Mitsubishi QCPU (Q Mode), Руководство пользователя

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MELSEC-Q
10 DEVICES
(3) Output method
(a) There are 2 types of output: "refresh outputs" and "direct access outputs".
1) The refresh output gives out the ON/OFF data to an output module by
performing an output refresh before the sequence program is
executed. 1
Output refresh area
CPU module
Output module
ON/OFF data output
Y10
0
The refresh output is indicated as "Y " in the sequence program.
For example, a "10" output becomes "Y10".
2) The direct access output gives out the ON/OFF data to an output
module when the instruction is executed.
0
DY10
Output refresh area
CPU module Output module
ON/OFF data output
The direct access output is indicated as "DY " in the sequence
program.
For example, a "10" output becomes "DY10".
(b) Differences between refresh output and direct access output
The direct access output accesses an output module directly when an
instruction is executed, which realizes shorter external output time.
However, it processes an instruction slower compared with the refresh
output.
The direct access output is used only for outputting to the output
module or the intelligent function module/special function module
mounted on the base unit or extension base unit.
The refresh and direct output differences are shown in Table 10.3 below.
Table 10.3 Differences Between Refresh Outputs & Direct Access Outputs
Item Refresh Input Direct Access Outputs
Q02CPU 0.158 s
Main base unit : 8.0 s
Extension base unit : 8.8 s
Processing speed
(OUT Y/DY)
Q02HCPU,
Q06HCPU,
Q12HCPU,
Q25HCPU
0.068 s
Main base unit : 4.0 s
Extension base unit : 4.8 s
Output module installed at base/extension
base unit
Outputs of intelligent function module
installed at base/extension base unit
Outputs of I/O link module installed at
extension base unit
Usable Usable
Outputs used at MELSECNET/H network
system or CC-Link system
Usable Unusable
REMARK
1: See Section 4.7.1 for details on the refresh mode.