Omron CP - PROGRAMMING MANUAL 05-2007 Programming Manual page 1036

Block Programming Instructions
Flags
Precautions
The first part of the block program is executed the first time the block program
is entered. When TMHW(815)/TMHWX(817) is reached, the Completion Flag
is reset to OFF, the timer is preset to the SV, and execution of the rest of the
block program will wait until SV has expired.
While the timer is timing down, only TMHW(815)/TMHWX(817) will be exe-
cuted to update the timer. When the timer times out, the Completion Flag will
turn ON and the rest of the block program will be executed. Once the entire
block program has been executed, the process will be repeated.
TMHW(815)/TMHWX(817) can be thought of as a WAIT instruction with a
timer for the execution condition and it can thus be used for timed step pro-
gressions.
executed.
SV preset.
Name Label
Error Flag ER
The rest of the block program following TMHW(815)/TMHWX(817) will be exe-
cuted if the Completion Flag for the timer is force set.
If the Completion Flag for the timer is force reset, the only TMHW(815)/
TMHWX(817) will be executed in the block program until the force reset status
is cleared.
The present value of timers programmed with timer numbers T0 to T15 will be
updated even when the timer is on standby. The present value of timers pro-
grammed with timer numbers T16 to T4095 will be held when the timer is on
standby.
The timer numbers are also used by the other timer instructions. Operation
will not be predictable if the same timer number is used for more than one
timer instruction. Use each timer number only once. The only way that the
same timer number can be used dependably is if only one of the timers is ever
operating at the same time. An error will occur in the program check if the
same timer number is used in more than one timer instruction.
An error will occur and the Error Flag will turn ON if an indirect IR designation
is used for N in BCD mode and the address is not for a timer present value or
if SV is not BCD. An error will also occur and the Error Flag will turn ON if an
indirect IR designation is used for N in binary mode and the address is not for
a timer present value.
"A"
Time elapsed.
"B" executed.
"C" executed.
Operation
ON if TMHW(815)/TMHWX(817) is not in a block pro-
gram.
ON if an indirect IR designation is used for N in BCD
mode and the address is not for a timer present value.
ON if in BCD mode and SV is not BCD.
OFF in all other cases.
Section 3-30
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