Multi-Programming Function; Program Registration Numbers; Program Execution Order; Precautions - Mitsubishi Electric MELDAS C6 Programming Manual

2.2 Multi-Programming Function

Multiple PLC programs can be registered in C64 and executed in order.
Using this function, PLC program can also be developed by each process.

2.2.1 Program Registration Numbers

Max. registration numbers of PLC program are 9.
One program can contain programs for main and for high-speed together.

2.2.2 Program Execution Order

Multiple programs are executed in determined order, and not executed simultaneously.
The order is determined depending on the label No. in the head of program as following table,
regardless of the registered order. If the same label No. has been used repeatedly, the program
registered later will be valid, and the program made invalid will be not executed.
Label No.
P251
P360 to P368
P252
P370 to P378
Each program ends by FEND command.

2.2.3 Precautions

(1) The label No. is common in all registered programs. Therefore, if the label No. is used repeatedly,
the program registered later will be given priority.
(2) All devices used in the program are common. There is no local device. When one program end,
the next program will take over each device state as it is.

2.3 User Memory Area Configuration

The user memory area approximate configuration and size are shown below.
User PLC
code area
Max. 256Kbyte
P251
P252
2. PLC Processing Program
2.2 Multi-Programming Function
Program
High-speed processing 1st
High-speed processing 2nd to 10th
Main processing
Main processing
C on tr ol i nfo rm ati on
Message data
・
Contact coil
comment data
High speed processing
Main Processing
- 54 -
Get other manuals https://www.bkmanuals.com
Execution order
(The smaller the number is, the higher the order is.)
1st
2nd to 10th
(The smaller the number is, the higher the order is.)
Internal information table of User PLC
(The table is automatically generated.)
Data excepting the ladder program
・Alarm messages
・Operator messages
・PLC switches
・Load meter
・Contact・coil comment data, etc.
(Each of them can be stored in two languages.)
The area obtained by subtracting "Control information"
and "Program with the ladder language" from the User
PLC memory area can be used.
Program with the ladder language
Programs excepting the main processing are
not necessary.
The program order of high-speed and main processing
is random.
Max. 32000 steps (1step=4byte)