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176
Index Registers
Section 4-15
4.
Steps 2 and 3 are processed repeatedly until the conditions are met.
Note
Adding, subtracting incrementing, or decrementing for the Index
Register is performed using one of the following methods.
• Each Type of Indirect Addressing for Index Registers:
Auto-increment (,IR
+ or ,IR
++), auto-decrement (,-IR
or ,--IR
),
constant offset (constant ,IR
), and DR offset (DR
,IR
) for Index
Registers
• Instructions for Direct Addressing of Index Registers:
DOUBLE SIGNED BINARY ADD WITHOUT CARRY (+L), DOUBLE
SIGNED BINARY SUBTRACT WITHOUT CARRY (-L), DOUBLE IN-
CREMENT BINARY (++L), DOUBLE DECREMENT BINARY (--L)
Example:
If, for example, instruction A above is a comparison instruction, table data
could be read from start to the end of the table to compare all of the data with
a specific value. In this way, blocks of user-defined processing can be freely
created depending by applying Index Registers.
■
Example Using Index Registers
In the following example, TIM instructions for timer numbers 0 to 99 use set
values in D100 to D109. This can be achieved by using one TIM instruction,
using an index register for the timer number, using another index register for
the Completion Flags, and repeatedly executing the TIM instruction to start
the timers.
Instruction A
Instruction A m+1
Instruction A m+n
MOVR m IR0
The PLC memory address
of address m is stored in IR0.
Repeated execution,
e.g., loop for
FOR or NEXT.
Instruction A ,IR0+
The PLC memory addresses for each T0's PV, Completion
Flag, and W0.00 are set in Index Registers IR0, IR1, and IR2 using a
MOVRW or MOVR instruction.
- The TIM instruction is executed for the timer number
(timer PV) that IR0+ indirectly addresses.
- The Timer Completion Flag that is indirectly addressed for
IR1+ turns ON when the time elapses. When the ON status
is received, bits in the work area that are indirectly
addressed for IR2+ are turned ON.
- The contents of IR0+, IR1+, and IR2+ are automatically
incremented by one after accessing the values using indirect
addressing.
- D0 is incremented.
Repeated
Summary of Contents for Sysmac CP1H
Page 2: ......
Page 3: ...CP1H X40D CP1H XA40D CP1H Y20DT D CP1H CPU Unit Operation Manual Revised October 2014...
Page 4: ...iv...
Page 10: ...x...
Page 18: ...xviii...
Page 22: ...xxii...
Page 34: ...xxxiv Conformance to EC Directives 6...
Page 76: ...42 Function Blocks Section 1 5...
Page 176: ...142 CP series Expansion I O Unit Wiring Section 3 6...
Page 372: ...338 Analog I O XA CPU Units Section 5 5...
Page 578: ...544 Trouble Shooting Section 8 7...
Page 622: ...588 Sample Application Section 9 12 Network Settings Network Tab Network Settings Driver Tab...
Page 668: ...634 Standard Models Appendix A...
Page 744: ...710 Auxiliary Area Allocations by Address Appendix D...
Page 771: ...737 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Page 772: ...738 Connections to Serial Communications Option Boards Appendix F...
Page 800: ...766 Specifications for External Power Supply Expansion Appendix H...
Page 806: ...772 Index W Work Area 165 work bits 165 work words 165 write protection 379...
Page 808: ...774 Revision History...
Page 809: ......