• If the computer link module malfunctions but A (Large Type) Series spare parts are not available,
the AnS (Small Type) computer link module can be installed on the A1ADP adapter and used as a
replacement, allowing the system to recover quickly.
• If the A (Large Type) computer link module is not available when the system requires an
additional module, the AnS (Small Type) computer link module can be installed on the A1ADP
adapter and used as a spare part.
Solution and Benefit
The following is an example of replacing an A (Large Type) computer link module with AnS (Small Type)
computer link modules using the A-A1S module conversion adapter.
●
Instructions
(1) The A (Large Type) computer link modules have two channels (RS232C and RS422), whereas the AnS
Series computer link modules only have one. Therefore, if two channels are used, two modules are
needed.
(2) A program modification is not required if:
• The AnS module set to the No-protocol mode is mounted on the same slot as the existing module.
• The AnS module set to the Dedicated protocol mode is mounted on the empty slot.
(This is because the No-protocol mode requires a transmission program but the Dedicated protocol
mode does not.)
A35B
A35B
Channel set to
Dedicated protocol
mode
Channel set to
No-protocol
mode
A1SJ71UC24-R2
Model
A1SJ71UC24-R4
Outline
RS232C: 1 channel
RS422/485: 1 channel
A
1ADP-SP
A
1ADP-SP
A1SJ71UC24-R2 or
A1SJ71UC24-R4
set to No-protocol mode
(Mount this module on the same
slot as the existing module
(AJ71UC24))
2-channel
module
A-A1S
conversion
adapter
A-A1S
conversion
adapter
1-channel
module
1-channel
module
A1SJ71UC24-R2 or
A1SJ71UC24-R4
set to Dedicated protocol mode
(Mount this module on the empty slot)
Current configuration
After replacement
Module to be replaced
(1) System configuration example
Empty
AY41
AX41
AX41
AJ71UC24
A3ACPU
A61P
AY41
AX41
AX41
A1ADP-SP
+
A1SJ71UC24-R4
A1ADP-SP
+
A1SJ71UC24-R4
A3ACPU
A61P
Replace
(1) Computer link module options
6.1.2 Use AnS (Small Type) module as spare parts for A (Large Type) computer link module
• Replacement is simple because the A1SX42 (AnS (Small Type) module) has the same connector pin
arrangement as the AX42 (A (Large Type) module). Reconnect the external wire connectors after replacing
the modules.
• Some of the specifications (rated input current etc.) differ between the AX42 and the A1SX42.
Refer to "Transition from MELSEC-A/QnA Large Type Series to AnS/Q2AS Small Type Series Handbook"
L(NA)08064ENG for details.
Power supply module
Product name
CPU module
A-A1S module conversion adapter (for A1S)
Output module
Input module
Main base unit
Existing module
Replacement module
A61P
A3ACPU
N/A
A35B
-
-
1
AY41
Utilize existing module
Utilize existing module
A1ADP-XY
Utilize existing module
Utilize existing module
-
-
1
1
-
AX41
-
Utilize existing module
1
2
AX42
A1SX42
1
1
1
(2) Module selection example
Tip
124
6.1 Use AnS (Small Type) modules as spare parts for existing A (Large Type) Series modules
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