APPENDIX MELSEC-A
A-4
Appendix 2 Dissimilarities Between A1SJ71PB96F New Products
(Software Version C or Later) and Conventional Products
(Software Version B or Before)
2.1
Dissimilarities Between A1SJ71PB96F New Products (Software
Version C or Later) and Conventional Products (Software Version B or
Before)
(1) The size of data that can be handled per single communication has been changed.
New product
Conventional product
232 bytes (1856 bits)
128 bytes (1024 bits)
The following three services are affected by the change in data size.
Specifications for the other services remain unchanged.
O: Supports new data size
: Spec not changed
Function
Service
Client (requestor)
Server (receiver)
Read O
Write
O
Information Report
O *1
*1 Supports new data size only when receiving send information from the client (requestor).
The Boolean data service to be able to do the handling in each service is as follows.
a) Read service
As only data is contained in the response frame of the Read command, the size that can
be handled is constant regardless of the access mode.
Access mode
Sub-index
Index
Unsigned 16 Bit
Variable-Name
1 to 32 Oct.
None
232 bytes
232 bytes
Provided
232 bytes
232 bytes
b) Write service
In the AJ71PB96F/A1SJ71PB96F, if variables are designated , the variable name is
handled as 32 fixed characters. Thus, the size that can be handled is constant
regardless of the variable size.
Access mode
Sub-index
Index
Unsigned 16 Bit
Variable-Name
1 to 32 Oct.
None
232 bytes
202 bytes
Provided
231 bytes
200 bytes
c) Information Report (Receive) service
In the AJ71PB96F/A1SJ71PB96F, if variables are designated, the variable name is
handled as 32fixed characters. Thus, the size that can be handled is constant regardless
of the variable size.
Access mode
Sub-index
Index
Unsigned 16 Bit
Variable-Name
1 to 32 Oct.
None
232 bytes
202 bytes
Provided
231 bytes
200 bytes
