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T1/T1S User’s Manual
6. Programming Information
6.6 User program configuration
A group of instructions for achieving the PLC-based control system is called ‘user
program’. The T1 has 2 k steps capacity for storing the user program. And the T1S has 8
k steps capacity for storing the user program.
A ‘step’ is the minimum unit which composes an instruction. Number of steps required for
one instruction is depending on the type of instruction. Refer to section 7.1.
The figure below shows the T1/T1S’s memory configuration.
RAM
NOTE
For conditions of transfer between RAM and EEPROM, see section 5.2.
System information
Back-up area
by EEPROM
2 k steps (T1)
4 k or 8 k steps (T1S)
User program
Data registers
mentioned in
section 5.2
Other registers/
devices
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