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24 Series 90 -70 I/O Link Interface Module User’s Manual – February 1993
GFK-0644A
Selecting a Program Block
There are three Program Blocks on a diskette. Select the Program Block that provides
the level of functionality and performance required for the application.
Program Block
Identifier
Number of I/O
Link Modules
Maximum Number
of References
Compatible CPUs
LINK73X 1 512 points 731/732, 771/772, 781/782
LINK77X 2 2048 points 771/772, 781/782
LINK78X 4 4096 points 781/782
The LINK73X Program Block provides the fastest update speed and has the lowest
memory requirements, but is limited to a single I/O Link Interface Module per 90–70
system and 512 I/O points. LINK77X provides up to two I/O Link Interface Modules per
90–70 PLC and 2048 I/O points, but it is slightly slower and requires more memory.
LINK78X accommodates up to four I/O Link Interface Modules per PLC and provides
up to 4096 I/O points. Its update rate is slower than the other two Program Blocks, and
it uses more memory.
For the 731/732 CPU, the LINK73X Program Block is required. For the 771/772 CPU,
either LINK73X or LINK77X can be used. For the 781/782 CPU, any of the three
Program Blocks can be used. Remember that the smaller Program Blocks will give better
performance.
Adding the Program Block Logic to an Application Program
To add a Program Block to an application program, follow these steps:
1. Copy the selected Program Block library file from the diskette to the Logicmaster
90–70 library directory (such as: c:\lm90\p70\p70_lib).
2. Using the Librarian function (available with Logicmaster 90–70 version 3.0 or later),
import the Program Block into the working folder.
3. If the application program will use nicknames for the Program Block %P references
(see page 27), include the nicknames in the Variable Declaration Table. The
nicknames are provided as three .SDE files in the program folder on the application
software diskette: LINK73SX.SDE, LINK77SX.SDE, and LINK78SX.SDE. To include
the appropriate file, go to the Variable Declarations in the working folder, select
“include”, and enter the path and filename (such as: c:\link\link73sx.sde).
4. Complete the application program logic as described on the following pages.