LK3U PLC

Compatible with FX3U PLC integrated IO, analog, temperature pulse, weighing, can functions in one

LK3U PLC

ModelDIDOAIAOPulse inputPulse outputCommunication
port
LK3U-14MR-4AD-2DA86422/1 channel RS232,
2 channel RS485;
Option 1 can module
LK3U-14MT-4AD-2DA8642241 channel RS232,
2 channel RS485;
Option 1 can module
LK3U-20MR-4AD-2DA128422/1 channel RS232,
2 channel RS485;
Option 1 can module
LK3U-20MT-4AD-2DA12842241 channel RS232,
2 channel RS485;
Option 1 can module
LK3U-32MR-10AD-2DA16161022/1 channel RS232,
2 channel RS485;
Option 1 can module
LK3U-32MT-10AD-2DA1616102281 channel RS232,
2 channel RS485;
Option 1 can module
LK3U-48MR-10AD-2DA24241022/1 channel RS232,
2 channel RS485;
Option 1 can module
LK3U-48MT-10AD-2DA2424102281 channel RS232,
2 channel RS485;
Option 1 can module
LE3U-64MR-10AD-2DA32321022/1 channel RS232,
2 channel RS485;
Option 1 can module
LE3U-64MT-10AD-2DA3232102281 channel RS232,
2 channel RS485;
Option 1 can module

IO Expansion module

LK8EX8EYRDimensions 118*88*45
Installation hole distance 95*37
8 input 8 relay outputinput X00-X117
output Y100-Y117
Max 2
LK8EX8EYTDimensions 118*88*45
Installation hole distance 95*37
8 input 8 transistor outputinput X00-X117
output Y100-Y117
Max 2
LK-16EXDimensions 118*88*45
Installation hole distance 95*37
16 inputX120-X157Max 2
LK-16EYRDimensions 118*88*45
Installation hole distance 95*37
16 relay outputsY120-Y157Max 2
LK-16EYTDimensions 118*88*45
Installation hole distance 95*37
16 transistor outputsY120-Y157Max 2

Analog/Weighing/Temperature Expansion Module

E4DADimensions 118*88*45
Installation hole distance 95*37
4 analog outputs, compatible 0-10V/0-20maD1000-D1015Max 2
E8ADDimensions 118*88*45
Installation hole distance 95*37
8 analog inputs, compatible 0-10V/0-20maD1016-D1023Max 2
E2WHDimensions 118*88*45
Installation hole distance 95*37
2-channel weighing,S+ S- E+ E-D1048-D1055 each channel occupies 2 registers (fault address M1048-M1051)Max 1
E4WHDimensions 118*88*45
Installation hole distance 95*37
4 channel weighing,S+ S- E+ E-D1048-D1055 each channel occupies 2 registers (fault address M1048-M1051)Max 1
E2TCDimensions 118*88*45
Installation hole distance 95*37
2-channel thermocouple, type KD1036-D1047 (fault address M1036-M1047)Max 2
E4TCDimensions 118*88*45
Installation hole distance 95*37
4-channel thermocouple, type KD1036-D1047 (fault address M1036-M1047)Max 2
E6TCDimensions 118*88*45
Installation hole distance 95*37
6-channel thermocouple, type KD1036-D1047 (fault address M1036-M1047)Max 2
E2PTDimensions 118*88*45
Installation hole distance 95*37
2-channel PT100D1024-D1035 (fault address M1024-M1035)Max 2
E4PTDimensions 118*88*45
Installation hole distance 95*37
4-channel PT100D1024-D1035 (fault address M1024-M1035)Max 2
E6PTDimensions 118*88*45
Installation hole distance 95*37
6-channel PT100D1024-D1035 (fault address M1024-M1035)Max 2

Custom function

Thermal resistance temperature NTC
NTC 10K (-40~150 degrees) NTC 50K (-40~209 degrees)

Weighing function
Up to 2 weighing interfaces: E+ E- S+ S-, excitation voltage 5V, signal voltage -20mV~+20mV, data collection frequency 10Hz

CAN communication
Mode 1, connection of multiple industrial control boards, extended IO or analog temperature, etc., response speed without any delay, maximum 320 channels, extended analog temperature input, without occupying 485 and 232 communication ports.
Mode 2: Connect dedicated IO extension and analog module

AD analog input description

Analog quantity range setting

AD range setting: D0 is the upper limit of the range, D1 is the lower limit of the range (occupying 2 registers) D0 is not a fixed register, other registers can be used

Range setting formula:

Input signal 0-10V (0-20mA): D0=External upper range, D1=External lower range
Input signal 4-20mA: D0 = external upper range, D1 = external lower range-((external upper range-external lower range)/4)

Examples of range setting:

Pressure transmitter external range 0-5Kpa
Input signal 0-10V (0-20mA): D0=5000, D1=0
Input signal 4-20mA: D0=5000, D1=0-((5000-0)/4)=-1250

NTC temperature reading instructions

Need to buy (NTC-10K thermistor with B value 3950, NTC-50K thermistor with B value 3950)

Note: When the probe wire is too short, please do not connect other electronic wires. Only wires with low impedance and strong anti-interference ability can be used, otherwise the temperature will be unstable.

NTC temperature reading without setting range

Divide the read data by 10, which is the actual temperature
When D10=500, it means that the current temperature of the first channel is 50 degrees
When D10=437, it means that the current temperature of the first channel is 43.7 degrees
When D11=800, it means that the current temperature of the second channel is 80 degrees
When D11=-200, it means that the current temperature of the second channel is -20 degrees

ntc10k is converted to ntc50k

Add M8000-M0V K4095 D8009 to the program

DA analog output description

Analog output command: WR3A

Range setting: the same as the analog input setting method, when the range is not set, 0-10V corresponds to 0-4095
Example: When D0 upper limit range is set to 1000 (the lower limit can be set to 0 by default)

  1. When D10=500, DA0 outputs 5V voltage
  2. When D10=800, DA0 outputs 8V voltage
  3. When D11=340, DA1 outputs 3.4V voltage
  4. When D11=550, DA1 outputs 5.5V voltage

Weighing function HX711

HX711 function description
M8112: Start HX711 function (ON to execute collection)
M8114:: HX711 read error, the error is turned ON, manual reset is required
D8114: Filtering times (0-32, default 12, 0-2 does not perform filtering)
D8112: HX711 data low bit
D8113: HX711 data high bit

Note: The relay or register used above D8112 D8113 D8114 keeps data after power failure

Note: Since M8112 will not reset the PLC after it is stopped, if M8112 is turned ON, the data of HX711 will be read to D8112 D8113 regardless of whether the PLC is stopped or running.

D8116: The first channel weighing filter timesD8117: The second channel weighing filter times
D8118: The third channel weighing filter timesD8119: The fourth channel weighing filter times
D8120: Low bit of the first channel weighing dataD8121: High bit of the first channel weighing data
D8122: Low bit of the second channel weighing dataD8123: High bit of the second channel weighing data
D8124: Low bit of the third channel weighing dataD8125: The high bit of the third channel weighing data
D8126: Low bit of the fourth channel weighing dataD8127: High bit of the fourth channel weighing data
M8120: Start the weighing function of the first channelM8121: Weighing error in the first channel cannot be automatically reset
M8122: Start the weighing function of the second channelM8123: Weighing error in the second channel cannot be automatically reset
M8124: Start the third channel weighing functionM8125: The third channel weighing error, can not automatically reset
M8126: Start the fourth channel weighing functionM8127: The fourth channel weighing error, can not automatically reset

LK3U PLC Manual

Example

lk3u-485-port1-RS
lk3u-modbusrtu-example

The expansion module must activate the can function

LK3U-MODBUSRTU-RS case

RS485-1/RS485-2 communication port parameter setting

RS485-1 protocol selectionBaud rateStop bitParity checkData lengthD8400/D8420valueD8401/D8421value
Modbus-RTU slave protocol96001 bitodd parity8 bitK12419DecimalK1Decimal
H3083HexadecimalH1Hexadecimal
RS485-2 protocol selectionBaud rateStop bitParity checkData lengthD8400/D8420valueD8401/D8421value
RS2 free communication protocol96001 bitNo verification8 bitK4225DecimalK0Decimal
H1081HexadecimalH0Hexadecimal
0(bit=OFF) 1(bit=ON)
bit0Data length7 bit*1 8bit
bit1
bit2
Paritybit2 bit1
(0 0)No verification
(0 1) ODD
(1 1) EVEN
bit3Stop bit1bit 2bit
bit4
bit5
bit6
bit7
ratebit7 bit6 bit5 bit4 bit7 bit6 bit5 bit4
(0 0 1 1):300 (1 0 0 0):9600
(0 1 0 0):600 (1 0 0 1):19200
(0 1 0 1):1200 (1 0 1 0):38400
(0 1 1 0):2400 (1 0 1 1):57600
(0 1 1 1):4800 (1 1 0 1):115200
bit8~bit11Disableset 0
bit12
bit13
bit14
bit14 bit13 bit12
(0 0 0): Programming port protocol
(0 0 1): RS no protocol communication (RS485-1 dedicated)
(0 1 0): RS2 non-protocol communication (RS485-2 dedicated)
(0 1 1): MODBUS-RTU protocol (D8401//D8421 set master and slave station)
bit15Disableset 0
  1. When the data bit is 7 bits, no parity cannot be selected, otherwise, a 6304 fault code will be reported.
  2. When the programming port protocol is selected, the data length is 7 bits, the stop bit is 1 bit, and the parity and even parity are fixed parameters that cannot be set, and the baud rate can be set.
  3. Select MODBUS-RTU protocol, RS free port protocol, RS2 free port protocol, data length, stop bit, parity, baud rate, all can be set.
  4. If D8400 or D8420 does not open the MODBUS-RTU master station function, when the ADPRW instruction is used, the 6706 fault code will be reported.
  5. When the value of D8401/D8421 is HO, the MODBUS master station protocol is selected.
  6. When the value of D8401/D8421 is H10, the MODBUS slave station protocol is selected.

9 thoughts on “LK3U PLC”

  1. Hello,

    What are the retentive area’s of memory? Is retentive memory eeProm or battery backup?
    Can you have 2 types of AI 4 x NTC 10K & 4 x 0-20mA?
    Can you use GX Works 2 to program?

    Reply
  2. Muy buenas estimad@s en la linea LK3U veo que tiene para celula de pesaje pero mi duda es: que tan exacta es, cual es la velocidad de refresqueo(HZ) y si tiene algun video o ejemplo real para mas informacion. gracias saludos

    Reply

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