Instruction Manual

System bus (CAN) for Lenze PLC devices
CAN system blocks
7.5 CAN3_IO (node number: 33)
7−19
L
PLC−Systembus EN 2.0
7.5.4 Assignment of the user data to variables
Several variables of different data types are assigned to the user data to be transmitted and received.
Thus, the data in the PLC program can be optionally interpreted as:
· binary information (1 bit)
· status word/quasi−analog value (16 bit)
· angle information (32 bit)
Variables for user data to be transmitted
User data Assigned variables
Byte Bit Variable (1 bit) Variable (16 bit) Variable (32 bit)
1 0
...
7
CAN3_bFDO0_b
...
CAN3_bFDO7_b
CAN3_nOutW1_a
CAN3_dnOutD1_p
2 0
...
7
CAN3_bFDO8_b
...
CAN3_bFDO15_b
3 0
...
7
CAN3_bFDO16_b
...
CAN3_bFDO23_b
CAN3_nOutW2_a
4 0
...
7
CAN3_bFDO24_b
...
CAN3_bFDO31_b
5 0...7
CAN3_nOutW3_a
6 0...7
7 0...7
CAN3_nOutW4_a
8 0...7
Note!
Avoid simultaneous overwriting via different variable types to ensure data consistency.
For instance, if you want to write bytes 1 and 2, only use the variable CAN3_dnOutD1_p,
CAN3_nOutW1_a, or only the variables CAN3_bFDO0_b ... CAN3_bFDO15_b for this purpose!
Variables for received user data
User data Assigned variables
Byte Bit Variable (1 bit) Variable (16 bit) Variable (32 bit)
1 0
...
7
CAN3_bInB0_b
...
CAN3_bInB7_b
CAN3_nInW1_a
CAN3_dnInD1_p
2 0
...
7
CAN3_bInB8_b
...
CAN3_bInB15_b
3 0
...
7
CAN3_bInB16_b
...
CAN3_bInB23_b
CAN3_nInW2_a
4 0
...
7
CAN3_bInB24_b
...
CAN3_bInB31_b
5 0...7
CAN3_nInW3_a
6 0...7
7 0...7
CAN3_nInW4_a
8 0...7