Toshiba T2N User Manual download pdf (Page 198)

3.User Data

User's manual 185

The following shows an example of the operation when index

modification is applied to a program.

Example)

The following processing is carried out when X0010 changes from OFF

to ON

Substitute 3 times the value of the content of C000 in index register I

Store content of XW005 in D(3000 + I)

Add 1 to the content of I and store content of XW010 in D(3000 + I)

Add a further 1 to the content of I and store content of XW012 in

D(3000 + I)

Incidentally,

—P — is a positive pulse contact which becomes ON once only when

device A starts-up from OFF to ON (up to the instruction execution of

the following scan)

—[ A ✳ B → C + 1• C ]—is multiplication instruction which multiplies

A by B and stores it in double-length register C + 1• C

—[ +1 A ]— is an increment instruction which adds 1 to the content of

A and stores it in A

—[ A MOV B ]— is a data transfer instruction which substitutes the

content of A in B .

1. Substitutions of values to index registers and index modification may

be carried out any number of times during a program. Therefore,

normally, the program will be easier to see if a value substitution to

an index register is executed immediately before index modification.

2. Be careful that the registers do not exceed the address range

through index modification. When the results of index modification

exceed the address range, the instruction becomes non-

executable, and special relays (S0051 and S0064) which indicate

‘boundary error’ become ON.

NOTE

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Toshiba T2N User Manual Page 198