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Index Registers Section 4-11
Since some operands are treated as word data and others are treated as bit
data, the meaning of the data in an Index Register will differ depending on the
operand in which it is used.
1,2,3...
1. Word Operand:
MOVR(560) 0000 IR2
MOV(021) D0 , IR2
When the operand is treated as a word, the contents of the Index Register
are used “as is” as the PLC memory address of a word.
In this example MOVR(560) sets the PLC memory address of CIO 2 in IR2
and the MOV(021) instruction copies the contents of D0 to CIO 2.
2. Bit Operand:
MOVR(560) 000013 ,IR2
SET +5 , IR2
When the operand is treated as a bit, the leftmost 7 digits of the Index Reg-
ister specify the word address and the rightmost digit specifies the bit num-
ber. In this example, MOVR(560) sets the PLC memory address of CIO 13
(0C00D hex) in IR2. The SET instruction adds +5 from bit 13 (D hex) to this
PLC memory address, so it turns ON bit CIO 1.02.
Index Register
Initialization
The Index Registers will be cleared in the following cases:
1. When the operating mode is changed from PROGRAM to RUN or MONI-
TOR mode or vice-versa
2. When the power is cycled
Setting Index Registers Always set the required value in an index register before using it. The contents
of an index register will be unpredictable if it is not set in advance.
The contents of an index register is also unpredictable after an interrupt task
is started. When using index registers inside an interrupt task, use
MOVR(560) (for anything but timer/counter PVs) or MOVRW(561) (for
timer/counter PVs) to set the required value.
Direct Addressing When an Index Register is used as an operand without a “,” prefix, the instruc-
tion will operate on the contents of the Index Register itself (a two-word or
“double” value). Index Registers can be directly addressed only in the instruc-
tions shown in the following table. Use these instructions to operate on the
Index Registers as pointers.
The Index Registers cannot be directly addressed in any other instructions,
although they can usually be used for indirect addressing.
Instruction group Instruction name Mnemonic
Data Movement
Instructions
MOVE TO REGISTER MOVR(560)
MOVE TIMER/COUNTER PV TO REG-
ISTER
MOVRW(561)
DOUBLE MOVE MOVL(498)
DOUBLE DATA EXCHANGE XCGL(562)
Table Data Processing
Instructions
SET RECORD LOCATION SETR(635)
GET RECORD NUMBER GETR(636)
Increment/Decrement
Instructions
DOUBLE INCREMENT BINARY ++L(591)
DOUBLE DECREMENT BINARY – –L(593)
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