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5 Communications Timing
5-6
CJ-series User Defined CAN Unit Operation Manual for NJ-series CPU Unit (W517)
Message Delay Time
The message delay time is described in section
.
Unit Processing Time for Transmitted / Received Messages
The unit processing time for received messages depends on the message rate of all the units con-
nected to the user Defined CAN Unit (the rate of received messages by the unit).
If the message rate is higher than the unit is capable of processing (see
), the
messages will queue, causing a delay in processing. If messages are received when the queue is
full, queue overflow occurs (see section 6,
Troubleshooting and Maintenance
Minimum I/O Response Time
CPU
CORT21
Bus
Input node
Output node
t
IN
t
MD
t
UPR
t
RF
t
PE
t
RF
t
UPT
t
MD
t
OUT
minimum I/O response time
t
IN
: Input Node ON (OFF)
delay
t
UPR
: Unit Processing time for Received messages
t
OUT
: Output Node ON (OFF) delay
t
UPT
: Unit Processing time for Transmitted messages
t
MD
: Message Delay time
t
PE
: Program Execution time
t
RF
: I/O Refresh time
Summary of Contents for CJ1W-CORT21
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