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Operation of the Memory Link
Section 9-3
9-1 Operation of the Memory Link
This sectiondescribesthe function of the memory link. For outline ofthe function of
memory link, refer to 1-4 ”Communication by Using Memory Link”.
9-1-1 PT Memory
With memory link, allocation of element bit or word is performed for PT memory.
The PT memory is a virtual PC area within the NT31/NT31C. The NT31/NT31C
read/write to the internal PT memory and a host controls/monitors the
NT31/NT31C by reading/writing PT memory.
With PT memory, there is no classification of the area as there is with real PC
areas: it consists of a memory link area of just 10000 words from 0000 to 9999.
Memory link can be treated in exactly the same way as direct connections such as
host link and NT link, except that the channels to be allocated differ. Thespecifica-
tion of bits is also the same.
A diagram of the PT memory is shown below.
Bits
Words
0000
0001
0002
9997
9998
9999
15 14 1312 11 10 9 8 7 6 5 4 3 2 1 0
Reference:
S The PT memory is backed up by the battery even while the NT31/NT31C power
is OFF.
S The explanations in this section concentrate on the memory link communication
method. For details on control and notification between the NT31/NT31C dis-
play elements and the PT memory, refer to Section 7 “NT31/NT31C Functions”
and Section 8 “How to Use the PT”.
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