Lenze DDS System bus CAN for PLC - Manual (Page 132)

System bus (CAN) for Lenze PLC devices
CAN−AUX system blocks
9.1 CANaux1_IO (node number: 34)
9−3
L
PLC−Systembus EN 2.0
9.1.3 Process data telegram
The process data telegram consists of an identifier and 8 bytes of user data.
11bit 8 bytes user data
Identifier Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6 Byte 7 Byte 8
Information on the identifier can be found in chapter 2.4.1. ( ^ 2−3)
9.1.4 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
CANaux1_bFDO0_b
...
CANaux1_bFDO7_b
CANaux1_nOutW0_a
2 0
...
7
CANaux1_bFDO8_b
...
CANaux1_bFDO15_b
3 0
...
7
CANaux1_bFDO16_b
...
CANaux1_bFDO23_b
CANaux1_nOutW1_a
4 0
...
7
CANaux1_bFDO24_b
...
CANaux1_bFDO31_b
5 0
...
7
CANaux1_bFDO32_b
...
CANaux1_bFDO39_b
CANaux1_nOutW2_a
CANaux1_dnOutD1_p
6 0
...
7
CANaux1_bFDO40_b
...
CANaux1_bFDO47_b
7 0
...
7
CANaux1_bFDO48_b
...
CANaux1_bFDO55_b
CANaux1_nOutW3_a
8 0
...
7
CANaux1_bFDO56_b
...
CANaux1_bFDO63_b
Note!
Avoid simultaneous overwriting via different variable types to ensure data consistency.
For instance, if you want to write bytes 5 and 6, only use the variable CANaux1_dnOutD1_p,
CANaux1_nOutW2_a, or only the variables CANaux1_bFDO32_b ... CANaux1_bFDO47_b for this
purpose!