Hitachi NT2021XA, Instruction Manual

Page: 40 / 84

Chapter 2 Syntax
timer set (timer-start instruction) Instruction to set and start the timer counter
- Format
Format Description
timer set TD (k) <variable> or <constant>
This instruction sets <variable> or <constant> in the k'th
timer and starts the timer counter.
- Explanation
(1) The timer set instruction sets <variable> or <constant> in the k'th timer buffer, clears the timer counter (up counter) “TC
(k)” to zero, and then initiates counting by the timer counter. Then, the value of timer contact variable “TD (k)” is “0” (off).
(2) Subsequently, the instructions described after the timer set instruction are executed.
(3) When the timer counter “TC (k)” reaches the specified count, the value of timer contact variable “TD (k)” changes to “1” (on)
(only once). Then, the timer counter “TC (k)” stops counting.
- Sample program
Label Mnemonic parameter1 parameter2 parameter3 parameter4 parameter5
㩷
㩷
㩷 䋺
㩷 㩷 㩷 㩷 㩷 㩷
㩷
FW= 1
㩷 㩷 㩷 㩷
㩷
timer set TD(0) 5.00
㩷 㩷 㩷
: Start the 5-second timer counter.
㩷
wait TD(0) = 1
㩷 㩷
: Wait until "1" (on) is set in TD (0).
㩷
Y(00)= 1
㩷 㩷 㩷 㩷
㩷
㩷 䋺
㩷 㩷 㩷 㩷 㩷 㩷
-
േ૞଀
(
࠲ࠗࡒࡦࠣ࠴ࡖ࡯࠻
)
timer set TD (k) 1000 timer set TD (k) 1500
TC (k)
TD (k)
timer off TD (k)
Comparison
for matching
1500
1000
2^31-1 2^31-1
Timing chart for operation using the timer set instruction
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