User’s Manual
13
1. T3H Overview
Status LEDs:
RUN
Lit
User program is being executed (RUN mode)
(green)
Blink
User program execution is stopped (HOLD mode)
Not lit
User program execution is stopped (HALT or ERROR mode)
FAULT
Lit
CPU or program error
(red)
Blink
Hardware initialization error
Not
lit
Normal
I/O Lit
I/O
error
(red)
Blink
Hardware initialization error
Not
lit
Normal
BATT
Lit
Battery voltage is normal
(green)
Not lit
Battery voltage is low (battery replacement is required)
RAM/ROM switch:
RAM
User program stored in RAM is used.
(Program transfer from EEPROM to RAM is not executed)
ROM
At the beginning of RUN mode, user program stored in EEPROM is transferred to
RAM. (It is called Initial load)
If an IC memory card which contains user program has been installed, the IC
memory card becomes transfer source.
(If mode control switch is in P-RUN, the initial load is not executed)
Note) In case of T3, the RAM/ROM switch has the function of auto-RUN/standby
selection in addition to the initial load selection.
However, in case of T3H, the RAM/ROM switch only has the function of initial
load selection as mentioned above.
Mode control switch:
HALT
User program execution is stopped. (HALT mode)
Normally, programming is performed in the HALT mode.
T3H operation mode control by programmer is not allowed.
RUN
T3H executes user program cyclically. (RUN mode)
It is the normal switch position under operation.
Even in the RUN mode, program changes are possible. However, saving into the
EEPROM is available only in the HALT mode.
T3H operation mode control by programmer is possible.
P-RUN
T3H executes user program cyclically. (RUN mode)
User program and the leading 4 k words of D register (D0000 to D4095) are write-
protected.
T3H operation mode control by programmer is possible.
Note) In case of T3, even in P-RUN, data writing into D0000 to D4095 by instruction
is allowed except for some instructions.
However, in case of T3H, data writing into D0000 to D4095 by instruction is
inhibited if in P-RUN.
Содержание PROSEC T3H
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