6F3B0250
5. Operating System Overview
Hardware check:
Performs checking and initialization of the system ROM, the system RAM and the peripheral LSIs.
Initial load:
Transfers the user program and user data from the EEPROM to the RAM. (Refer to section 5.2)
Register/device initialization:
Initializes registers and devices as shown below.
Register/device | Initialization |
External input (X/XW) | Forced inputs are retained. Others are cleared to 0. |
External output (Y/YW) | Forced coil devices are retained. Others are cleared to 0. |
Auxiliary device/register | User specified retentive registers and forced coil devices |
(R/RW) | are retained. Others are cleared to 0. |
Special device/register | Special setting data are retained. Others are cleared to 0. |
(S/SW) |
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Timer device/register | User specified retentive registers are retained. Others are |
(T./T) | cleared to 0. |
Counter device/register | User specified retentive registers are retained. Others are |
(C./C) | cleared to 0. |
Data register (D) | User specified retentive registers are retained. Others are |
| cleared to 0. |
Index register (I, J, K) | Cleared to 0. |
NOTE | (1) | When the data stored in the EEPROM (Data registers) are used, these |
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| registers should be specified as retentive. Otherwise, these data are |
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| transferred from EEPROM to RAM, but then cleared to 0 at the |
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| initialization. |
| (2) | The data in the retentive registers are stored in RAM and backed up by |
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| |
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| 168 hours or more at 25 °C (T1S). |
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| The T1/T1S checks the validity of the retentive data at the |
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| initialization, and if they are not valid, sets the special device (S00F) to ON. |
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| Therefore, it is recommended to check the status of S00F in the user |
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| program and to initialize the retentive registers if S00F is ON. |
| (3) | The retentive registers can be set by the programming tool for RW, T, C |
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| and D registers. The registers from address 0 to the designated address |
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| for each type are set as retentive registers. Refer to the separate manual |
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| for the programming tool for setting the retentive registers. |
| (4) | The input force and the forced coil are functions for program debugging. |
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| For details, refer to section 6.7. |
88 T1/T1S User’s Manual
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