Mitsubishi MELSEC-A series Programming Manual

3. INSTRUCTION STRUCTURE
3 − 12
MELSEC-A
3.6 Subset Processing
Subset processing is used to increase processing speed provided with the following
conditions when bit devices are specified in basic or application instructions.
Instruction symbols are same as those of normal processings.
CPU Type Index Qualification Bit Device Word Device
An
AnN
A3V, A2C, A52G
A0J2H, AnS, AnSH,
A1FX
A73, A3N board
• Must not be used.
• Digit specification
must be K4(16-bit
processing)orK8
(32-bit processing).
• The bit device
specified must be a
multiple of 8.
• No condition
provided.
A3H, A3M • Must not be used.
• Digit specification
must be K4(16-bit
processing) orK8
(32-bit processing).
• The bit device
specified must be a
multiple of 16.
• File register (R) must
not be used.
AnA, A2AS, AnU
• Must not be used to
bit devices.
• Digit specification
must be K4(16-bit
processing) or K8
(32-bit processing).
• The bit device
specified must be a
multiple of 16.
• File register (R) and
index registers
(Z and V) must not
be used.
3.7 Operation Error
(1) In the following cases, the basic instruction and application instruction result in
operation error.
(a) Error described in the explanation of each instruction has occurred.
(b) When the result of index qualification includes error.(See Section 3.5 (5).)
POINT
If the specified range of a device has exceeded the allowable device range,
data will be written to devices other than the specified one without causing an
operation error. Therefore, caution shuld be exercised.
Z and V are
excluded when
index qualification
is performed to
word devices.
Table 3.4 Conditions for Subset Processing
Although B3F8 to 407 have been
specified, B400 to 407 do not exist.
Although W3FF and 400 have been
specified, W400 does not exist
actually.
X010
MOV DO B3F8
K4
X010
DMOV DO W3FF

Mitsubishi MELSEC-A series Specifications

General

Brand	Mitsubishi
Model	MELSEC-A series
Category	Controller
Language	English