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1
OVERVIEW
1.1 Features
1 - 4
1
OVERVIEW
2
SYSTEM
CONFIGURATION
3
SPECIFICATIONS
4
FUNCTIONS
5
PREPARATORY
PROCEDURES BEFORE
OPERATION
6
LINK DATA SEND/
RECEIVE PROCESSING
AND PROCESSING TIME
7
PROGRAMMING
8
TROUBLESHOOTING
(2) Transient transmission function
(a) Communication from a master station to a local station
By executing the LRDP/LWTP instruction in the sequence program of the master
station, data can be read from or written to local station devices (T, C, D, W).
(b) LRDP/LWTP instruction receive processing
A Q series local station and an A/QnA series local station are different in
processing at the time of accepting the LRDP/LWTP instruction.
1) Q series local station
The receive processing is performed to the LRDP/LWTP instruction in a
sequence program.
CHAPTER 7 PROGRAMMING
2) A/QnA series local station
The receive processing is performed to the LRDP/LWTP instruction in the
system.
(The program for receiving LRDP/LWTP instruction is not required.)
Figure 1.6 LWTP instruction receive processing (Q series local station)
Figure 1.7 LWTP instruction receive processing (A/QnA series local station)
Q series local station
Local module
CPU module
Link data
storage area
Buffer memory
Buffer memory
Data memory
storage area
DCH
DMOV Z0
BMOV D0Z1 Z2
Write data
Master station
Data memory
storage area
D20 to D29
Command
LWTP
Device
write
D200 to D209
= K4
MOV Z2
= H4420 Z0
U0\
G174
U0\
G220
U0\
G216
U0\
G219
"A part" of the program for receiving LWTP instruction
A/QnA series local station
Link module
CPU module
Data memory
storage area
Master station
Data memory
storage area
D20 to D29
Command
LWTP
Device
write
D200 to D209