PM3250
The PowerLogic PM3250 is a dependable choice for industrial applications and mid-range energy monitoring projects. Measurement up to the 31st harmonic, 2DI/2DO and 256 KB of data memory strengthen its alarm and logging capacity.
| Voltage / Current | Phase-neutral, line-line, neutral current |
| Power | kW / kVAr / kVA — phase + total |
| Harmonics | Up to the 31st harmonic — V + I THD |
| Reactive Energy | Q1 kVArh + Q4 kVArh |
| Energy | kWh + kVArh + kVAh — import/export |
| Min/Max | Voltage, current, power — time stamped |
| Accuracy | Class 0.5S (IEC 62053-22) |
| Communication | RS485 Modbus RTU |
| Memory | 256 KB |
| I/O | 2 digital inputs · 2 digital outputs |
| Alarms | 35 configurable alarms |
| Mounting | 96×96 mm panel front · DIN rail |
| Power Supply | 100–415 V AC |
Integration with Argus EMS
The PM3250 connects to Argus EMS over Modbus RTU over an RS-485 serial line, 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 RTU over an RS-485 serial line |
| Connection path | The RS-485 line lands on a Modbus TCP gateway or on the field PC serial port |
| Default polling period | 60 seconds (field agent) |
| Points in the ready template | 38 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?
It suits metering mid-sized loads separately — floor panels, kitchens, laundries or a chiller. Energy, demand and power factor are tracked together, and the internal breakdown of consumption becomes meaningful from this level onwards.
The device has a serial output, so it joins the existing RS-485 line instead of requiring a dedicated Ethernet run into the panel. The more devices share one line, the longer a polling round takes, which is why the field agent reads each line sequentially and waits 60 ms between devices by default. A slave ID collision and a missing line termination are the two most common commissioning mistakes.