Delta DVP-ES2 - Manual (Page 669)

7 C AN o p e n F u n c t i o n a n d O p e r a t i o n
7 - 1 3
Initialization Pre-operational Operational Stopped
EMCY X X
Boot-up X
NMT X X X
The format of the control message for the node state:
COB-ID Byte 0 Byte 1
0 Command specifier (CS)
Slave address
(0: Broadcast)
The command specifiers are listed below.
Command specifier
(hex)
Function
01 Start the remote node
02 Stop the remote node
80 Enter the pre-operational state
81 Reset the application layer
82 Reset the communication
—
Error control services
The error control service is used to detect the disconnection of the node in the network. The
error control services can be classified into two types, i.e. Heartbeat and Node Guarding.
The PLC only supports Heartbeat. For example, the master can detect the disconnection of
the slave only after the slave enables the Heartbeat service.
The Heartbeat principle is illustrated as follows. The Hearbeat producer transmits the
Heartbeat message according to the Heartbeat producing time which is set. One or many
Heartbeat consumers detect the message transmitted by the Heartbeat producer. If the
consumer does not receive the message transmitted by the producer within the timeout
period, the CANopen communication is abnormal.
Reuqest
Receiving
Receiving
Request
Heartbeat consumer Heartbeat producer
Heartbeat
producing
time
Heartbeat
timeout
period
Heartbeat evnet
Heartbeat
timeout
period
Receiving