IAI America ROBO Cylinder Series - Manual (Page 74)

5. Modbus RTU
66
Modbus
5.3.2 Alarm Detail Description Reading <<ALAO, ALCO, ALTO>>
(1) Function
This bit reads the alarm codes, alarm detail codes and alarm occurrence time that last occurred.
When any alarm is not issued, it is “0
H
”. [Refer to 4.3.2 (1) to (3) for detail]
(2) Query format
Field Number of data items
(number of bytes)
RTU mode
8-bit data
Remarks
Start None Silent interval
Slave address [H] 1 Arbitrary Axis number + 1 (01
H
to 10
H
)
Function code [H] 1 03 Register reading
Start address [H] 2 0500 Alarm detail code
Number of registers [H] 2 0006 Reading addresses 0500
H
to
0505
H
Error check [H] 2 CRC (16 bits)
End None Silent interval
Total number of bytes 8
(3) Response format
A response message contains 16 bits of data per register.
Field Number of data items
(number of bytes)
RTU mode
8-bit data
Remarks
Start None Silent interval
Slave address [H] 1 Arbitrary Axis number + 1 (01
H
to 10
H
)
Function code [H] 1 03 Register reading
Number of data bytes [H] 1 0C Reading 6 registers = 12
bytes
Data 1 [H] 4 Alarm detail code
Alarm address
Alarm detail code(0500
H
) [Hex]
Alarm address(0501
H
) [Hex]
Data 2 [H] 4 Alarm code Alarm code [Hex]
Data 3 [H] 4 Alarm occurrence
time (Note1)
Alarm occurrence time [Hex]
Error check [H] 2 CRC (16 bits)
End None Silent interval
Total number of bytes 17
Note 1 The contents of data differ for the case when the model is equipped with RTC (calendar)
function and RTC is effective [1] and the case when RTC is ineffective or the model is not
equipped with RTC [2].ᴾ
[1] It shows the alarm occurrence time. [2] It shows the time [msec] passed since the power
was turned on.ᴾ