561
Operation of the Memory Link
Section 9-3
9-1
Operation of the Memory Link
This section describes the function of the memory link. For outline of the 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. The specifica-
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 13 12 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”.
Summary of Contents for NT31 Series
Page 1: ...Cat No V043 E1 2 Programmable Terminal NT31 31C OPERATION MANUAL...
Page 2: ...iii NT31 31C Programmable Terminal Operation Manual Produced March 1999...
Page 41: ...30 Before Operating Section 1 5...
Page 75: ...64 Using a Memory Unit NT31 NT31C without V1 Section 3 6...
Page 160: ...149...
Page 174: ...163...
Page 193: ...182...
Page 211: ...200...
Page 235: ...224 c Return to the screen on which screens are specified...
Page 262: ...251...
Page 360: ...349 It is not possible to control a gloval window by touch switch operation...
Page 468: ...457 254 255 0 2 7 1 4 5 3 3 0 0 0 5 9 8 0 3...
Page 476: ...465 Special Functions Section 7 16...
Page 495: ...484 OFF...
Page 610: ...599 Commands Responses Section 9 3...
Page 630: ...619 Examples of Actual Applications of Memory Link Section 10 2...