Omron C200H-TV Series Operation Manual page 54

Programming
Timing for a Read Operation
1, 2, 3...
I/O Refresh
The Loop 1 and 2 executed bank number (Wd n+2) sets data directly. The
data is written to the Heat/Cool Temperature Control Unit RAM. If the value
is set out of this range, the bank number reverts to the previous value (de-
fault value = 1).
Command (n)
Read complete ON
(Wd n+6), bit 00
OFF
Read data
(Wd n+5)
1. The read data is output to Wd (n+5) approximately 140 ms after the Read
command is executed.
2. The read data is updated every 100 ms.
3. When the Read command is modified, turn OFF the Read Complete Flag to
execute the next read operation.
Heating and cooling control will not be executed properly unless there are at
least 8 ms between I/O refresh operations. When creating the program, be
sure that all of the conditions described below are satisfied.
The cycle time must be a minimum of 8 ms. If the program processing time is
short, it is recommended that the fixed cycle time instruction, SCAN(18), be
used.
When IORF(97) is executed for the Temperature Control Unit, there must be
an interval of at least 8 ms between prior and subsequent end refreshes.
The time interval for executing IORF(97) must be a minimum of 8 ms.
Normal I/O refresh
Normal I/O refresh
IORF(97)
IORF(97)
Normal I/O refresh
Command (A)
Approx.
140 ms
Read data (A)
(End refresh)
(End refresh)
(I/O refresh instruction)
(I/O refresh instruction)
(End refresh)
Section 4-3
Command (B)
Read data (B)
8 ms min. (cycle time)
8 ms min.
8 ms min.
8 ms min.
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