Mitsubishi FX3U Series User Manual page 37

FX Series Programmable Controllers
3U
User's Manual - MODBUS Serial Communication Edition
Special Data
Register
CH1 CH2
D8405 D8425
D8406 D8426
D8407 D8427
D8408 D8428
D8409 D8429
Name Valid
Communication
Format M, S This device stores the communication format set in the PLC.
Display
Displays the End Of Message character used in ASCII mode.
By default this is the LF (0x0A) character.
Special clear conditions:
ASCII Input
1) Power on
M, S
Delimiter
Note: In the Master this character can be changed by the user
Last step number of the MODBUS command that was
executed (0 if no command is executed in the program).
After the ADPRW command has been executed the last step
number will be retained in the device register.
Special clear conditions:
Step Number
M 1) Power on
Being Executed
2) STOP to RUN
Note: If the step number is greater than 32767 the value will
The current value of retries that the master is sending to
process the request.
Current Retry
Special clear conditions:
M
Value
1) Power on
2) STOP to RUN
3) Next MODBUS command
After the master sends a request and no response is received
from the slave within the specified time, the master will retry to
send the message or terminate the processing of the command
with a time out error depending on the setting of the "number of
retries" (D8412, D8432).
Slave Response
M
Timeout
Valid values: 0 to 32767[ms]
0 will default the timeout to 3 seconds
Note: This value can also be changed before each command
6 Related Devices and Communication Status
Detailed description
program. For the slave this is a read only device. Refer
to the Change Ascii Input Delimiter command in the
section 8.2.
become a negative number. To see the step numbers
above 32767 the user must convert the step number to
an unsigned value.
execution.
6.1 Special Data Registers
R / W
R
R,W
R
R
R,W
33
1
2
3
4
5
6
7
8
9
10