Hitachi WJ Series User Manual page 340

Chapter 11
 When reading the status of 16 consecutive coils from coil number 0001h, the order of the data
is as follows. Data 1 is byte data transmitted first.
Data 1
Data 2
 If the read coil extends beyond the range of the defined coil number, coil data outside the range
is sent as "0".
 If the command cannot be executed successfully, an exceptional response is returned. For
details, refer to "11.2.9 Exceptional Responses".
 Reads coil numbers 0010h to 0058h can also be substituted by holding register reads register
number 1E01h to 1E05h. As an example, the bit-structure of the holding register 1E01h is
shown below. For details, refer to "18.1.1 List of Modbus Coil Numbers".
■ (Example) Bit-structure of holding register 1 E 01 h
(Holding register allocation status of coil number 0010h to 001Fh)
bit Symbol
15 ONT
14 RNT
13 TRQ
12 UV
11 -
10 OTQ
9 FA3
8 AL
Bit7 Bit6 Bit5
0008h 0007h 0006h
0010h 000Fh 000Eh
Item
Accumulated power-on time
over
Accumulated operation time
over
Torque limited
Undervoltage
-
Over-torque/under-torque
Set frequency reached
Alarm
Bit4 Bit3
0005h 0004h
000Dh 000Ch
bit Symbol
7 OD
6 OL
5 FA2
4 FA1
3 RUN
2 -
1 IRDY
0 Dir
11-2-2
RS485 Communication
Bit2 Bit1 Bit0
0003h 0002h 0001h
000Bh 000Ah 0009h
Item
Over deviation for PID control
Overload warning notice
Set frequency overreached
Constant-frequancy reached
Running
-
Inverter ready
Rotation direction (0: Forward/1:
Reverse)