![background image](http://html1.mh-extra.com/html/omron/cj1w-cort21/cj1w-cort21_operation-manual_742494073.webp)
3-3
3 Data Exchange with the CPU Unit
CJ-series User Defined CAN Unit Operation Manual for NJ-series CPU Unit (W517)
3-1 Dat
a Exch
ang
e with t
h
e C
P
U
Unit
3
3-
1-1 D
ata
Flow
Item
Loca-
tion/Variable
Description
Control and
Status Flags
*_EnblCANC
omm
,
*
_StaComm
Flags to control the Unit behavior and to show the status of the Unit.
Send Triggers Configurable
Triggers to send CAN messages on demand. Bits in the send trigger area
will send a message if the bit-value has a rising edge and the bit is asso-
ciated with an output buffer. Command messages are used to define a
send trigger area, to associate an identifier with an output buffer and a
send trigger.
Receive Flags
Flags indicating which messages have been received. A received mes-
sage is identified by its identifier and in case a bit in the receive flags area
is associated with the received identifier, this bit is set. The message con-
tent is placed in the corresponding input buffer. Message commands are
used to define a receive flag area, to associate an identifier with an input
buffer and a receive flag.
CAN Output
Message Buf-
fers
The message content to send. Every output buffer can only have one
message.
CAN Input
Message Buf-
fers
The content of the received messages. Every input buffer can have only
one message at a time. New incoming messages will overwrite the previ-
ous content of the input buffer.
Summary of Contents for CJ1W-CORT21
Page 2: ......
Page 140: ...Appendices A 6 CJ series User Defined CAN Unit Operation Manual for NJ series CPU Unit W517...
Page 141: ...Index 1 CJ series User Defined CAN Unit Operation Manual for NJ series CPU Unit W517 I Index...
Page 144: ...Index 4 CJ series User Defined CAN Unit Operation Manual for NJ series CPU Unit W517 Index...