Mitsubishi Electric MELSEC FX Series User Manual page 12

FX communication
4.2 Setting....................................................................................................................4-3
4.2.1 Setting the Station No. (D8176) ................................................................................................ 4-3
4.2.2 Setting the Total Number of Slave Stations (D8177) ............................................................... 4-3
4.2.3 Setting the Refresh Range (D8178).......................................................................................... 4-4
4.2.4 Setting Retry Count (D8179)..................................................................................................... 4-5
4.2.5 Setting Comms Time-out (D8180) ............................................................................................ 4-5
4.2.6 Program Used for Setting ........................................................................................................ 4-6
4.3 Example Program ..................................................................................................4-7
4.3.1 System Configuration ............................................................................................................... 4-7
4.3.2 Operations ................................................................................................................................ 4-7
4.3.3 Example of Setting Program ..................................................................................................... 4-8
4.3.4 Example of Error Program ....................................................................................................... 4-8
4.3.5 Example of Operation Program ................................................................................................ 4-9
5. Parallel link.............................................................................................. 5-1
5.1 Related Flags and Data Registers ........................................................................5-1
5.2 Mode and Link Device ...........................................................................................5-2
5.2.1 Normal Mode (Special auxiliary relay M8162: OFF) ................................................................ 5-2
5.2.2 High Speed Mode (Special auxiliary relay M8162: ON) ........................................................... 5-3
5.3 Example Program ..................................................................................................5-4
5.3.1 Normal Mode ............................................................................................................................ 5-4
5.3.2 High Speed Mode ..................................................................................................................... 5-4
6. Communication format (D8120) .............................................................. 6-1
6.1 What Is Communication Format? ..........................................................................6-1
6.2 Related Flags and Data Registers.........................................................................6-1
6.2.1 Special Auxiliary Relays ........................................................................................................... 6-1
6.2.2 Special Data Registers ............................................................................................................ 6-1
6.3 Communication Format (D8120) ..........................................................................6-2
6.4 Example of setting program...................................................................................6-3
7. Computer Link......................................................................................... 7-1
7.1 Data Flow by Link ..................................................................................................7-1
7.2 Information Needed Before Programming .............................................................7-3
7.2.1 Programmable Controller Operation ......................................................................................... 7-3
7.2.2 Computer Notes........................................................................................................................ 7-3
7.3 How to Read a Control Protocol Diagram..............................................................7-4
7.4 Basic Formats of Dedicated Protocol ....................................................................7-5
7.4.1 Control Protocol Format 1 ........................................................................................................ 7-6
7.4.2 Control Protocol Format 4......................................................................................................... 7-7
7.4.3 Control Protocol Parts Explained .............................................................................................. 7-8
7.4.4 Time-out Check Time.............................................................................................................. 7-11
7.5 Communication Timing Chart ..............................................................................7-12
7.5.1 Reading Data from Programmable controller ......................................................................... 7-12
7.5.2 Writing Data to Programmable Controller ............................................................................... 7-12
7.5.3 Communication Time .............................................................................................................. 7-13
7.6 Character Area Data Transmission .....................................................................7-14
7.6.1 Bit Device Memory.................................................................................................................. 7-14
7.6.2 Word Device Memory ............................................................................................................. 7-15
7.7 Commands and Device Ranges ..........................................................................7-16
7.7.1 Commands.............................................................................................................................. 7-16
7.7.2 Device specification ranges .................................................................................................... 7-17
7.8 Example Computer Program for Loopback Test .................................................7-18
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