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Read Alarm or Warning (ALM_RD)
The ALM_RD command is used to read the following information about the status of faults
and alarms.
• Present fault and alarm status list
• Fault history (Alarms are not saved in the history.)
• Details of faults
In the following case, a warning is generated and the command is ignored.
• If ALM_RD_MOD is other than a set value: Data setting alarm (A.94)
The fault history is saved in EEPROM and is kept even when the control power is inter-
rupted.
The following table shows the specifications for ALM_RD_MOD and ALM_DATA.
If the fault history (ALM_RD_MOD = 1) is selected, the fault code (1 byte) is entered in
order of detection from ALM_DATA byte 6, and byte 6 is refreshed with the most recent
fault code. If no fault occurred, 00H is displayed to indicate normal operations.
Byte Command Response
1 ALM_RD ALM_RD
2 ALARM
3 STATUS
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 ALM_DATA Max.
Processing
Time
Constant No.
0 Present fault (byte 6), past fault (byte 7) 0.1 s U2-01 and U2-02
1 Fault history (Alarms are not retained in the history.)
2 max. (bytes 6 and 7)*
0.1 s U3-01 and U3-04
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