Omron SYSMAC CS Series Operation Manual page 276

C200H High-density I/O Units (Special I/O Units)
High-speed Inputs
238
Data input
DATA 0 to 7
Strobe output
STB 0
STB 1
STB 2
to
STB 7
DATA 8 to 15 can also be output as STB 8 to 15 at the same time.
The inputs 8 to 15 from the CN2 connector can be used for pulse input. The
minimum pulse width is 1 ms or 4 ms (selectable).
A High-density I/O Unit will recognize a pulse input when the pulse input
occurs (i.e., the inputs turns ON and then OFF again), and the pulse width is
greater than 1 ms or 4 ms (according to the selected minimum pulse width).
The data is refreshed in the Special I/O Unit Area (word n + 1, bits 8 to 15) of
I/O memory during the CPU Unit's I/O refresh period.
High-density I/O Unit
High-speed
input buffer
1 ms or 4 ms
The High-density I/O Unit data in the high-speed input buffer can also be
refreshed during program execution by executing the IORF(097) instruction
for the desired Special I/O Unit.
High-density I/O Unit
High-speed
1 ms or 4 ms
input buffer
Word n Word n Word n + 1
Rightmost Leftmost Rightmost
bytes bytes bytes
I/O refresh
I/O refresh
Section 3-7
Word n + 3
Leftmost
bytes
CPU Unit
+
CPU Unit
+
+