Mitsubishi QJ71LP21 Reference Manual page 10

3.1.2 Coaxial cable system performance specifications .......................................................................... 3- 2
3.1.3 Optical fiber cable specifications ..................................................................................................... 3- 3
3.1.4 Coaxial cable specifications............................................................................................................. 3- 4
3.2 Function Specifications ........................................................................................................................... 3- 7
3.2.1 Cyclic transmission function (Periodic communication).................................................................. 3- 8
(1) Communicating with input/output module....................................................................................... 3- 8
(2) Communicating with intelligent function module............................................................................. 3- 9
3.2.2 RAS functions................................................................................................................................... 3-14
(1) Output reset function for communication errors ............................................................................. 3-14
(2) Automatic return function................................................................................................................. 3-14
(3) Loopback function (Optical loop system)........................................................................................ 3-15
(4) Station detach function (Coaxial bus systems)............................................................................... 3-17
(5) Transient transmission enabled even at CPU module error .......................................................... 3-18
(6) Checking the transient transmission abnormal direction time........................................................ 3-19
(7) Diagnostic functions......................................................................................................................... 3-20
(8) Configuration of a redundant power supply on a remote I/O station ............................................. 3-21
(9) Online module change in a remote I/O station ............................................................................... 3-24
3.3 Link Data Send/Receive Processing Time Specifications..................................................................... 3-30
3.3.1 Link data send/receive processing .................................................................................................. 3-30
3.3.2 Transmission delay time .................................................................................................................. 3-33
3.3.3 Switching time from the multiplexed remote master station to the multiplexed remote
sub-master station in a multiplexed remote I/O network................................................................ 3-46
3.3.4 Output holding time during system switching in the multiplexed remote I/O network for
redundant system ............................................................................................................................ 3-47
4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION
4.1 Procedures Before Starting the Operation............................................................................................. 4- 1
4.2 Network Module Names and Settings.................................................................................................... 4- 2
4.2.1 QJ71LP21, QJ71LP21-25, QJ71LP21G, QJ71LP21GE, QJ71BR11 (Remote master station) ... 4- 2
4.2.2 QJ72LP25-25, QJ72LP25G, QJ72LP25GE, QJ72BR15 ............................................................... 4- 5
4.3 Installing and Uninstalling the Module.................................................................................................... 4- 7
4.4 Stopping the CPU (Unintentional Output Prevention) ........................................................................... 4- 9
4.5 Checking the Input Power Supply Voltage............................................................................................. 4- 9
4.6 Powering On............................................................................................................................................ 4- 9
4.6.1 Checking the on status of the POWER LED of the power supply module .................................... 4- 9
4.6.2 Checking the on status of the RUN LED of the network module ................................................... 4- 9
4.7 Standalone Check of the Network Module (Offline Tests) .................................................................... 4-10
4.7.1 Self-loopback test............................................................................................................................. 4-11
4.7.2 Internal self-loopback test ................................................................................................................ 4-12
4.7.3 Hardware test ................................................................................................................................... 4-13
4.8 Cable Connections.................................................................................................................................. 4-14
4.8.1 Optical loop system.......................................................................................................................... 4-14
4.8.2 Coaxial bus system .......................................................................................................................... 4-16
4.9 Offline Tests from GX Developer............................................................................................................ 4-21
4.9.1 Forward loop/reverse loop test (Remote master station only)........................................................ 4-21
4.10 Network Diagnostics from GX Developer (Online Tests) .................................................................... 4-24
4.10.1 Loop test (optical loop system only) .............................................................................................. 4-25
4.10.2 Setup confirmation test .................................................................................................................. 4-26
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