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1.4 Devices and Instructions Useful for Programming
The CPU module is provided with devices and instructions useful for programming.
This section describes the outline of these devices and instructions.
(1) Various ways of device specification
(a) Using each bit of a word device as a contact or coil
By specifying a bit of a word device, the bit can be used as a contact or coil.
X0
D0.5
(b) Easy direct processing in units of one point
Use of the direct access input (DX
of one point) in the program. (
(c) No input pulse conversion required by using a differential contact
Pulse conversion processing for inputs is no longer required with the use of a differential contacts (
).
X0
X1
Y100
1 - 6
SET
D0.5
SET
Y10
Figure 1.8 Specifying a bit of a word device
) and direct access output (DY
Section 3.8.2)
Direct access input
M0 DX10
Figure 1.9 Direct processing in units of one point
Differential contact
Y100
On at the rising
edge of X0
Figure 1.10 Use of a differential contact
A bit-specified word device (turns on
(switches to 1) the 5th bit (b5) of D0.)
A bit-specified word device (turns on/off depending
on the on/off (1/0) status of the 5th bit (b5) of D0.)
) enables easy direct processing (in units
DY100
On/off data is output to the
output module when the
instruction is executed.
On/off data is input from
the input module when the
instruction is executed.
X0
M0
X1
Y100
and
PLS
M0
Y100
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