56
3-6-1 Expansion DM Area
The
expansion DM area is designed to provide memory space for storing oper
-
ating
parameters and other operating data for Link Units and
Special I/O Units.
Up to 3,000 words of UM can be allocated as Expansion DM
(in 1K-word incre
-
ments)
using the UM ALLOCA
TION operation
in the Programming Console or
LSS. Expansion DM area addresses run from DM 7000 to DM 9999.
The data in the expansion DM area can be transferred to the Special I/O Unit
Default
Area (DM 1000 to DM 1999) when starting the PC or via programming
instruction
to easily change operating parameters, enabling rapid switching be
-
tween
control processes. The expansion DM area can also be used to store pa
-
rameters for other devices connected in the PC system, e.g., Programmable
Terminal character string or numeral tables.
The expansion DM area is used to store operating parameters and cannot be
used
in programming like the normal DM area. Expansion DM can
only be over
-
written
from a Peripheral Device, retains status during power interruptions, and
cannot be used for indirect addressing.
The
UM area can be allocated as expansion DM area in increments of 1K words.
Once
expansion DM area has been created, it is saved
and transferred as part of
the program, i.e., no special procedures are required when saving or transfer-
ring the program.
UM ALLOCATION Operation The
procedure for the Programming Console’
s UM
ALLOCA
TION operation is
shown
below
. Refer to
1-8-10 New
Programming Console Operations
for details
on the DATA CLEAR and UM ALLOCATION instructions.
1, 2, 3... 1. Clear memory.
CLR
RESETSET
NOT
EXT MONTR
Note UM allocation is not possible unless memory is cleared first.
2. The
expansion DM area can be set to 0, 1, 2, or 3 K words. The following key
sequence creates a 2-KW expansion DM area (DM 7000 to DM 8999).
WRITECLR FUN VER CHG 2 SET 9 7 1 3
Press the 0 Key to eliminate the expansion DM area (0 KW).
or Press the 1 Key to allocate DM 7000 to DM 7999 (1 KW).
or Press the 2 Key to allocate DM 7000 to DM 8999 (2 KW).
or Press the 3 Key to allocate DM 7000 to DM 9999 (3 KW).
3-6-2 Special I/O Unit Data
Special
I/O Units are allocated 1000 words in the DM Area as shown in the fol
-
lowing
table. The value set in the PC Setup (DM 6602 bits 08 to 15) determines
DM Area Section 3-6
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