User`s manual
94
FX3U Series Programmable Controllers
User’s Manual - MODBUS Serial Communication Edition
9 Slave Specification
9.5 Communication Event log
9.5 Communication Event log
This section details the communication event log details for the MODBUS slave device.
9.5.1 Communications event log
1. Communications event log information in the communication status area
If configured in D8415/D8435 and D8416/D8436 the event log data is displayed in the communication status
area. The events of the event log are stored to the communication status area as shown below. For more
information on Communication Status refer to Section 6.4.
D8415 = 11H - i.e. store event counter and event log into D devices
D8416 = 100 - i.e. head device is set to D100
Note
If the number of communications event logs exceeds 64, the oldest log is deleted and the latest log is stored
to Communications event log 0.
2. Communications event log response format if ADPRW command is used (For command
code 0x0C "get communication event log")
When executing the ADPRW command (command code 0x0C "Get Communication Event Log") the slaves
response data is stored in the following format:
Example: Read event log from slave 4
ADPRW K4, H0C, K0, K0, D2000
Note
If the number of communications in the event log exceeds 64, the oldest log is deleted and the latest log is
stored to Communications event log 0.
High byte Low byte
D100-
D109
Event and Error counter.
For details refer to Section 6.4
D110 event log length in bytes
D111 event log byte 1 event log byte 0
D112 event log byte 3 event log byte 2
D113 event log byte 5 event log byte 4
…
…
…
D141 event log byte 61 event log byte 60
D142 event log byte 63 event log byte 62
High byte Low byte
D2000
Programming state
FFFFH = programming command in process
0000H = no program. Command in process
(always 0000H in case of FX
3U slave)
D2001 Event counter
D2002 Bus message counter
D2003 event log length in bytes
D2004 event log byte 1 event log byte 0
D2005 event log byte 3 event log byte 2
D2006 event log byte 5 event log byte 4
…
…
…
D2034 event log byte 61 event log byte 60
D2035 event log byte 63 event log byte 62
New values
Old values
New values
Old values