User`s manual

194
CHAPTER 6 CHANGING THE DATA
COMMUNICATIONS MONITORING
TIMES
The monitoring times are timers used by the Q series C24 to monitor the receiving interval time between each byte
when receiving data from the external device, the programmable controller CPU processing time, and the time it takes
to transmit to the external device.
The monitoring times can be set for each interface. The Q series C24 uses the monitoring time set by the user to
control data transmission to and reception from the external device.
Set the monitoring times to match the specifications of the external device.
The Q series C24 monitoring times are listed below.
Data communications using an MC protocol
Monitoring time Q series C24 default value
Protocol that can monitor the time
Remarks
MC
Non
procedure
Bidirectional
No-reception monitoring
time (timer 0)
Format 0
0 byte (Infinite wait)
 Transmission time for the set
number of bytes (depends on the
transmission rate)
Format 1  
Response monitoring time (timer 1) 5s  
For bidirectional protocol, this is
valid for transmission only.
Transmission monitoring time (timer 2) 3min   
Message wait time 0ms  No wait time
Timer 0 monitoring time
Timer 1 monitoring time
Message wait time
Timer 2 monitoring time H/W gate OFF time
External
device
Programmable
controller CPU
Timer 2 elapsed time reset
First data
Last data
Timer 0 elapsed time reset
Response message
Command message
Last dataFirst data
1 byte
Q series C24
ready to receive
data state
Timer 1 elapsed time reset