Hitachi SJ Series User Manual page 503

Chapter 14
14.4.2 Reading out the content of retention
register [03h]
• Read out the contents of consecutive retention registers
as much as specified, from the specified retention
register addresses.
(Example)
To read out a past trip history from the inverter with slave
address 5.
(To read out the factors and output frequency of trip monitor
1.)
----
Retention register No.
Data
Query
Field Name
1 Slave address *1)
2 Function code
3 Register starting No. (high) *2)
4 Register starting No. (low) *2)
The number of retention
5
registers (high)
The number of retention
6
registers (low)
7 CRC-16 (high)
8 CRC-16 (low)
!
*1) A broadcasting cannot be executed.
*2) Note that the value of starting number is one less than
the actual number. Specify the value of "(Register No.)
-1".
*3) Data as much as the number of data bytes is
transferred. In this example, two retention registers are
returned; hence 4 bytes.
A
• The data received as a response is read as shown below.
Response buffer
Retention register starting No.
Response data
Trip description
• When a readout of retention register contents cannot be
executed normally, see "3.9 Exceptional Responses".
Trip monitor 1 (factor)
03E9h
Overvoltage (E007) (0007h)
Response
Example (HEX)
05
03
03
E8
00
03
84
3F
4 5
+0 (hi) +0 (lo)
00h 07h
Overvoltage trip
(0007h)
14-12
RS485 Communication
Trip monitor 1 (output frequency)
03EAh, 03EBh
60.00Hz (0000h, 1770h)
Field Name
1 Slave address
2 Function code
3 Data bytes *3)
4 Register starting No. (high)
5 Register starting No. (low)
6 Register starting No. +1 (high)
7 Register starting No. +1 (low)
8 Register starting No. +2 (high)
9 Register starting No. +2 (low)
10 CRC-16 (high)
11 CRC-16 (low)
6 7
+1 (hi) +1 (lo) +2 (hi)
00h 00h
Trip frequency 60.00Hz
(00001770h)
Example (HEX)
05
03
06
00
07
00
00
17
70
A8
61
8 9
+2 (lo)
17h 70h