Troubleshooting - Hitachi EH-150 Series Applications Manual

Chapter 7 System setup
7.3

Troubleshooting

 Main check flow
Power ON
Error LED off?
YES
CPU RUN
Initial setting for EH-SIO
Initial Setting
normal?
YES
Free protocol
mode?
NO
Modbus master
mode?
NO
Modbus slave
mode?
NO
Hi-Protocol
mode?
NO
Please refer to the flow of
Simple data link mode
A
Reboot the power several times.
If this does not solve, replace the module.
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.
NO
A
NO
YES
Please refer to the flow of
Free protocol mode
YES
Please refer to the flow of
Modbus master mode
YES
Please refer to the flow of
Modbus slave mode
YES
Please refer to the flow of
Hi-Protocol mode
Ladder program
normal?
NO
Please correct a ladder
program.
7 - 4
YES
A