Lenze DDS System bus CAN for PLC Manual de usuario descargar pdf (Pagina 155)

System bus (CAN) for Lenze PLC devices

LenzeCanDrv.lib function library

10.8 L_CanPdoReceive − receiving a CAN object

10−13

PLC−Systembus EN 2.0

Receive status (nState)

Data type Value Meaning Priority

Integer

−150 CAN bus is not in the Operational state. 1 (high)

−121 Incorrect driver number (wDrvNr) 2

−120 Driver not initialised 3

−12 The set message identifier (COB−ID) is beyond the permissible range (0 ... 2047). 4

−11 Pointer pIOAdress does not point to PLC−RAM. 5 (low)

* If there are several error causes, always the value associated with the error cause

of the highest priority is returned.

0 Data have been faultlessly received.

10 The specification for the telegram length byLen is higher than 8. The telegram length has been

limited to 8 bytes.

200 Data were received without resetting bNewMessage. Therefore valid data were possibly overwritten

in the receive memory.

Resetting the variable "bNewMessage"

If data have been received from the CAN bus, the output variable bNewMessage is set to TRUE and

only is reset to FALSE again by calling the action <Instance name>.ResetNewMessage:

(* FB instance *)

ReceiveFromID678: L_CanPdoReceive; (* receive data *)

(* from identifier 678 *)

...

(* reset NewMessage information at FB ReceiveFromID678 *)

ReceiveFromID678.ResetNewMessage; (* reset NewMessage *)

Example

Calling the function block in ST:

ReceiveFromID678(wDrvNr:=10,

byLen:=8,

dwCobID:=678,

pIOAdress:=ADR(abyReceiveData);

Note!

The use of an address which is stored in the memory area of the operating system is not permitted

for the L_CanPdoTransmit and L_CanPdoReceiveFBs!

· See also note to the function L_CanPdoTransmit. (^ 10−8)

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Lenze DDS System bus CAN for PLC Manual de usuario Pagina 155