5: S
PECIAL
F
UNCTIONS
O
PEN
N
ET
C
ONTROLLER
U
SER
’
S
M
ANUAL
5-7
Catch Input
The catch input function is used to receive short pulses from sensor outputs regardless of the scan time. Input pulses
shorter than one scan time can be received. First eight inputs of every DC input module can be designated to catch a rising
or falling edge of short input pulses. The Function Area Settings is used to designate first eight inputs of every DC input
module as a catch input or normal input.
Input signals to normal input terminals are read when the END instruction is executed at the end of a scan.
Since these settings relate to the user program, the user program must be downloaded to the
OpenNet Controller
after
changing any of these settings.
Catch Input Specifications
Programming WindLDR
1.
From the
WindLDR
menu bar, select Configure > Function Area Settings. The Function Area Setting dialog box
appears.
2.
Select the Filter/Catch tab.
Module Number Selection
Select the module number from 1 through 15 to designate catch input or input filter
function. Module number 1 is the input module mounted next to the CPU module.
Module number 2 is the second from the CPU module, and so on.
Input Filter Time Selection
Input filter time is selected in groups of eight inputs. For example, input numbers of
module number 1 are divided into four groups:
IN_FLT0: I0 through I7 (only IN_FLT0 has effect on catch inputs)
IN_FLT1, IN_FLT2, and IN_FLT3 have no effect on catch inputs.
Select an input filter value from 0, 0.5, 1, 2, 4, 8, 16, or 32 msec for IN_FLT0 of each
DC input module.
Default: 4 msec
Catch Input Rising/Falling Edge Selection
Select catch input of rising or falling edge or normal input for the first eight inputs of
each DC input module.
Default: Normal Input
Minimum Turn ON Pulse Width
40 µsec (when the input filter is set to 0 msec)
Minimum Turn OFF Pulse Width
150 µsec (when the input filter is set to 0 msec)
Module Number Selection
Module 1 to 15
Input Filter Time Selection
Groups of 8 inputs
0, 0.5, 1, 2, 4, 8, 16, 32 msec
Default: 4 msec
Catch Input Rising/Falling
Edge Selection
Normal Input (default)
Catch Input Falling Edge
Catch Input Rising Edge
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