Mitsubishi Q12PRHCPU - Page 247

6
REDUNDANT SYSTEM NETWORKS
6.2 Redundant System Network Overview
6.2.2 MELSECNET/H Remote I/O network
6 - 24
1
OVERVIEW
2
SYSTEM CONFIGURATION
3
TRACKING CABLE
4
PROCEDURE FOR STARTING UP A REDUNDANT SYSTEM
5
REDUNDANT SYSTEM FUNCTIONS
6
REDUNDANT SYSTEM NETWORKS
7
PROGRAMMING CAUTIONS
8
TROUBLESHOOTING
(9) Operation Mode Setting for Error Occurrence
For Redundant CPUs and MELSECNET/H remote I/O stations, the operation mode
for occurrence of "fuse blown" and "module verify error" can be preset in PLC RAS
settings in PLC parameter.
*2
Different error-time operation modes can be set to the Redundant CPU (remote
master station) and remote I/O station.
When an error (fuse blown or module verify error) occurs in a Redundant CPU
(remote master station) and a remote I/O station, the data link and output of the
remote I/O station is determined by the combination of the error-time operation mode
settings of the Redundant CPU (remote master station) and remote I/O station.
The following describes the data link and output status of the remote I/O station
determined by the combination of the parameter settings.
(a) Operation when error occurs in Redundant CPU (remote master station)
* 2 : Refer to the following manual for details of the PLC RAS setting.
QCPU User's Manual (Function Explanation/Program Fundamentals)
* 3 : Set the output mode for error occurrence in the I/O assignment detailed setting of the PLC
parameter dialog box.
Refer to the following manual for details of the I/O assignment detailed setting.
QCPU User's Manual (Function Explanation/Program Fundamentals)
Diagram 6.19 In the case of Redundant CPU Diagram 6.20 In the case of Remote I/O Station
Table6.3 Operation When Error Occurs in Redundant CPU (Remote Master Station)
Settings of operation mode for
error occurrence
Redundant CPU
control status
Data link operation of
MELSECNET/H remote I/O
network
Output operation from remote
I/O station
Redundant
CPU
Remote I/O
station
Stop
Stop
Stops control.
(Stop error)
All stations stop data link.
Depends on the output mode
hold/clear settings for error
occurrence.
*3
Continue
Continue
Stop Continues control.
(Continue error)
All station continue data link. All stations output normally.
Continue