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CHAPTER9 DEVICES
9
9.2 Internal User Devices
(3) Memory size
Set the internal user devices so that the following condition is satisfied.
(Bit device size) + (Timer, retentive timer, and counter sizes) + (Word device size) 29K words
(a) Bit device
For bit devices, 16 points are calculated as one word.
(b) Timer (T), retentive timer (ST), and counter (C)
For the timer (T), retentive timer (ST), and counter (C), 16 points are calculated as 18 words
(c) Word device
For the data register (D), link register (W), and link special register (SW), 16 points are calculated as 16 words.
16
(X+Y+M+L+B+F+SB+V+S)
(Bit device size) =
Words
16
(Timer, retentive timer, or counter size) =
(T+ST+C)
18 Words
16
(D+W+SW)
(Word device size) = 16 Words
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