Hitachi EH-150 Series - Error Detection in Modbus Slave Mode

Chapter 6 Communication Mode
6 - 72
Modbus Slave
6.4.5 Error detection in modbus slave mode
Since TRNS 9 command is not used in normal operation in case of modbus slave mode, error indication is different
from other operation modes.
 At initial setting
The execution result is shown in t parameter and return code is in s-parameter. If error flag (t+2) of t parameter
comes ON after TRNS 9 command execution, some type of error has occurred.
Table 6.17 Modbus slave mode initial setting error list
No.
Error
code
Item
Error
level
Details
1
HFF
CPU error
---
Operation of EH-SIO stops due to serious error of CPU module.
2
---
Watchdog timer error
Serious
error
MPU in EH-SIO does not work due to watchdog timer error.
3
H03
OS system error
Serious
error
Error is detected in system OS of EH-SIO.
4
H51
Number of entries over
Warning
- Slot number is wrong.
- The number of slave functions or simple-link functions is over the
max. number.
5
H81
Command
not-supported
Warning
- Command not supported.
- Initializing duplicates.
6
H82
Initial setting error
Warning
- Parameter error in initializing
- Initializing incomplete