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110 T1/T1S User’s Manual
6. Programming Information

6.6 User program configuration

A group of instruct ions 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 capacit y 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 sect ion 7. 1.
The figure below shows the T1/T1S’s m em or y configurat ion.
RAM
NOTE For conditions of tr ansfer between RAM and EEPROM, see section 5.2.
System information
Back-up ar ea
by EEPROM
2 k steps ( T1)
4 k or 8 k steps (T 1S) User program
Data registers
mentioned in
section 5.2
Other registers/
devices
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