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T1/T1S User’s Manual
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
(R/RW)
User specified retentive registers and forced coil devices
are retained. Others are cleared to 0.
Special device/register
(S/SW)
Special setting data are retained. Others are cleared to 0.
Timer device/register
(T./T)
User specified retentive registers are retained. Others are
cleared to 0.
Counter device/register
(C./C)
User specified retentive registers are retained. Others are
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
registers should be specified as retentive. Otherwise, these data are
transferred from EEPROM to RAM, but then cleared to 0 at the
initialization.
(2) The data in the retentive registers are stored in RAM and backed up by
built-in capacitor. The back-up period is 6 hours or more at 25
°
C (T1), or
168 hours or more at 25
°
C (T1S).
The T1/T1S checks the validity of the retentive data at the power-up
initialization, and if they are not valid, sets the special device (S00F) to ON.
Therefore, it is recommended to check the status of S00F in the user
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
and D registers. The registers from address 0 to the designated address
for each type are set as retentive registers. Refer to the separate manual
for the programming tool for setting the retentive registers.
(4) The input force and the forced coil are functions for program debugging.
For details, refer to section 6.7.
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