4. FUNCTIONS
MELSEC-A
4-14
(4)
Example address information area, INPUT area, and OUTPUT area
The AJ71PB92D/A1SJ71PB92D reads the slave station address and I/O byte length set by the
parameter file which is set by the configurator and stores these in the buffer memory address
information area.
With the AJ71PB92D/A1SJ71PB92D, I/O areas are assigned to each slave station based on the
I/O byte length information in the address information area, and each I/O data will be stored in the
corresponding buffer memory area.
Example : At extended service mode
Address
Address information area
1920
1921
1922
1923
5
: Vacant area
CPU module
AJ71PB92D
A1SJ71PB92D
Slave
Slave
PROFIBUS-DP
network
Station address : 10
Input data length : 7 byte
Output data length : 5 byte
963/3C3h
Address
1st station 2nd input byte
INPUT/OUTPUT area
0/0h
1/1h
2/2h
959/3BFh
9600/3C0h
961/3C1h
1919/77Fh
IN
P
U
T
OU
T
P
U
T
1st station1st input byte
3/3h
4/4h
5/5h
6/6h
1st station 3rd input byte
2nd station 2nd input byte 2nd station 1st input byte
2nd station 4th input byte
2nd station 6th input byte
2nd station 3rd input byte
2nd station 5th input byte
2nd station 7th input byte
2nd station 2nd output byte 2nd station 1st output byte
2nd station 4th output byte 2nd station 3rd output byte
2nd station 5th output byte
b15
b0
b15
b0
*
1
0
*
3
3
*
2
10
5
7
962/3C2h
*4
Station address : 5
Input data length : 3 byte
Output data length : 0 byte
*1: Station address (FFFFh if not assigned)
*2: Input byte length (FFh if not assigned)
*3: Output byte length (FFh if not assigned)
*1, *2 and *3 are also set in a reserved station.
(The free areas in the INPUT area
are initialized with [00h].)
*4: Since output from the first station has a byte length of 0,
no area is allocated in the OUTPUT area.