Table of Contents
Advertisement
3. SPEclFlcATloNs
/MELSEC
3.8 C o m m u n i c a t i o n b e t w e e n AD51 a n d P C CPU
Any
AD51 i n i t i a t e d r e q u e s t s
for c o m m u n i c a t i o n t r a n s a c t i o n s b e t -
w e e n t h e
AD51 a n d P C C P U a r e p r o c e s s e d o n c e w h e n t h e END,
FEND
or
COM i n s t r u c t i o n i s e x e c u t e d by t h e P C . T h e t i m e t a k e n to
p r o c e s s a s y s t e m s u b r o u t i n e a n d t h e d e l a y t i m e s c a u s e d by m u l t i p l e
a c c e s s i n g of t h e P C C P U a r e e x p l a i n e d in t h i s s e c t i o n .
(1)
T h e f o l l o w i n g t a b l e s h o w s t h e n u m b e r of s c a n s t a k e n by t h e
AD51
t o
p r o c e s s P C t r a n s a c t i o n s u b r o u t i n e s .
Device
memorv
Sequence
program
Paramete
CPU
(PC1
Buffer
memory
-
- -
Item
1
System
I
N@er
of Scans
Subroutme
Requared for Processing
Batch read
E l
SADR
1
Batch write
1
SAOW
1
2
scans for
1
scan
device "R"
Test
1
SADT
I
irandom write1
I
Bit
1
Independent of
scan
Monitor data
entry
1 scan for
device
"R"
only
Independent
of
scan
far other devices.
Monitor
1
4
S A O M l
I
1
scan
Read
1
SAAR
1
1 scan
Main
Write
SAAW
2
scans
Sub
1
scan
for T I C s e t value
Read
I
SAPR
I
2
scans
Write
SAPW
2 scam
Analysis
request
SAPS
2
scans
Remote run
SKR
Remote
stop
SKP
1
scan
PC
type
made
SPC
Batch read
SR2
Independent of rcan
Batch write
SW2
Advertisement
Table of Contents
