Hitachi EH-150 Series - Troubleshooting

Chapter 7 System setup
7 - 4
7.3 Troubleshooting
 Main check flow
Power ON
Error LED off?
CPU RUN
Initial Setting
normal?
Free protocol
mode?
Modbus master
mode?
Initial setting for EH-SIO
Ladder program
normal?
Please correct a ladder
program.
Reboot the power several times.
If this does not solve, replace the module.
Please refer to the flow of
Free protocol mode
Please refer to the flow of
Simple data link mode
Please refer to the flow of
Hi-Protocol mode
A
A
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
A
Modbus slave
mode?
NO
YES
Hi-Protocol
mode?
NO
YES
Please refer to the flow of
Modbus master mode
Please refer to the flow of
Modbus slave mode
Reference :
 EH-SIO does not start communication, unless initial setting is completed. Initial setting completion of the
communication port can be checked with the "XIC flag" of the status register.
For port 1  Xus13 (u : Unit No. , s : Slot No. )
For port 2  Xus29 (u : Unit No. , s : Slot No. )
 The self-check function is supported by EH-SIO of software ver. 2.1. Failure of hardware is detectable by using the
self-check function. Please refer to "8.3 Self-check mode" for further information.