Lenze DDS System bus CAN for PLC - Manual (Page 163)

System bus (CAN) for Lenze PLC devices
LenzeCanDSxDrv.lib function library
11.6 L_CanDSxOpenHeartBeat − initialising a "Heartbeat"
11−7
L
PLC−Systembus EN 2.0
11.6 L_CanDSxOpenHeartBeat − initialising a "Heartbeat"
Function
In the CANopen communication profile (CiA DS301, version 4.01) two optional monitoring
mechanisms for ensuring the function of system bus nodes are specified, "Heartbeat" and "Node
Guarding".
By means of this function, the "Heartbeat" monitoring mechanism of the CanDSx driver is initialised.
·
For the initialisation the transfer parameter bOpen has to be set to TRUE.
·
The actual monitoring is carried out using the L_CanDSxHeartBeat FB. ( ^ 11−8)
·
By means of the function L_CanDSxCloseHeartBeat you can deactivate the "Heartbeat"
monitoring mechanism again.
( ^ 11−10)
Note!
Using both monitoring mechanisms at the same is not permitted!
If a non−zero transmission cycle time for the "Heartbeat" message is configured for the node to be
monitored, the "Heartbeat" mechanism is used prior to the "Node Guarding" mechanism.
Declaration
BOOL L_CanDSxOpenHeartBeat(bOpen);
Transfer parameters Data type Information/possible settings
bOpen Bool Initialising the "Heartbeat" monitoring mechanism.
TRUE The "Heartbeat" monitoring mechanism of the CanDSx driver is initialised.
Return value Data type Value/meaning
Bool Status
TRUE The "Heartbeat" monitoring mechanism has been initialised.
FALSE A The "Heartbeat" monitoring mechanism has not been initialised.
– Remedy: function call with transfer parameter bOpen = TRUE.
or
B Beforehand the function L_CanDSxOpenNodeGuarding has been called
("Node Guarding" is activated).
– Remedy: function call L_CanDSxCloseNodeGuarding with transfer
parameter bClose = TRUE (deactivate "Node Guarding").
Example
Calling the function in ST:
bReturnOpenHeartBeat := L_CanDSxOpenHeartBeat(bOpen:=TRUE);