Panasonic KW8M User Manual

KW8M Eco-POWER METER (1A/5ACT input type)488.4 Communication SpecificationsInterface Conforming to RS485Protocol MEWTOCOL/MODBUS(RTU) (selectable with setting mode)Isolation status Isolated with the internal circuitNumber of connected units 99 (max.) ＊2 ＊3Transmission distance 1200m (max.) ＊1Transmission speed 38400/19200/9600/4800/2400bps (selectable with setting mode)Data length 8bit/7bit (selectable with setting mode) ＊4Parity Not available / Odd number / Even number (selectable with setting mode)TransmissionFormat Stop bit 1bit（fixed）Communication method Half-duplexSynchronous system Synchronous communication methodEnding resistance approx. 120Ω(built-in)*1 Please check with the actual devices when some commercial devices with RS485 interface areconnected. The number of connected devices, transmission distance, and transmission speed maybe different according to using transmission line.*2 For RS485 converter on the computer side, we recommend SI-35 and SI-35USB (from LINE EYECo.,Ltd.).*3 When using SI-35,SI-35USB or PLC from our company (which can be connected up to 99 units),up to 99 Eco-POWER METER can be connected. In case using this system with the other devices,up to 31 Eco-POWER METER can be connected.*4 With MODBUS(RTU) protocol, it works only with 8bit.8.5 Self-diagnostic functionIf an error occurs, the following indication will be given.Indicator Meaning Output status To recoverERR0 CPU error Turn the power off and then on again.ERR1 Memory error*OFFEEP-ROM life ended. Replace the unit.*Includes the possibility that the EEP-ROM’s life has expired.8.6 Power Failure MemoryEco-POWER METER memories integral electric power and working status to internal EEP-ROM untilwhen power supply is off. (Power failure guarantee)And every time to change each setting, each setting value is memorized to internal EEP-ROM at thesame time. Therefore, change setting frequently makes EEP-ROM’s life short. Avoid to usage likethis.*Especially be careful if you set by communication.8.7 Applicable standardSafety standard EN61010-1EMIEN61326-1Radiation interference field strengthNoise terminal voltageCISPR11 class ACISPR11 class AStatic discharge immunity EN61000-4-2RF electromagnetic field immunity EN61000-4-3EFT/B immunity EN61000-4-4Surge immunity EN61000-4-5Conductivity noise immunity EN61000-4-6Power frequency magnetic field immunity EN61000-4-8EMC EMSEN61326-1Voltage dip / Instantaneous stop /Voltage fluctuation immunityEN61000-4-11