Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 13

3.3.3 Reducing the link refresh time ........................................................................................................ 3- 47
3.3.4 Reduction of the link scan time ....................................................................................................... 3- 52
3.3.5 Control station shift time .................................................................................................................. 3- 52
4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION
4.1 Procedures Before Starting the Operation ............................................................................................ 4-
4.2 Part Names and Settings ....................................................................................................................... 4-
4.2.1 QJ71LP21, QJ71LP21-25, QJ71LP21S-25, QJ71LP21G, QJ71LP21GE .................................... 4-
4.2.2 QJ71BR11 ....................................................................................................................................... 4-
4.2.3 QJ71NT11B ..................................................................................................................................... 4-
4.3 Loading and Installation ......................................................................................................................... 4-
4.3.1 Handling precautions ...................................................................................................................... 4-
4.3.2 Installing and uninstalling the module ............................................................................................. 4- 10
4.3.3 Stopping the CPU module (unintentional output prevention) ........................................................ 4- 11
4.3.4 Checking the input power supply voltage ....................................................................................... 4- 11
4.4 Powering On .......................................................................................................................................... 4- 11
4.4.1 Checking the on status of the POWER LED of the power supply module .................................... 4- 11
4.4.2 Checking the on status of the RUN LED of the network module .................................................. 4- 11
4.5 Standalone Check of the Network Module (Offline Tests) ................................................................... 4- 12
4.5.1 Self-loopback test ............................................................................................................................ 4- 13
4.5.2 Internal self-loopback test ............................................................................................................... 4- 15
4.5.3 Hardware test .................................................................................................................................. 4- 17
4.6 Cable Connection .................................................................................................................................. 4- 19
4.6.1 Optical loop system ......................................................................................................................... 4- 19
4.6.2 Coaxial bus system ......................................................................................................................... 4- 22
4.6.3 Twisted bus system (when using a shielded twisted pair cable) ................................................... 4- 27
4.6.4 Twisted bus system (when using CC-Link Ver. 1.10-compatible cable) ....................................... 4- 29
4.7 Offline Tests from GX Developer .......................................................................................................... 4- 30
4.7.1 Station-to-station test ...................................................................................................................... 4- 30
4.7.2 Forward loop/reverse loop test (optical loop system only) ............................................................ 4- 36
4.8 Network Diagnostics from GX Developer (Online Tests) ..................................................................... 4- 41
4.8.1 Loop test (optical loop system only) ............................................................................................... 4- 42
4.8.2 Setup confirmation test (optical loop, coaxial bus system only) .................................................... 4- 43
4.8.3 Station order check test (optical loop system only) ........................................................................ 4- 44
4.8.4 Communication test......................................................................................................................... 4- 45
5 PARAMETER SETTINGS
5.1 Setting the Number of Modules (Network Type) .................................................................................. 5-
5.2 Network Settings .................................................................................................................................... 5-
5.2.1 Starting I/O No. ................................................................................................................................ 5-
5.2.2 Network No. ..................................................................................................................................... 5-
5.2.3 Total stations ................................................................................................................................... 5- 10
5.2.4 Group No. ........................................................................................................................................ 5- 10
5.2.5 Mode ................................................................................................................................................ 5- 11
5.2.6 Communication speed setting (twisted bus system only) .............................................................. 5- 12
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