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8.
COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
8.8.3 Precautions during extension file register readlwrite
(1) The extension file register is not used by A1 and A1 NCPU.
This function is not available during communications between A1 or
AINCPU and the PC CPU.
(2) Some types of memory cassette loaded t o the PC CPU are unable to
detect an error (character area error 06H) if an attempt is made t o read
or write after specifying a block number which does not exist. In this
case, data which is read may not be correct and writing such incorrect
data may destroy the PC CPU user memory.
Always check the type of memory cassette and the parameter settings
before using this function.
I
A3NMCA-18
I
-
I
No.
10 to
No. 28
I
Type of
--
A3NMCA-12
The UTLP-FN1 Operating Manual or the A2A(Sl)/A3ACPU User's Manual
give details.
Block Numbers
Which
do
not Cause a Characler Area
Error
(06H)
A3NMCA-24
AOJZH, A2, A3CPU
A3NMCA40
-
No.
21 to
No.
28
I
-
No.
10.
No.
11
AZNCPU, A3NCPU
A3H, A2A ( S l )
ASACPU
No.
13 to
No.
20
No.
13 to No.
28
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