59
ifm
Programming Manual BasicDisplay CR0452 v03.02
05 / 2018
ifm function elements
ifm function elements for the device CR0452
CAN_RX
7586
Unit type = function block (FB)
Unit is contained in the library
ifm_RawCAN_NT_Vxxyyzz.LIB
Symbol in CODESYS:
>
Description
7588
CAN_RX is used for receiving a message.
The FB limits itself to a few functions and the required memory space is low.
CAN_RX filters for the set identifier. If several CAN messages with the same identifier are received in
one cycle, only the last / latest message is available.
>
Parameters of the inputs
7589
Parameter
Data type
Description
ENABLE
BOOL
TRUE:
execute this function element
FALSE:
unit is not executed
> Function block inputs are not active
> Function block outputs are not specified
CHANNEL
BYTE
CAN interface (1...n) depending on the device
ID
DWORD
Number of the data object identifier:
normal frame (2 048 IDs):
0...2 047 = 0x0000 0000...0x0000 07FF
extended Frame (536 868 864 IDs):
2 048...536 870 911 = 0x0000 0800...0x1FFF FFFF
>
Parameters of the outputs
7590
Parameter
Data type
Description
DATA
ARRAY [0..7] OF BYTE
received data, (1...8 bytes)
RESULT
BYTE
feedback of the function block
(possible messages → following table)
Possible results for RESULT:
Value
dec | hex
Description
0
00
FB is inactive
1
01
function block execution completed without error
5
05
FB is being processed
– still receiving
9
09
CAN is not active
242
F2
Error: setting is not possible