YASKAWA SVC User Manual page 590

Read Alarms/Warnings Command
Reads the alarm/warning information from the I/O Module.
 Command Format
Output Registers
7 6 5 4 3 2 1 0
OW Read Alarms/Warnings (= 1)
OW + 1
Command Control
OW + 2
OW + 3
OW + 4
OW + 5
OW + 6
OW + 7
 ALM_RD_MOD: Read Mode
0: Reads the current alarms or warnings
Reads up to 12 alarms or warnings (one word per alarm/warning, read to ALM_DATA).
If there are less than 12 current alarms or warnings, the remaining portion of ALM_DATA is filled with
zeroes.
1: Reads alarm/warning history
Reads up to 12 alarms or warnings (one word per alarm/warning, read to ALM_DATA).
If there are less than 12 current alarms or warnings, the remaining portion of ALM_DATA is filled with
zeroes.
2: Reads details on a current alarm or warning
3: Reads details on an alarm/warning history item
All other bits: Reserved for system.
 ALM_INDEX: Alarm Index
0 to 11: Specifies the order of occurrence.
Specify 0 to read the latest alarm information.
All other bits: Reserved for system.
This register is valid only when ALM_RD_MOD is 2 or 3.
Information
 ALM_DATA: Alarm/Warning Code
This gives the code of the alarm or warning.
This is a vendor-specific register when ALM_RD_MOD is 2 or 3.
Information
If an ALM_INDEX is specified for which no alarm or warning has occurred, the contents
of ALM_DATA will be all 0.
Not used.
ALM_RD_MOD
ALM_INDEX
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11.3 MECHATROLINK-III I/O Module Settings
11.3.4 I/O Command Details
Input Registers
7 6 5 4 3 2 1 0
IW Read Alarms/Warnings (= 1)
Master Status
IW + 1
Command Status
IW + 2
ALM_RD_MOD
IW + 3
ALM_INDEX
IW + 4
ALM_DATA1 Low
IW + 5
ALM_DATA2 Low
IW + 6
ALM_DATA3 Low
IW + 7
ALM_DATA4 Low
High
High
High
High
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