User`s manual

72
FX3U Series Programmable Controllers
User’s Manual - MODBUS Serial Communication Edition
7 MODBUS Standard Commands
7.13 Get Communications Event Log (Command Code: 0x0C)
7.13 Get Communications Event Log (Command Code: 0x0C)
Acquires the communications event log of the FX-Series MODBUS Communication ADP into the master.
1) Request message format (Master → Slave)
2) Response message format (Slave → Master)
(When completed normally)
*1. Since the FX-Series MODBUS Communication ADP does not support any program commands,
0000H is always stored.
*2. Refer to the following for the relevant counts, count clear methods and precautions.
Refer to Section 7.12.
*3. Refer to the following for the relevant counts, count clear methods and precautions.
Refer to Chapter 6.
*4. For information on the Communication Event Log and Communication event log Timing and
Communication event log Format refer to Section 9.5.
(When completed with an error)
*5. Exception and error codes are stored in special data registers and special auxiliary relays in the case
of error completion. Refer to Chapter 6 for storage location, confirmation methods, and other detailed
contents.
Function code
Function
code
(0C
H)
Data
(L) (L) (L)
Function code
Function
code
(0C
H)
Number of
read bytes
Program command
status
(0000
H) *
1
Communications event
count value
(0000
H to FFFFH) *
2
Bus message count value
(0000
H to FFFFH) *
3
Communications
event log No. 0 *
4
Communications
event log No. 63
(Number of read bytes)
(H) (H)
(H)
Data
Function code
Function
code
(8C
H)
Exception
code *
5