Mitsubishi QD51-R24 Programming Manual

A - 5 A - 5
4 THE EXCHANGE BETWEEN THE PLC AND BUFFER MEMORY 4-- 1 to 4- 21
4.1 PLC Numeric Data and BASIC Numeric Data....................................................................................... 4- 1
4.2 The Exchange with the PLC ...................................................................................................................4- 2
4.2.1 Control tables ...................................................................................................................................4- 2
4.2.2 PLC station number .........................................................................................................................4- 3
4.2.3 Choosing a process .........................................................................................................................4-12
4.2.4 Bit/Word designation........................................................................................................................4-12
4.2.5 Device number designation .............................................................................................................4-13
4.2.6 Storage area for reading and writing data.......................................................................................4-15
4.3 Communication with the Buffer Memory ................................................................................................4-20
5 COMMUNICATION USING GENERAL-PURPOSE INPUT/OUTPUT 5- 1 to 5- 7
5.1 Communications Module PLC CPU (About Input Device X)............................................................5- 1
5.2 PLC CPU
Communications Module (About Output Device Y).........................................................5- 4
6 I/O PROCESSING OF DATA FILES 6- 1 to 6- 13
6.1 File Numbers............................................................................................................................................6- 2
6.2 Sequential File I/O Procedures................................................................................................................6- 3
6.3 Random File I/O Procedures ...................................................................................................................6- 7
6.4 Caution on Handling Data Files............................................................................................................... 6 12
6.4.1 Handling data files during multitask processing...............................................................................6-12
6.4.2 Number of data files that can be handled by each program............................................................ 6-13
7 COMMUNICATION WITH EXTERNAL DEVICES 7- 1 to 7- 14
7.1 Correspondence between the Interface and Channel Number.............................................................7- 1
7.2 Preparation for the Communication........................................................................................................ 7- 2
7.2.1 Communication parameter setting...................................................................................................7- 2
7.2.2 Control table .....................................................................................................................................7- 4
7.3 Communication Procedure with External Devices.................................................................................7- 6
7.3.1 Communication with a console........................................................................................................7- 6
7.3.2 Communication with a terminal........................................................................................................7- 8
7.3.3 Communicating with a printer ..........................................................................................................7-10
7.3.4 Communication with other external devices....................................................................................7-12
7.4 Interrupt Processing from External Devices...........................................................................................7-14
8 MULTITASK PROCESSING 8- 1 to 8-19
8.1 Multitask Processing............................................................................................................................... 8- 1
8.2 How to Synchronize the Execution (Event Control)............................................................................... 8- 5
8.3 To Use Devices (Resources) in Multitasking (Mutual Exclusive Control of Resources)......................8- 8
8.4 Start Another Program from within a Program....................................................................................... 8-13
8.5 Exchanging Data between Tasks...........................................................................................................8-14
8.5.1 Common memory and internal devices.......................................................................................... 8-14
8.5.2 Message ports................................................................................................................................. 8-16

Mitsubishi QD51-R24 Specifications

General

Brand	Mitsubishi
Model	QD51-R24
Category	Controller
Language	English