LK3U PLC CAN function

CAN function description

The CAN communication port used by our PLC is only used for internal networking between our PLCs (cannot communicate with external CAN port). The networking mode is shared register. All PLCs in the same network can read any PLC shared registers in the network. Values can only be written to registers that are shared by themselves.

1) The CAN function can be set to 1 master, up to 32 slaves (setting range: 1~32), and the maximum number of registers shared by each station is 32 (setting range: 1~32);

2) CAN function communication baud rate can be set: 20K, 50K, 80K, 100K, 125K, 200K, 250K, 400K, 500K, 600K, 1000K (if the unsupported baud rate is set, the automatic default is 250K) ;

3) The shared register of the master and all slaves is shared with each other. Each station can share up to 32 registers. For details, see: Master and slave shared address table;

4) Repeated fault detection with slave/host address, and corresponding fault fault detection, see the fault description for details;

5) Using CAN networking is fast, simple and convenient, just set a few registers.

Special Relays and Register Description

Master

M8150-CAN allows work

M8149-Communication timeout flag (CAN does not communicate or timeout flag. After this flag is ON, it needs to be manually turned OFF in the program)

D8149-Communication timeout parameter (1=1ms, default 50ms)

D8150-host settings (0=host)

D8151-number of slaves (1~32, default 8)

D8152-Number of shared registers (1~32, default 8)

D8153-communication baud rate (20K~1000K, default 250K)

D8196-Slave that can't communicate (1~16)

D8197-Slave that can't communicate（17~32）

D8198-Slave that can't communicate list（1~16）

D8199-Slave that can't communicate list（17~32）

D8200-Maximum time to communicate with the slave successfully (1 = 1ms)

Slave

M8150-CAN allows work

M8149-Communication timeout flag (CAN does not communicate or timeout flag. After this flag is ON, it needs to be manually turned OFF in the program)

D8149-Communication timeout parameter (1=1ms, default 60ms)

D8150-slave address setting (1~32)

D8152-Number of shared registers (1~32, default 8)

D8153-communication baud rate (20K~1000K, default 250K)

D8196-Slave that can't communicate（1~16）

D8197-Slave that can't communicate（17~32）

D8198-Slave that can't communicate list（1~16）

D8199-Slave that can't communicate list（17~32）

D8200-Maximum time for successful communication with the host (1=1ms)

Note：

1. D8196 D8197 communication is not on the slave flag is 500ms automatic reset once;

2, D8198 D8199 communication is not on the slave summary, after the power-on, the communication is not on the machine summary, reset after power off!

3, CAN related register parameters, after setting, you need to disconnect the power before executing according to the new data;

4. Master/slave communication timeout setting: The slave D8149 is recommended to be 10ms larger than the host (host 50ms, slave should be 60ms)

5, the master / slave D8152 (the number of shared registers) must be guaranteed to be the same;

b15

b14

b13

b12

b11

b10

D8196

16机

15机

14机

13机

12机

11机

10机

9机

8机

7机

6机

5机

4机

3机

2机

1机

D8197

32机

31机

30机

29机

28机

27机

26机

25机

24机

23机

22机

21机

20机

19机

18机

17机

Note：

1. When the corresponding bit of the above register is 1, it indicates that the address corresponding to the bit is not communicated or the communication error occurs.

2. D8198 D8199 is the slave record that has not been communicated after the main board is powered on, and reset after power off;

Master / slave mutually shared register list

D8150

Start

End

Description

D8150

Start

End

Description

D1000

D1031

Host shared register

D1544

D1575

Unit 17 shared register

D1032

D1063

Unit 1 shared register

D1576

D1607

Unit 18 shared register

D1064

D1095

Unit 2 shared register

D1608

D1639

Unit 19 shared register

D1096

D1127

Unit 3 shared register

D1640

D1671

Unit 20 shared register

D1128

D1159

Unit 4 shared register

D1672

D1703

Unit 21 shared register

D1160

D1191

Unit 5 shared register

D1704

D1735

Unit 22 shared register

D1192

D1123

Unit 6 shared register

D1736

D1767

Unit 23 shared register

D1224

D1255

Unit 7 shared register

D1768

D1799

Unit 24 shared register

D1256

D1287

Unit 8 shared register

D1800

D1831

Unit 25 shared register

D1288

D1319

Unit 9 shared register

D1832

D1863

Unit 26 shared register

D1320

D1351

Unit 10 shared register

D1864

D1895

Unit 27 shared register

D1352

D1383

Unit 11 shared register

D1896

D1927

Unit 28 shared register

D1384

D1415

Unit 12 shared register

D1928

D1959

Unit 29 shared register

D1416

D1447

Unit 13 shared register

D1960

D1991

Unit 30 shared register

D1448

D1479

Unit 14 shared register

D1992

D2023

Unit 31 shared register

D1480

D1511

Unit 15 shared register

D2024

D2055

Unit 32 shared register

D1512

D1543

Unit 16 shared register

Note:
The start address of the register corresponding to the above machine number is fixed, and the end address is determined by D8152 (such as D8152=2, then there are only 2 shared registers of the master and slave, the main station D1000-D1001, the first machine D1032-D1033);

LK3U PLC General parameters

LK3U PLC-Communication port pin definition

LK3U PLC Component range

LK3U PLC Supported instructions

LK3U PLC Special relay M function description

LK3U PLC Special register D function description

LK3U PLC High-speed counter instructions

LK3U PLC Communication port

LK3U PLC High speed output

LK3U PLC Analog read and write instructions

LK3U PLC CAN function

LK3U PLC PID function