2-14
Section
Quick-response Inputs
153
2-14 Quick-response Inputs
2-14-1 CPM1/CPM1A Quick-response Inputs
The CPM1/CPM1A have quick response inputs that can be used to enable in-
putting shorter signals.
All 10-point CPU Units have 2 quick-response input terminals and the 20-, 30-,
and 40-point CPU Units have 4 quick-response input terminals. The same termi-
nals are used for quick-response inputs and interrupt inputs.
Quick-response Operation
Quick-response inputs have an internal buffer, so input signals shorter than one
cycle can be detected. Signals with a pulse width as short as 0.2 ms can be de-
tected, regardless of their timing during the PC cycle.
Overseeing
processes
Program
execution
I/O
refreshing
Overseeing
processes
Program
execution
I/O
refreshing
Input signal
(00003)
IR 00003
One cycle
CPU Unit
Input bits
Min. input pulse width
10-point CPU Units
IR 00003 to IR 00004
0.2 ms
20-, 30-, 40-point CPU Units
IR 00003 to IR 00006
The input bits in the above table can be set as quick-response inputs in
DM 6628, as shown in the following table.
Word
Settings
DM 6628
0: Normal input
DM 6628
0: Normal input
1: Interrupt input
2: Quick response input
2: Quick-response input
(D f
lt
tti
0)
(Default setting: 0)
15
0
DM 6628
Bit
Setting for input 00006: Set to 2
Setting for input 00005: Set to 2
Setting for input 00004: Set to 2
Setting for input 00003: Set to 2
Program Example
In this example, DM 6628 has been set to 0002.
25315 First Cycle Flag
ON for 1 cycle
@INT(89)
000
000
#000E
Mask/unmask input interrupts.
Unmasks 00003 (interrupt input 0), masks others.
Setting Quick-response
Inputs