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5-10
User Manual CM-CAN1
5 Control and reference input
5.5 Identifiers
5.5.1 Selective
transmissions
For communication between the various CAN bus stations a “base” CAN
identifier is defined for each data transfer.
Each station on the bus is assigned an address (0 - 99) which can be set
on the devices by way of two different options:
1. By way of parameter 571-CLADR
2. By way of the coding pins on CAN connectors X11 and X12
Setting by way of parameter has priority. Only if the address set in the
parameter is 0 is the hardware preset applied (see also section 2.1 “Set-
ting the address”).
Station 0 operates with the “base” CAN identifier. All other stations
operate with identifiers calculated according to the following formula:
* - DLC = Data Length Code (number of data bytes)
ID = “base” CAN identifier + number of station
Base identifier ID DLC* Function
441 (1B9
hex
)
3 Error messages from device
1543 (607
hex
)
0 Logon identifier
661 (295
hex
)
*6 Control identifier
881 (371
hex
)
*6 Status identifier
1101 (44D
hex
)
8 Parameter channel, data direction Master -> Slave
1321 (529
hex
)
8 Parameter channel, data direction Slave -> Master
* CACNF dependent See section 5.5.5
Table 5.5 Base identifier
Broadcast identifier DLC* Function
221 (DD
hex
)
1
Switch system state START/STOP, no base ID,
broadcast
Table 5.6 Broadcast identifier