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CHAPTER 7 TROUBLESHOOTING
7
7.2 Network Diagnostics
7.2.4 Error history monitor
(3) Reason for transmission stop
7.2.4 Error history monitor
(1) Error history monitor
The history of forward/reverse loop errors, communication errors, and transient transmission errors can be
checked. The details of the error history can be displayed and the error history can be cleared.
Item Description
Normal Data communications are being performed normally.
There is a stop instruction (All) The cyclic transmission of all the stations has been stopped by the host station or other stations.
There is a stop instruction (Host) The cyclic transmission of the host station has been stopped.
Stop instruction present () The cyclic transmission of the host station has been stopped by other stations (station number ).
No Parameter The parameters have not been received.
Illegal Parameter The set common parameters are faulty.
Host PLC Error A moderate error or major error has occurred in the CPU module of the host station.
Suspend Communication A data link error has occurred in the host station.
No. Item SB/SW Description
Network info.
The information same as "Host information" is displayed. ( Page 75, Section 7.2.1)
1) Loop switching SW00CE
The number of loop switchings is displayed.
<Cause> Such as power-on/off of a station, a cable error, and noise
<Action> Refer to Point in the next page.
2) Transient transmission SW00EE
The number of the transient transmission errors is displayed.
<Cause> Such as power-off of the target station, down of the CPU module of the target station, a
cable error, and noise
<Action> Check the error code for the transient transmission error on the Error history detail
monitoring window, and take the corrective action referring to Page 88, Section 7.4.
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