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T1/T1S User’s Manual
5. Operating System Overview
5.1 Operation modes
The T1/T1S has three basic operation modes, the RUN mode, the HALT mode and the
ERROR mode. The T1/T1S also has the HOLD and RUN-F modes mainly for system
checking.
RUN:
The RUN mode is a normal control-operation mode.
In this mode, the T1/T1S reads external signals, executes the user program
stored in the RAM, and outputs signals to the external devices according to the
user program. It is in the RUN mode that the T1/T1S performs scans the user
program logic, which is the basic operation of a PLC.
In case of the T1S, program changes and EEPROM write are possible while
the T1S is in the RUN mode. Refer to section 6.9.
On the other hand, in case of the standard T1, program changes and
EEPROM write are not possible in the RUN mode.
HALT:
The HALT mode is a programming mode.
In this mode, user program execution is stopped and all outputs are switched
off.
Program loading into the T1/T1S is possible only in the HALT mode.
For the standard T1, program changes and EEPROM write are possible only
when the T1 is in the HALT mode.
ERROR:
The ERROR mode is a shut-down mode as a result of self-diagnosis.
The T1/T1S enters the ERROR mode if internal trouble is detected by self-
diagnosis. In this mode, program execution is stopped and all outputs are
switched off. The cause of the shut-down can be confirmed by connecting the
programming tool.
To exit from the ERROR mode, execute the Error Reset command from the
programming tool, or cycle power off and then on again.
HOLD:
The HOLD mode is provided mainly for checking the external I/O signals.
In this mode, user program execution is stopped, with input and output
updating is executed. It is therefore possible to suspend program execution
while holding the output state. Moreover, a desired output state can be
established by setting any data by using the programming tool.
RUN-F:
The RUN-F mode is a forced RUN mode provided for program checking.
This mode is effective when using the expansion I/Os.
Deferent from the normal RUN mode, the RUN-F mode allows operation even
if the registered option cards, expansion unit and/or I/O modules are not
actually mounted.
CTi Automation - Phone: 800.894.0412 - Fax: 208.368.0415 - Web: www.ctiautomation.net - Email: info@ctiautomation.net