6.3 Main Commands
6-11
6.3.6 Read Alarm or Warning (ALM_RD: 05H)
* Alarm occurrence history is saved on E
2
PROM, and will not be lost if power goes OFF.
• Details of ALM_RD_MOD
Byte ALM_RD Description
Command Response
1 05H 05H Processing
classifications
Control com-
mand group
Synchronization
classifications
Asynchronous
2 ALARM Processing time Refer to
• Details of
ALM_RD_MOD
Subcommand Cannot be used
3STATUS• Reads the following alarm or warning status.
- Current alarm/warning status
- Alarm status history* (warning history is not preserved.)
• The ALM_RD_MOD specifications are shown in the following table.
• Alarm and warning codes are set in ALM_DATA from byte 6 in their order of
detection, and 0 is set in the bytes that are blank in the table. Accordingly, the
data in byte 6 is for the latest alarm or warning codes.
• A warning will occur and the command will be ignored in the following cases.
- If a Digital Operator is connected: Command warning1 (A.95A)
- If ALM_RD_MOD is not within range: Data setting warning2 (A.94B)
4
5 ALM_RD_
MOD
ALM_RD_
MOD
6 ALM_DATA
7
8
9
10
11
12
13
14
15
16 WDT RWDT
ALM_RD_MOD Description Processing
Time
0
Read current alarm/warning status
10 items max. (sixth to fifteenth byte)
Within commu-
nication cycle
1
Read alarm status history
10 items max. (sixth to fifteenth byte)
(Warning history is not preserved.)
Within 60 ms
2
Gets the detailed information of current alarm or warn-
ing one by one.
Set the occurrence order from 0 (the latest) to 9 for the
alarm index.
Witin 12 ms
3
Gets the detailed information of alarm status history one
by one.
Set the occurrence order from 0 (the latest) to 9 for the
alarm index.
Byte
6
Alarm index
0
Command
Alarm index
Alarm code
Response
7-8
Byte
6
Alarm index
0
Command
Alarm index
Alarm code
Response
7-8
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