Omron C200H-ASC11 Manual page 116

IOWR/IORD Instruction Specifications
Note Only one IOWR/IORD instruction (control code #FD00) can be executed dur-
ing a single cycle.
Note 1. The Equals Flag (SR 25506 for the C200HX/HG/HE) turns ON when pro-
cessing to the ASCII Unit by IOWR/IORD instructions has finished normal-
ly. It remains OFF when processing to the ASCII Unit does not finish
normally. After turning ON, it turns OFF at the execution of the next IOWR/
IORD instruction. Since the Equals Flag will change at the execution of oth-
er instructions/commands as well (such as comparison instructions) be
careful when writing programs.
Normal Completion
Equals Flag
Abnormal Completion
When ON at previous
ladder instruction
1
Equals Flag
0
2. The ASCII Busy Flag (IR/CIO n + 5 bit 00) turns ON when the ASCII Unit
is exchanging data with the CPU Unit.
Execution n+5 bit
conditions 00
ASCII Busy
Flag
B
IOWR/IORD instruction
execution
When ON at previous
ladder instruction
1
0
IOWR/IORD instruction
execution
A
IOWR
C
S
D
B
A
25506
Equals Flag
(See note 1.)
I/O refresh
Time
Set to allow retry of
IOWR/IORD instruction
Section 6-5
I/O refresh
Time
107