Changing The Data Communications Monitoring Times - Mitsubishi MELSEC L Series User Manual

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.
Monitoring time
No-reception
Format 0
1) monitoring time
Format 1
(timer 0)
Response monitoring time
2)
(timer 1)
Transmission monitoring time
3)
(timer 2)
4) Message wait time
(Example) Data communications using an MC protocol
External
device
Programmable
controller CPU
Timer 0 monitoring time
Timer 0 elapsed time reset
6 - 1
6 CHANGING THE DATA COMMUNICATIONS MONITORING TIMES
Protocol that can monitor the time
Q series C24
default value
MC
0 bytes
(Infinite wait)
5 s
3 min
0 ms
Command message
First data Last data
Timer 1 monitoring time
Message wait time
Timer 1 elapsed time reset
Non Bi-
procedure directional
Transmission time for the set
number of bytes. (depends on
the transmission rate)
For bidirectional protocol, this is
⎯
valid for transmission only.
⎯ ⎯
No wait time
1 byte
First data Last data
Response message
Timer 2 monitoring time
Timer 2 elapsed time reset
Notes
⎯
Q series C24
ready to receive
data state
H/W gate OFF time
6 - 1
6