10 CHANGING DATA COMMUNICATION MONITORING TIME
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10 CHANGING DATA COMMUNICATION
MONITORING TIME
The monitoring time is time used by C24 to monitor the receiving interval time between each byte when receiving data from
the target device, the programmable controller CPU processing time, and the time it takes to transmit to the target device.
The monitoring time can be set for each interface. C24 uses the monitoring time set by the user to control data transmission to
and reception from the target device.
Set the monitoring time in accordance with the specifications of the target device.
C24 monitoring times are listed below.
: Configurable : Non-configurable, : Not used
*1 Nonprocedural and no-reception monitoring time method
The C24 input signal which turns ON when the no-reception monitoring time (timer 0) timed out differs.
Data communication using MC protocol
Monitoring time C24 default value Protocol that can monitor
the time
Remarks
MC Non Bi Pd
No-reception monitoring time
(timer 0)
Method
0
*1
0 bytes
(Unlimited wait)
Transmission time for the set number
of byte (depending on the
transmission speed)
Method
1
*1
Response monitoring time (timer 1) 5 seconds Transmission only for the bidirectional
protocol.
Send monitoring time (timer 2) 3 minutes
Transmission wait time 0 ms No wait time
Nonprocedural and no-reception monitoring time method Input signal which turns ON
Method 0 Reception abnormal detection (X4, XB)
Method 1 Reception data read request (X3, XA)
Command message
1 byte
Head data Last data
Head data Last data
Target device
CPU module
C24 ready to
receive data
state
Response message
Timer 0 monitoring time
Timer 0 elapsed time reset
Timer 2 monitoring time
H/W gate OFF time
Timer 1 monitoring time
Message wait time
Timer 2 elapsed time reset
Timer 1 elapsed time reset
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