Siemens SIMATIC TI555 - Real-Time Clock; Programming Software; Program Storage in EEPROM; Program Storage in EPROM

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System Overview TI545/TI555 System Manual
Hardware Description (continued)
The CPU contains a real-time clock which includes the following
information:
• Y
ear (two digits), Month, Day of month, and Day of week.
• Hour , minute, second, tenths and hundredths of a second.
Y ou can use APT to program the CPU. APT is a graphic programming
environment that eliminates the need for you to work in relay ladder logic
when you create your application program. APT presents a familiar
structure for process engineers, allowing them to become more closely
involved in up-front design work. When the APT program is compiled, an
RLL program code is produced, generating the language with which the
electrician or maintenance person is already familiar . Refer to the APT
manual set for more information.
Y ou can use the TISOFT programming software to create and edit your
application program. TISOFT allows you to work directly in the ladder logic
environment as you design the RLL program. For loops, analog alarms, and
SF programs, TISOFT presents menu-driven programming tools.
T o program the latest features that are described in the Preface of this
manual, you need TISOFT Release 5.0, which runs on an IBM PC/AT (386
or higher) compatible personal computer running MS-DOS  3.3 or later .
Refer to your TISOFT manual for detailed instructions about how to enter a
program.
The CPU offers the option of saving your RLL program in a non-volatile
form by downloading it to an EEPROM integrated circuit as shown in
T able 1-2. A separate programming device is not necessary . Once
programmed, an EEPROM can be removed and used in any Release 3.0 or
higher CPU as required. T o help ensure equipment compatibility , use only
the EEPROM model supplied by your distributor .
If your operating program does not change, you can store it permanently on
EPROM(s) as shown in T able 1-2. By copying your program from an
EEPROM to an EPROM (using an EPROM copier), you can create
additional copies for CPUs that are running the same program.
T able 1-2 Pr ogram Storage Using EEPROM and EPROM
Storage Type Size Order Number
EEPROM 128K bytes 2587681–8022
EEPROM 256K bytes 2587681–8030
EPROM 128K bytes 2587681–8023
EPROM 256K bytes 2587681–8031
Real-time Clock
Programming
Software
Pr
ogram Storage
in EEPROM
Pr ogram Storage
in EPROM