Panasonic AKW1110, User Manual

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KW1M Eco
－
POWER METER
44
8.3 Output Specifications
8.3.1 Pulse output (Transistor output)
AKW1111 AKW1110
Number of output point 1 point
Insulation method Optical coupler
Output type Open collector
Output capacity 100mA 30V DC
Pulse width approx. 100ms
ON state voltage drop 1.5V or less
OFF state leakage current 100 μ A or less
Pulse output unit
0.001/0.01/0.1/1/10/100kWh/
Alarm(AL-P)/ Current alarm(
AL-C)/
Stand-by alarm (AL-S) /
Counter output (Cnt)
(Selectable with setting mode)
0.001/0.01/0.1/1/10/100kWh/
Alarm(AL-P)/ Current alarm(
AL-C)
(Selectable with setting mode)
* We recommend the setting of minimum unit for pulse output for measurement shown as below.
Output pulse: 4 pulse or less per 1sec.
How to calculate
(Unit for pulse output: PL-P)
＞
(Max. measurement power [kW]
）／
(3600[s]
×
4 [pulse/s])
Note (1) Improper unit setting may cause miss counting.
(2) If the OFF time is too short, there is a possibility of counting errors.
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.