Lenze 9300 Servo PLC, Руководство пользователя

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System bus (CAN) with Servo PLC & Drive PLC
LenzeCanDrv.lib - Function blocks
9.2 Receive CAN object (L_CanPdoReceive)
9-5
L
PLC-Systembus EN 1.1
9.2 Receive CAN object (L_CanPdoReceive)
This FB is used to receive data via the system bus interface according to CANopen.
Tip!
Due to a high bus load or extremely high transmission rates of other bus participants, data receipt
might be overloaded if additional receive telegrams arrive while a receive telegram is being
processed
In this case, the operating system sends an overrun error:
•
An appropriate error message is displayed (see chapter “ Error messages” in the relevant PLC
Manual, e.g. 9300 Servo PLC or Drive PLC).
•
In addition, the CAN driver for the free CAN objects is deactivated and must be re-initialised
by means of the L_CanInit function.
L_CanPdoReceive
wDrvNr
byLen
dwCobId
pIOAdress
nState
bNewMessage
Fig. 9-2 Receive CAN object (L_CanPdoReceive)
Identifier Data type Type of variable Possible settings Info
wDrvNr Word VAR_INPUT 10
11 System bus
FIF CAN
byLen Byte VAR_INPUT 0 ... 8 Telegram length (in bytes)
dwCobID Double word VAR_INPUT 0 ... 2047 CAN identifier
pIOAdress Pointer to byte VAR_INPUT Pointer positioned over the
memory address from which
on the received data bytes will
be saved.
Use the
ADR
address function to ascertain the
address of a variable.
bNewMessage Bool VAR_OUTPUT - Set to
TRUE
if data was received and only reset
to
FALSE
if the below command is called:
<Instanzname> ResetNewMessage
•
Unless the variable is reset, data can continue
to be received, data receipt is, however, not
displayed.
nState Integer VAR_OUTPUT - Shows the latest receive state.
•
See below table
“Receive state (nState)”
Note!
When selecting the CAN identifier (dwCobId), please make sure that the identifier is not yet used
by another CAN object CAN1_IO ... CAN3_IO since this would lead to the receipt of wrong data.
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