Access from the user program
KL3403
48
Version: 3.1.0
1
)
The energy consumption is counted in RAM and saved every 15 minutes in the EEPROM.
It is retained there even if the KL3403 is switched off. The command-register (
) can be used to clear the energy value or
to save it manually within 15 minutes.
2
)
The minimum and peak current value is deleted when the KL3403 is switched off.
It is recommended to clear the minimum and peak values from the user program once the terminal has started up, because it is
possible that incorrect values may have been stored during the startup, i.e. before the terminal measurements have stabilized.
3
)
The resolution of the energy consumption can be scaled for each channel with its register
4
)
The power factor (cos φ) can be displayed with or without sign (see bit
5
)
The flexible process image must be enabled (
= 1), in order to be able to read measured values from each channel
with input data word 1 (
)!
With the simple process image (
= 0), input data word 1 (DataIN1) can only read the first channel (in this case, bits
CB1.5, CB1.4 or SB1.5 and SB1.4 are not active).
6
)
The read values depend on the voltages and currents connected to the current transformer. They have to be converted by the ap-
plication.
Service life of the EEPROM
The energy consumption is stored in an EEPROM. The EEPROM manufacturer specifies a mini-
mum of 100000, typically 1 million possible write operations for this function block. The resulting
service life of the energy consumption memory at continuous operation, assuming that the energy
consumption is written to the EEPROM every 15 minutes, is:
• 2.85 years min.
• 28.5 years typical
Status byte 1 in process data mode
The status byte 1 (SB1) is located in the
, and is transmitted from the KL3403 to the
controller. Pay attention to the assignment of the control bytes to the process input data words in process
data mode.
Bit
SB1.7
SB1.6
SB1.5
SB1.4
SB1.3
SB1.2
SB1.1
SB1.0
Name
RegAccess
ERR L1
ChannelIdx
ProcDatIdx
Key
Bit
Name
Description
SB1.7
RegAccess
0
bin
Acknowledgment for process data mode
SB1.6
ERR L1
0
bin
Voltage between L1 and N greater than undervoltage threshold
(
1
bin
Voltage between L1 and N smaller than undervoltage threshold
(
1 LED is on.
SB1.5 to SB1.4 ChannelIdx
00
bin
measured value from channel 1.
01
bin
measured value from channel 2.
10
bin
measured value from channel 3.
11
bin
reserved
SB1.3 to SB1.0 ProcDatIdx
that was read with input data word 1
(
).
Register communication
Control byte 1 in register communication
Control byte 1 (CB1) is located in the
, and is transmitted from the controller to the
KL3403.
