Mitsubishi MELSEC-A Series Reference Manual page 77

4. COMPOSITION OF A THREE-TIER SYSTEM
4.4.3 System devices
Module Model
A1SJHCPU
A1SHCPU A1SJ71T21B
A2SHCPU
A1NCPU
A2NCPU
AJ71AT21B
A2NCPU-S1
A3NCPU
A2ASCPU
A2ASCPU-S1
A2USHCPU-S1
A1SJ71AT21
Q2ASCPU
B
Q2ASCPU-S1
Q2ASHCPU
Q2ASHCPU-S1
A2ACPU
CPU
A2ACPU-S1
module
A3ACPU
A2UCPU
A2UCPU-S1
A3UCPU AJ71AT21B
A4UCPU
Q2ACPU
Q2ACPU-S1
Q3ACPU
Q4ACPU
Q02CPU
Q02HCPU
Q06HCPU
A1SJ71AT23
Q12HCPU
BQ
Q25HCPU
A1SJ71T25B
Data link
module
AJ72T25B
Table 4.4 Link modules available for the three-tier system
Second tier
MELSEC
MELSECNET
mode
M L R
REMARK
(1) The definitions of L/m station,
follows.
a) L/m station ....... Local station in the second tier/master station in the
b) station ......... Local station in the third tier
c) r station ...........
Applicable system
MELSECNET/B data link
MELSECNET
MELSECNET
composite
NET
mode
mode mode
M L M L R L/m
third tier
Remote I/O station in the third tier
4 - 29
Third tier
MELSEC
MELSECNET
NET composite
mode mode
r L/m L/m
station, and r station in Table 4.4 are as
: Available
Remarks
r
• Use the station
number setting
switch to set the
selection of
master or local
station.
• Installed in an I/O
slot in a base
unit.
• Used only for
local stations.
• Installed in an I/O
slot in an
extension base
unit.