109	FC03	float32	V	R
Min Voltage L2-N	111	FC03	float32	V	R
Min Voltage L3-N	113	FC03	float32	V	R
Min Voltage L1-L2	115	FC03	float32	V	R
Min Voltage L2-L3	117	FC03	float32	V	R
Min Voltage L3-L1	119	FC03	float32	V	R
Min Current L1	121	FC03	float32	A	R
Min Current L2	123	FC03	float32	A	R
Min Current L3	125	FC03	float32	A	R
Min Apparent Power L1	127	FC03	float32	VA	R
Min Apparent Power L2	129	FC03	float32	VA	R
Min Apparent Power L3	131	FC03	float32	VA	R
Min Active Power L1	133	FC03	float32	W	R
Min Active Power L2	135	FC03	float32	W	R
Min Active Power L3	137	FC03	float32	W	R
Min Reactive Power L1	139	FC03	float32	var	R
Min Reactive Power L2	141	FC03	float32	var	R
Min Reactive Power L3	143	FC03	float32	var	R
Min Neutral Current	145	FC03	float32	A	R
Min Frequency	147	FC03	float32	Hz	R
Min Total Apparent Power	155	FC03	float32	VA	R
Min Total Active Power	157	FC03	float32	W	R
Min Total Reactive Power	159	FC03	float32	var	R
Max Power Factor cos φ	107	FC03	float32		R

Siemens Sentron PAC3100 Power meter 3 phase

Overview

Key readings

Use cases

Installation

Things to watch for

Registers (70)

Working with Modbus in your projects?

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