8. PROGRAMMING
MELSEC-A
8-3
8.2.2
Extend service mode (MODE switch : No. E)
*1: Exchange start request for user
Communication
READY
X1B
Module
READY
X1D
Exchange
Start End
Exchange
start
request
Initial output data write
Exchange start
Exchange
start end
Watchdog
timer error
Communication
READY
X1B
Module
Data read
Processing program using received data
Transmission data ON/OFF program
Data write
Communication
trouble detection
Trouble detection
signal reset
request
RST "Trouble detection signal reset request"
X00
Y00
FROMP
H0
K2128
D0
K1
X00
Exchange
start end
X00
X0D
READY
X1D
Communication
READY
X1B
Module
X0D
READY
X1D
FROM
H0
K0Z0
K4X100
K5
X100
X14F
Y100
Y14F
TO
H0
K0Z1
K4Y100
K5
FROMP
H0
K2040
D1000
K5
X01
X01
Y01
Watchdog
timer error
*1
MOV
D0
Z0
FROMP
H0
K2188
D1
K1
TOP
H0
K0Z1
K4Y100
K5
MOV
D1
Z1
……………………
Trouble information read
Communication trouble
detection signal reset
Y100
Input start address offset
for 1st station
Output start address offset
for 1st station
Initial output data write
Exchange start
Point
(1)
Pay attention to the increase of the scan time since it will take at least 3.3ms to process the
FROM/TO instruction.
It is recommended to perform the FROM/TO instruction for the AJ71PB92D/A1SJ71PB92D
only once in each sequence scan.
(2)
If the network configuration allows the power supplies to the A1SJ71PB92D and to the slave
station to be on simultaneously, there may be cases in which the slave side is not
completely started at the time the X1B turns on. In this case, consider the time lag for the
slave station to completely start up when estimating the time period from the point the X1B
turns on until the communication start "Y00" turns on.