Filter
Top Products
16
The following example combines a C2000H PC, fourteen C500 PCs, and
fifteen C200H PCs in a Multilevel System with three Subsystems. Not all PCs
are shown below; missing Units are indicated by dotted lines. The PC Link
Unit farthest to the left in each Subsystem has been designated as the poll-
ing unit. The C500 PCs, providing the smallest LR area in their Subsystems,
limit the number of bits that can be transferred via the PC Link Units. The LR
word allocations for each PC Link Unit are given below it. The shaded area is
the section(s) of the LR area written to by the PC Link Unit(s).
In this example, data written to LR 03 by the PC with PC Link Unit 1 of the
leftmost Subsystem (level 0) is automatically transmitted to LR 03 in the
other PCs of that Subsystem. To make the data available to the middle Sub-
system (level 1), it is necessary for the transfer PC to transfer the data from
LR 03 to LR 32 or LR 33 (the level 1 write words for that PC). To do this, the
PC must be programmed with MOV LR 03 to LR 32 or LR 33. The data is
then automatically transmitted to LR 16 or LR 17 in the other PCs of the mid-
dle Subsystem. To make the data available to the rightmost Subsystem (level
0), it is necessary for the transfer PC to transfer the data from LR 16 or LR
17 to LR 00 or LR 01. Again, the MOV instruction is utilized.
Because this is a Multilevel System, only half of the available LR words may
be used by each Subsystem: the first half by the level 0 Subsystems, the
second half by the level 1 Subsystem. The unused LR words in each PC may
be used as work bits in programming.
C2000H PC
Unit 0,
level 0
C200H PC
Unit 1,
level 0
C200H PC
Unit 15,
level 0
Unit 0,
level 1
C500 PC
Unit 1,
level 1
C500 PC
Unit 7,
level 1
Unit 0,
level 0
C1000H PC
Unit 1,
level 0
C1000H PC
Unit 7,
level 0
The C200H could be replaced by the C200HS and C200HX/HG/HE(-Z) with-
out any changes in this example.
System with Three
Subsystems
Note
LR Area Allocations Section 3-2