Lenze Drive PLC - Page 67

System bus (CAN) with Servo PLC & Drive PLC
System blocks
6.2 CAN1_IO (Drive PLC)
6-9
L
PLC-Systembus EN 1.1
Process data telegram
The process data telegram consists of an
identifier and 8 bytes of user data.
11-bit 8-byte user data
Identifier Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6 Byte 7 Byte 8
Identifier
Information about the identifier can be found in chapter 2.3.1.
(^ 2-2)
User data
The 8 bytes of user data to be transmitted can be written by several variables of different data types
at the same time. This allows the PLC to transmit data - as required - as:
• binary information (1-bit)
• quasi-analog value (16-bit)
• phase-angle information (32-bit):
Byte Variable (1-bit) Variable (16 -bit) Variable (32 -bit)
1, 2 CAN1_bFDO 0 _b
...
CAN1_bFDO 15 _b
CAN1_nOutW0_a
3, 4 CAN1_bFDO 16 _b
...
CAN1_bFDO 31 _b
CAN1_nOutW1_a
5, 6 CAN1_bFDO 32 _b
...
CAN1_bFDO 47 _b
CAN1_nOutW2_a
C
A
N
1
d
n
O
u
t
D
1
p
7, 8 CAN1_bFDO 48 _b
...
CAN1_bFDO 63 _b
CAN1_nOutW3_a
C
A
N1_dnOu
t
D1
_
p
Tip!
Make sure that a byte to be transmitted is not at the same time written by different variable types to
ensure data consistency.
• For writing bytes 1 and 2, either use only the variable CAN1_dnOutD1_p , only the variable
CAN1_nOutW0_a or only the variables CAN1_bFDO0_b ... CAN1_bFDO15_b .
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