Index Registers; What Are Index Registers - Omron CS1G/H-CPUxx-EV1 Programming Manual

Index Registers

Auxiliary Area Flags and Words
6-2 Index Registers
6-2-1

What Are Index Registers?

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2. Select Properties. The following dialog box will be displayed.
3. Leave the checkmark for using IR/DR independently per task if separate
index and data registers are required for each task. Remove the check-
mark to use shared index and data registers for all tasks.
Name Address
IR/DR Opera- A09914
tion between
Tasks
Index Registers function as pointers to specify PLC memory addresses,
which are absolute memory addresses in I/O memory. After storing a PLC
memory address in an Index Register with MOVR(560) or MOVRW(561),
input the Index Register as an operand in other instructions to indirectly
address the stored PLC memory address.
The advantage of Index Registers is that they can specify any bit or word in I/
O memory, including timer and counter PVs.
Description
Indicates whether or not index and data registers are
shared between tasks.
0: Separate registers for each task (default)
1: Shared registers for all tasks
Section 6-2