Mitsubishi Electric QJ71MB91 User Manual page 58

4
MODBUS STANDARD FUNCTIONS
Function
Sub-function
code
code
(Sub code)
16
17
18
08
19
20
11 -
12 -
15 -
4
- 3 4.1 MODBUS Standard Function Support List
Table4.1 MODBUS standard function support list (continued)
Function
Reads out the number of NAK
Return slave NAK count responses to the master.
The QJ71MB91 always returns "0".
Reads out the number of busy
Return slave busy count responses to the master.
The QJ71MB91 always returns "0".
To the master, reads out the number of
Return bus character
times the request message size
overrun count
exceeds the upper limit.
Reads the IOP overrun error counter
value to the master.
The QJ71MB91 returns to the master
Return IOP overrun
the number of times the request
error count
message size exceeds the upper limit.
(Same as the Return bus character
overrun count)
Clears the overrun error counter and
Clear overrun counter flag.
and flag The QJ71MB91 clears the character
overrun error counter value.
Acquires the number of messages
whose requested processing (read/
write, diagnostics, etc.) have been
Get communications
normally completed.
event counter
Whether the action corresponding to the
request message is normally completed
or not can be checked.
Get communications Acquires the communications event log
event log of the QJ71MB91 into the master.
Writes values (ON/OFF) to multiple
Write multiple coils
coils.
Accessible
Description devices per
1968 points
Broadcast Reference
message
Section
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4.11.12
Section
-
4.11.13
Section
-
4.11.14
Section
-
4.11.15
Section
-
4.11.16
Section
-
Section
-
1 to Section
(Continued on next page)
4.12
4.13
4.14