Omron CQM1H - PROGRAM Programming Manual page 299

Programmable controllers; inner boards

Table of Contents

Data Movement Instructions

Stack Operation

When bits 12 to 15 of C=9, DIST(80) can be used for a stack operation. The

other 3 digits of C specify the number of words in the stack (000 to 999). The

content of DBs is the stack pointer.

When the execution condition is OFF, DIST(80) is not executed. When the

execution condition is ON, DIST(80) copies the content of S to DBs+1+the

content of DBs. In other words, 1 and the content of DBs are added to DBs to

determine the destination word. The content of DBs is then incremented by 1.

1. DIST(80) will be executed every cycle unless the differentiated form

(@DIST(80)) is used or DIST(80) is used with DIFU(13) or DIFD(14).

2. Be sure to initialize the stack pointer before using DIST(80) as a stack op-

The following example shows how to use DIST(80) to create a stack between

DM 0001 and DM 0005. DM 0000 acts as the stack pointer.

First execution

Stack pointer

The offset or stack length in the control word is not BCD.

Indirectly addressed EM/DM word is non-existent.

(Content of *EM/*DM word is not BCD, or the EM/DM area boundary

has been exceeded.)

During stack operation, the value of the stack pointer+1 exceeds the

length of the stack.

Section 5-18

Address Instruction

Address Instruction

Stack pointer

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