System bus (CAN) with Servo PLC & Drive PLC
System blocks
7.2
FIF_CAN2_IO
7-6
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.
User data
The first 4 of the 8 bytes of user data received are assigned to several variables of a different data
type at the same time and can therefore - as required - be evaluated as
•
binary information (1-bit)
•
quasi-analog value (16-bit)
•
phase-angle information (32-bit)
in the PLC program:
Byte
Variable (1-bit)
Variable (16-bit)
Variable (32-bit)
1, 2
FIF_CAN2_bInB
0
_b
...
FIF_CAN2_bInB
15
_b
FIF_CAN2_nInW1_a
FIF CAN2 dnInD1 p
3, 4
FIF_CAN2_bInB
16
_b
...
FIF_CAN2_bInB
31
_b
FIF_CAN2_nInW2_a
FIF_CAN2_dnInD1_p
5, 6
FIF_CAN2_nInW3_a
7, 8
FIF_CAN2_nInW4_a
Tip!
Via code C2457/2 you can set the monitoring time for data receipt. (Default setting: 3000 ms)
•
Additional information can be found in chapter 5.10.1.
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