System bus (CAN) with Servo PLC & Drive PLC
General information
2-5
l
PLC-Systembus EN 1.1
2.4
Network management (NMT)
Structure of the CAN telegram used for network management:
11 Bit
2-byte user data
Identifier
Command
Device address
Identifier
Command
Device address
00000000000
•
The master can use this telegram to make status changes for the entire CAN network.
Byte 1: Command
Command
(hex)
Network status
after status
change
Info
01
operational
The PLC can receive parameter and process data.
02
Stopped
The PLC can receive network management telegrams; parameter and process data cannot be received.
80
Pre-operational The PLC can receive parameter data; process data are ignored.
81
Reset node: Changes to system bus parameters relevant to communication (e g CAN address CAN baud
81
Initialisation
Reset node: Changes to system bus parameters relevant to communication (e.g. CAN address, CAN baud
rate etc ) are only accepted after a reset node
82
Initialisation
rate, etc.) are only accepted after a reset node.
82
,
)
y
p
Byte 2: Device address
Device address Info
0
All bus participants are addressed. In this way, a status change can be implemented for all devices at the same time.
1 ... 63
Node address of the participant the status of which is to be changed.
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