Application The A 210/A 220 power measuring instrument is suitable for control panel mounting and measures all the important measurands in 3-phase and single-phase systems. It displays the measurands with a high contrast 14 mm high LED display. The instrument is also suitable for measurements in high and middle voltage systems because of the freely programmable factors for the current and voltage transformers. It replaces a large number of analog instruments and delivers high-accuracy values. The basic exectuion is an instrument with 2 S0-outputs, which can be programmed as pulse or limit outputs. Extension modules increase the functionality and fl exibility. The EMMOD 201 module has an RS232/RS485 interface and supports data exchange with a control system via MODBUS RTU. Memory and a digital input (switching between high and low tariffs) for monitoring, or the storage of average power values (load profi le) complete the functionality. The user-friendly A200plus software supports parameter setting and reading the measured values. The EMMOD202 has 2 galvanically isolated analog outputs. Any of the important input measurements can be assigned to the 4 - 20 or 0 - 20 mA signal, and it is possible to program an inverted characteristic. EMMOD203 users can communicate with the Ethernet and Internet worlds with the MODBUS protocol over TCP/IP and HTTP. In addition, the module has an extensive memory, which supports backed up recordings for up to one year. The data are recorded with an exact time stamp, which is given by an internal, battery backed up clock. Further modules are the EMMOD204 (Profi bus-DP), the EMMOD205 (LON) and the EMMOD206 (M-Bus). All the modules can be upgraded by simply plugging in the extension module without having to open the power monitoring instrument. A separate power supply is not required.