Mitsubishi FX3U Series User Manual page 38

FX Series Programmable Controllers
3U
User's Manual - MODBUS Serial Communication Edition
Special Data
Register
CH1 CH2
D8410 D8430
D8411 D8431
D8412 D8432
D8413 D8433 Not used
D8414 D8434
34
Name Valid
Turn Around
M
Delay
Message to
M, S
Message delay
Number Of
M
Retries
-
Slave Node
S
Address
6 Related Devices and Communication Status
Detailed description
The turnaround delay defines the minimum delay time that the
master has to wait after the transmission of a broadcast
message before transmitting the next request.
This delay allows the slaves to process the broadcast message
and prepare the reception of the next request.
Valid values: 0 to 32767 [ms]
0 will set the timeout to 400 ms
Note 1:This value can also be changed before each command
execution.
Note 2:If a value less than 3.5 character times (end of
message detection time) is selected, the master will
wait for at least 3.5 character times.
Note 3:The Turn Around delay and Message to Message delay
must be set for the slowest slave in the network.
This value defines the minimum waiting time between two
messages. This time is used to detect the end of a message.
Valid values: 0 to 16382 (ms)
0 will be interpreted as 3.5 character times according to the
selected baud rate.
If a value less than 3.5 character times is selected, the master
will at least wait 3.5 character times.
Note 1:This value should be fixed during processing.
Note 2:This value can also be changed before each command
execution when setting up the network.
Note 3:The Turn Around delay and Message to Message delay
must be set for the slowest slave in the network.
In the situation where a slave does not respond within the set
time by the Slave Response Timeout the master will try to
retransmit the message a set number of retries before it
terminates the command processing with a timeout error.
Valid values: 0 to 20 [times]
If a value of 20 or more is set the number of retries used by the
master is set to 20.
Slave node address
Valid range: 1 to 247
Note: If during the initialization a value outside the valid range
is detected, the configuration is invalid and the slave will
not respond to any requests.
6.1 Special Data Registers
-
R / W
R,W
R,W
*1
R,W
-
*1
R,W