Omron V022-E3-1 operation manual Appendix

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Appendix I

Number of words for screen element registration

The number of words used for screen element registration is as follows.

Allocated words: Number of words

Allocated bits : Number of words calculated by summing the number of bits in

each area and taking 1 word to be 16 bits.

[Example]

Character string memory tables : 3 of 12 allocated words each

Numeral memory tables	: 4 of 2 allocated words each
Allocated bits for control	: 19 I/O relays, 7 link relays (contiguous bits)

The number of words assigned to character string memory tables and numeral memory tables is as follows:

12 words X 3 + 2 words X 4 = 44 words

The assignment for bits is as follows:

19 I/O relays ￿16 = 1 word with a remainder of 3 bits 2 words 7 link relays ￿16 = 0 words with a remainder of 7 bits ￿1 word

The total is therefore 44 words + 2 words + 1 word = 47 words

Elements occupying up to approximately 120 words, calculated in this way, can be registered. If the number of elements is larger than this, internal processing is in- creased in proportion to the excess number and this generates a delay in proces- sing.

If the point where the registrable quantity is exceeded is in the middle of an ele- ment that spans several words (for example a character string memory table), reg- istration￿ is quit without registering that element.

Order of priority for registration

Elements are registered in the following order of priority according to their type.

(1)Allocated words of the PT status control area

(2)Allocated bits for control (lamps, touch switches)

(3)Allocated words of numeral memory tables

(4)Allocated words of character string memory tables

If there is more than one element for each of (2) through (4), the elements are reg- istered in accordance with the following priority of word and bit areas:

(1)Data memory (DM)

(2)I/O relays (CH)

(3)Timers (TIM)

(4)Counters (CNT)

(5)Holding relays (HR)

(6)Auxiliary relays (AR)

Within each area, words and bits are allocated from the smallest number up.

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