Lenze DDS Global Drive PLC Developer Studio - Manual (Page 19)

Function library LenzeCanDSxDrv.lib
Functions/function blocks
3.6 L_CanDSxHeartBeat − Execution of "Heartbeat"
3−7
L
LenzeCanDSxDrv.lib EN 1.2
3.6 L_CanDSxHeartBeat − Execution of "Heartbeat"
Function block
This FB is used for the cyclic monitoring of the CAN connection between the PLC and other system
bus devices by means of the "Heartbeat" mechanism.
·
The FB acts as "Heartbeat consumer". For this, it must be activated in the monitoring PLC.
·
Before the function is executed, the "Heartbeat" monitoring mechanism must be initialised in
the CanDSx driver by means of the function L_CanDSxOpenHeartBeat.
( ^ 3−6)
L_CanDSxHeartBeat
tHeartBeatConsumerTime
wDrvNr
byNodeAddr
bRun CTRL
nState
Heartbeat producer
(Node address = ) byNodeAddr
System bus
(CAN)
FB call in: o Cyclic task
(PLC_PRG)
þ Time−controlled task
(INTERVAL)
o Event−controlled task
(EVENT)
o Interrupt task
Inputs Data type Information/possible settings
wDrv Word Driver number for the CAN interface of the PLC
10 On board system bus (CAN)
byNodeAddr Byte Node address of the bus device to be monitored.
1 ... 128 Node address
bRun Bool Activation of "Heartbeat" monitoring.
TRUE Monitoring is activated.
·
The FB continuously monitors if the bus device with node address byNodeAddr
sends its "Heartbeat" message within the selected monitoring time
tHeartBeatConsumerTime via the system bus and outputs the corresponding
status at nState.
tHeartBeat
ConsumerTime Time Monitoring time within which the "Heartbeat" message is to be received from the bus device to be
monitored. Otherwise, a "Heartbeat" event ( nState = −10) will be activated.
·
Adapt the consumer time to the "Heartbeat producer time" in which the bus device to be
monitored sends the "Hearbeat" message.
·
Recommended setting: 200 ... 2000 ms
·
Maximum setting: 65535 ms