4. FUNCTIONS
MELSEC-A
4-11
(b)
Extended service mode (MODE switch : No. E)
This is the area that stores the input data from the slave station.
In this area, the data length (in byte units) for each station is assigned in variable length
according to the parameter file set in the configurator software package.
The data length can be set in the range of 0 to 244 bytes.
Number of stations that can be set will vary in the range of 1 to 60, depending on the
specified data length. For example, seven stations can be set if the data length for each
station is 244 bytes, and 60 stations if the data length is 32 bytes.
Example : When the input data length for the first station is set to 23 bytes and that for the
second station to 7 bytes
Address
Address
0/0h
11/Bh
12/Ch
1st station input data
2nd station input data
n th station input data
60th station input data
1st station 2nd byte
1st station 4th byte
1st station 1st byte
1st station 3rd byte
1st station 22nd byte
1st station 21st byte
1st station 23rd byte
0/0h
10/Ah
11/Bh
2nd station 2nd byte
2nd station 4th byte
2nd station 1st byte
2nd station 3rd byte
12/Ch
13/Dh
2nd station 6th byte
2nd station 5th byte
2nd station 7th byte
14/Eh
15/Fh
1/1h
15/Fh
b15
b0
*2
b15
b0
(Upper byte)
(Lower byte)
: Free area (00h)
*2: When the data lenghth is set to an odd number
of bytes, the last upper byte becomes a free area
and data for the next station is assugned from
the next address.
Point
The input data of the slave station, which was disabled from communication during normal
communication and whose corresponding bit of the communication status area*1 turned ON (1),
is not stored into the input area of the AJ71PB92D/A1SJ71PB92D.
In the input area of the corresponding slave station, the data before communication failure is
held.
*1: Indicates the area of buffer memory addresses 2113 (841
H
) to 2116 (844
H
) in the slave status
area.