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be used as the operand in the instruction, and the content of DM 0324 will be
moved to LR 00.
MOV(21)
DM 0100
LR 00
Word Content
DM 0099 4C59
DM 0100 0324
DM 0101 F35A
DM 0324 5555
DM 0325 2506
DM 0326 D541
5555 moved
to LR 00.
Indicates
DM 0324
Indirect
address
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 ALLOCATION operation in the Programming Console or
SSS. 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 ALLOCATION operation is
shown below. Refer to 4-6-3 Clearing Memory 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).
DM (Data Memory) Area Section 3-6