Lenze DDS Global Drive PLC Developer Studio Bedienungsanleitung PDF herunterladen (Seite 23)

Function library LenzeCanDSxDrv.lib

Functions/function blocks

3.9 L_CanDSxNodeGuarding − Execution of "Node Guarding"

3−11

LenzeCanDSxDrv.lib EN 1.2

3.9 L_CanDSxNodeGuarding − Execution of "Node Guarding"

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 "Node Guarding" mechanism.

· Before the function is executed, the "Node Guarding" monitoring mechanism must be

initialised in the CanDSx driver by means of the function L_CanDSxOpenNodeGuarding.

(^ 3−10)

L_CanDSxNodeGuarding

tNodeGuardTime

wDrvNr

byNodeAddr

bRun

CTRL

nState

NMT Slave

(Node address = )byNodeAddr

System bus

(CAN)



byNodeLifeTimeFactor



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 Drive 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 "Node Guarding".

TRUE Monitoring is activated.

· The FB uses the transmission cycle selected under tNodeGuardTime, sends a

remote transmission request telegram to the bus device with the node address

byNodeAddr and expects a corresponding response. If the response is not

received within the monitoring time ("NodeLifeTime"), the FB will output the

corresponding status at nState.

tNodeGuardTime Time Transmission cycle of the remote transmission request telegram.

· Time interval in which the PLC sends a status enquiry to the bus device to be monitored (cyclic

polling).

· The setting must correspond to the "GuardTime" (C0382) selected in the PLC to be monitored.

byNodeLifeTimeFactor Byte Factor for the "NodeLifeTime".

"NodeLifeTime" = byNodeLifeTimeFactor  tNodeGuardTime

· Unless the bus device to be monitored responds to the status enquiry within the

"NodeLifeTime", a "Node Guarding" event will be activated (nState = −10).

· The setting must correspond to the "NodeLifeTimeFactor" (C0383) selected in the PLC to be

monitored.

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