Communication Specifications; Self-Diagnostic Function; Power Failure Memory; Applicable Standard - Panasonic KW8M User Manual

8.4 Communication Specifications

Interface
Protocol
Isolation status
Number of connected units
Transmission distance
Transmission speed
Data length
Transmission
Parity
Format
Stop bit
Communication method
Synchronous system
Ending resistance
*1 Please check with the actual devices when some commercial devices with RS485 interface are
connected. The number of connected devices, transmission distance, and transmission speed may
be different according to using transmission line.
*2 For RS485 converter on the computer side, we recommend SI-35 and SI-35USB (from LINE EYE
Co.,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 function

If an error occurs, the following indication will be given.
Indicator
ERR0 CPU error
ERR1 Memory error*
*Includes the possibility that the EEP-ROM's life has expired.

8.6 Power Failure Memory

Eco-POWER METER memories integral electric power and working status to internal EEP-ROM until
when power supply is off. (Power failure guarantee)
And every time to change each setting, each setting value is memorized to internal EEP-ROM at the
same time. Therefore, change setting frequently makes EEP-ROM's life short. Avoid to usage like
this.
*Especially be careful if you set by communication.

8.7 Applicable standard

Safety standard EN61010-1
EMI
EN61326-1
EMC
EMS
EN61326-1
Conforming to RS485
MEWTOCOL/MODBUS(RTU) (selectable with setting mode)
Isolated with the internal circuit
2
99 (max.) ＊
1200m (max.)
38400/19200/9600/4800/2400bps (selectable with setting mode)
8bit/7bit (selectable with setting mode)
Not available / Odd number / Even number (selectable with setting mode)
1bit（fixed）
Half-duplex
Synchronous communication method
approx. 120Ω(built-in)
Meaning Output status
OFF
Radiation interference field strength
Noise terminal voltage
Static discharge immunity
RF electromagnetic field immunity
EFT/B immunity
Surge immunity
Conductivity noise immunity
Power frequency magnetic field immunity
Voltage dip / Instantaneous stop /
Voltage fluctuation immunity
KW8M Eco-POWER METER (1A/5ACT input type)
3
＊
1
＊
Turn the power off and then on again.
EEP-ROM life ended. Replace the unit.
48
4
＊
To recover
CISPR11 class A
CISPR11 class A
EN61000-4-2
EN61000-4-3
EN61000-4-4
EN61000-4-5
EN61000-4-6
EN61000-4-8
EN61000-4-11