Toshiba PROSEC T3H user manual 28

28 PROSEC T3H
2. Expanded Functions
2.1 System operation
2.1.1 Auto-RUN / Standby selection
The initial operation mode (HALT or RUN) just after power on is determined by the
user-setting status of the Auto-RUN / Standby selection.
When the setting status is;
Auto-RUN: The T3H’s initial operation mode is determined by the mode control
switch (HALT / RUN / P-RUN). When this switch is in RUN or P-RUN,
the T3H moves into RUN mode automatically.
Standby: The T3H stays in HALT mode regardless of the mode control switch
(HALT / RUN / P-RUN) after power on. Then the operation mode can be
changed manually, i.e. by programmer command or by changing the
mode control switch.
The Auto-RUN / Standby selection is included in the system information memory, and
the selection is made by using the programmer.
2.1.2 Timer interrupt interval
In the T3H, the timer interrupt program is available with the interval setting of 1 to
1000 ms in 1 ms increments.
(In case of the T3, it is 2 to 1000 ms in 1 ms increments)
In case of the T3H, SFC (Sequential Function Chart) can also be programmed on the
interrupt program, as well as Ladder diagram.
NOTE
NOTE
(1) The default setting is Standby.
(2) Different from the T3H, in case of the T3, this selection is made by the
hardware switch (RAM/ROM switch).
If you use the timer interrupt with 1 ms interval, consider to minimize the
execution time of the timer interrupt program. If the interrupt task requires
long time, the T3H cannot assign enough time for main program execution.
As the result, scan time over error will occur.