Cm598CanMsgRec (FB)

FUNCTION_BLOCK PUBLIC FINAL Cm598CanMsgRec EXTENDS Cm598Base

Function Block which is used to read CAN messages of the specified CAN Identifier that where received by the specified CAN interface. In order to receive any CAN message, the CAN protocol and a receive buffer for the desired CAN ID have to be configured in the PLC Application. The function block behavior is implemented according to the ETrig Function Block.

InOut:

Scope

Name

Type

Initial

Comment

Inherited from

Input

Execute

BOOL

FALSE

A rising edge starts the operation, the output Busy goes to TRUE. In the first cycle all other inputs are read and stored, afterwards they are ignored. A falling edge does not stop the operation. After Done = TRUE or Error = TRUE and Execute = FALSE all outputs will be reset.

AbbETrig

Output

Done

BOOL

FALSE

Operation is completed without error (while outputs Busy and Error are FALSE). This output is TRUE for at least one cycle or until Execute is set to FALSE

AbbETrig

Busy

BOOL

FALSE

Operation is running (while outputs Done and Error are FALSE)

AbbETrig

Error

BOOL

FALSE

Operation is stopped with error (while outputs Busy and Done are FALSE). This output is TRUE for at least one cycle or until Execute is set to FALSE. The output ErrorID gives more details about the error.

AbbETrig

Input

Device

IDeviceCM598Can

0

Instance of CM598Can device

Cm598Base

Output

ErrorID

ERROR_ID

ERROR_ID.NO_ERROR

Error code that describes the occured error

Cm598Base

Input

CanId

UDINT

0

CAN Identifier, “base frame format” (11bit, CAN 2.0A) or “extended frame format” (29bit, CAN 2.0B) can be used

IdExt

BOOL

FALSE

if FALSE CanId is in “base frame format”, if TRUE CanId is in “extended frame format”

Data

POINTER TO Cm598CanMessageType

0

Pointer to variable where the read CAN message is copied to

Output

Num

UINT

0

Number of CAN messages currently stored in the receive buffer

NumRec

UDINT

0

Total number of received CAN messages with the specified identifier

NumRej

UDINT

0

Total number of rejected CAN messages with the specified identifier

NumOwr

UDINT

0

Total number of overwritten CAN messages with the specified identifier