KW8M Eco-POWER METER (1A/5ACT input type)
48
8.4 Communication Specifications
Interface
Conforming to RS485
Protocol
MEWTOCOL/MODBUS(RTU) (selectable with setting mode)
Isolation status
Isolated with the internal circuit
Number of connected units
99 (max.)
*
2
*
3
Transmission distance
1200m (max.)
*
1
Transmission speed
38400/19200/9600/4800/2400bps (selectable with setting mode)
Data length 8bit/7bit (selectable with setting mode)
*
4
Parity
Not available / Odd number / Even number (selectable with setting mode)
Transmission
Format
Stop bit
1bit
(
fixed
)
Communication method
Half-duplex
Synchronous system
Synchronous communication method
Ending resistance
approx. 120
Ω
(built-in)
*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
Meaning
Output status
To recover
ERR0
CPU error
Turn the power off and then on again.
ERR1 Memory
error*
OFF
EEP-ROM life ended. Replace the unit.
*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
Radiation interference field strength
Noise terminal voltage
CISPR11 class A
CISPR11 class A
Static discharge immunity
EN61000-4-2
RF electromagnetic field immunity
EN61000-4-3
EFT/B immunity
EN61000-4-4
Surge immunity
EN61000-4-5
Conductivity noise immunity
EN61000-4-6
Power frequency magnetic field immunity
EN61000-4-8
EMC
EMS
EN61326-1
Voltage dip / Instantaneous stop /
Voltage fluctuation immunity
EN61000-4-11