PM8240
The PowerLogic PM8240 is a premium IEC 61000-4-30 Class A certified power quality analyser. With 512 MB of memory, 256 samples per cycle and comprehensive PQ analysis it produces power quality compliance reports for factories, hospitals and critical industrial facilities. K-factor supports transformer harmonic load assessment (IEEE C57.110). 44 register points are pre-defined in Argus.
| Standard Measurements | V/I/P/Q/S/PF/Hz — phase + total |
| THD Voltage | VTHD L1/L2/L3 — IEC 61000-4-7 |
| THD Current | ITHD L1/L2/L3 |
| K-Factor | KF L1/L2/L3 — IEEE C57.110 |
| Unbalance | V unbalance (%) · I unbalance (%) |
| Energy | kWh · Q1/Q4 kVArh · kVAh — import/export |
| PQ Standard | IEC 61000-4-30 Class A |
| Accuracy | Class 0.2S (IEC 62053-22) |
| Harmonic Resolution | 63rd harmonic — for every phase |
| Memory | 512 MB |
| Sampling | 256 sample/cycle |
| Communication | Ethernet Modbus TCP |
| Mounting | 96×96 mm panel front / DIN rail |
Integration with Argus EMS
The PM8240 connects to Argus EMS over Modbus TCP over Ethernet, and because a ready register template ships with the platform you do not have to work out a point map on site. The field agent polls the device every 60 seconds by default, writes the reading into a local queue first and then forwards it to the server over MQTT/TLS; nothing is deleted before the server acknowledges it. Hourly and daily summaries are derived from these raw readings, and the consumption and cost screens are fed from the same series.
| Protocol | Modbus TCP over Ethernet |
| Connection path | Directly over Modbus TCP (port 502) — no separate gateway is needed |
| Default polling period | 60 seconds (field agent) |
| Points in the ready template | 44 registers |
| Consumption calculation | Difference of the kWh import index over the period (MAX − MIN) |
| Data assurance | Local queue plus server acknowledgement; nothing is deleted before it is confirmed |
When Is This Model the Right Choice?
This is a power-quality class device: harmonic components, voltage events and event records are part of the measurement. Questions about reactive penalties, harmonic-driven heating or unexplained failures of sensitive equipment are answered from the records of this class.
The device serves Modbus TCP directly over Ethernet, so no gateway is needed. In exchange, each device needs an IP address on the network and a switch port inside the panel. If more than one master polls the same device at once — a building automation system alongside Argus EMS, for example — its concurrent connection limit has to be respected.