Toshiba 6F3B0250, PROSEC T1 T1S Self-diagnosis, Mode control, Program check, Update, Timer update

6F3B0250

5. Operating System Overview

Self-diagnosis:

Checks the proper operation of the T1/T1S itself. If an error has detected and cannot be recovered by re-tries, the T1/T1S moves into ERROR mode. For the self-diagnosis items, refer to section 10.2.

Mode control:

Checks the mode control switch status and the mode control request commands from the programming tool.

The scan mode - floating scan or fixed-time scan - is also controlled hear.

NOTE

The floating scan:

When one scan is finished, immediately starts the next scan. The scan time is shortest, but may vary depending on the program execution status.

Scan time

Scan time

Scan time

The fixed-time scan:

The scan operation is started every user-specified time. The time setting range is 10 to 200 ms (10 ms units). If an actual scan needs longer time than the setting time, it works as the floating scan.

Scan time (50 ms fixed) Scan time (50 ms fixed)

(idling)

(idling)

Program check:

At the beginning of the RUN mode, the user program is compiled and its validity is checked.

I/O update:

Reads the external input signals into the external input devices/registers (X/XW), and sends the data of the external output devices/registers (Y/YW) to the external output circuits. Then the outputs (relays, etc.) changes the states and latches until the next I/O update timing.

The states of the forced input devices are not updated by this operation.

Timer update:

Updates the timer registers which are activated in the user program, and the timing devices (S040 to S047).

Basic Hardware and Function 89

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