Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 15

7.4.5 (3) Requesting transient transmission to other stations (J(P)/G(P).REQ) .................................... 7- 72
7.4.5 (4) Reading/writing word devices of other stations (J(P).ZNRD, J(P).ZNWR) .............................. 7- 82
7.4.5 (5) Remote RUN/Remote STOP (Z(P).RRUN, Z(P).RSTOP) ....................................................... 7- 91
7.4.5 (6) Reading and writing clock data of other station CPU modules (Z(P).RTMRD, Z(P).RTMWR)
......................................................................................................................................................... 7- 100
7.4.6 Setting the clock to stations on a network with GX Developer ...................................................... 7- 109
7.5 Starting the Interrupt Sequence Program ............................................................................................. 7- 110
7.5.1 Interrupt setting parameters ............................................................................................................ 7- 111
7.5.2 Interrupts using the RECVS instruction .......................................................................................... 7- 113
7.5.3 Interrupts by the link devices (LB/LW/LX) for cyclic transmission ................................................. 7- 114
7.5.4 Interrupts by the link special device (SB/SW) ................................................................................ 7- 116
7.5.5 Message reception "one scan completion" instruction (Z.RECVS) ............................................... 7- 117
7.5.6 Application example ........................................................................................................................ 7- 121
7.6 Multiplex Transmission Function (Optical Loop System) ..................................................................... 7- 123
7.7 Simple Dual-Structured Network (High Performance model QCPU and Process CPU) .................... 7- 124
7.8 Stopping/Restarting the Cyclic Transmission and Stopping Link Refreshing (Network Test) ............ 7- 129
7.9 Increasing the Number of Send Points by Installing Multiple Modules with the Same Network
(High Performance model QCPU, Process CPU, Redundant CPU, and Universal model QCPU) ... 7- 132
7.10 Configuring a Network with a Redundant System .............................................................................. 7- 134
7.10.1 Outline of the redundant system operation .................................................................................. 7- 134
7.10.2 Precautions for network configuration including a redundant system ......................................... 7- 137
7.10.3 Pairing setting in a redundant system .......................................................................................... 7- 145
7.10.4 Redundant settings in a redundant system .................................................................................. 7- 149
7.10.5 System switching request to the control system CPU ................................................................. 7- 150
7.10.6 Function for returning to control station in a redundant system .................................................. 7- 152
7.10.7 Data retention time for system switching ...................................................................................... 7- 153
7.10.8 Routing via a redundant system ................................................................................................... 7- 159
8 TROUBLESHOOTING
8.1 Network Diagnostics (Network Monitor) ................................................................................................ 8-
8.1.1 Host information .............................................................................................................................. 8-
8.1.2 Other station information ................................................................................................................. 8-
8.1.3 Network monitor details ................................................................................................................... 8- 11
8.1.4 Error history monitor ........................................................................................................................ 8- 15
8.2 Troubleshooting ..................................................................................................................................... 8- 18
8.2.1 Items to be checked first ................................................................................................................. 8- 23
8.2.2 Data link failure on the entire system ............................................................................................. 8- 24
8.2.3 Data link failure caused by reset or power-off of each station ....................................................... 8- 24
8.2.4 Cyclic data is 0 caused by reset or power-on of each station ....................................................... 8- 26
8.2.5 Data link failure of a specific station ............................................................................................... 8- 27
8.2.6 Data link failure in MELSECNET/H Extended mode ..................................................................... 8- 27
8.2.7 Data link failure in MELSECNET/H twisted bus system ................................................................ 8- 28
8.2.8 Data link in a redundant system ..................................................................................................... 8- 28
8.2.9 Send/received data failure .............................................................................................................. 8- 29
8.2.10 Link dedicated instruction not complete ....................................................................................... 8- 30
8.2.11 Checking online for reverse optical fiber cable connection ......................................................... 8- 31
8.2.12 When different network types exist in the same network ............................................................ 8- 33
8.3 Error Codes ............................................................................................................................................ 8- 34
8.3.1 How to check error codes ............................................................................................................... 8- 34
A - 13
8- 1 to 8-53
2
5
7
A - 13