Mitsubishi MELSEC-A Series Reference Manual page 60

4. COMPOSITION OF A THREE-TIER SYSTEM
(2) Restriction on use of link modules
(a) For the CPU module other than the AnUCPU, A2ASCPU(S1), A2USHCPU-S1,
QnACPU, and Q2AS(H)CPU(S1)
Only one of the following link modules can be used with a CPU module.
When configuring the three-tier system, use a CPU module having a link function
with any of the following link modules.
AJ71AP21
AJ71AP21-S3
A1SJ71AP21
AJ71AR21
A1SJ71AR21
AJ71AT21B
A1SJ71AT21B
(b) For the CPU module any of the AnUCPU, A2ASCPU(S1), A2USHCPU-S1,
QnACPU, and Q2AS(H)CPU(S1)
Up to two of the following link modules (one as a master station and the other as
a local station) can be used with a CPU module.
(The two modules cannot be used only for master stations or local stations.)
[For local station]
AJ71AP21
AJ71AP21-S3
A1SJ71AP21
AJ71AR21
A1SJ71AR21
[For master station]
AJ71AT21B
A1SJ71AT21B
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