Siemens SIMATIC S5 CP 523 Manual page 17

CP 523
EPROM/EEPROM
You can use EPROM and EEPROM memory submodules of up to 32K bytes. The EPROM/EEPROM is
configured with the programmer.
• Print mode
In Print mode, the parameter setting data for the serial interface and for the format of the
printout is defined in data block 1 (DB 1) on the memory submodule. You can configure up to 4095
different message texts in DBs 2 to 255.
Note:
The CP 523 can be operated in Print mode only if a memory submodule containing at least one
message text is plugged in.
• Communications mode
You can define the parameter setting data for the serial interface in DB 1 on the memory
submodule.
Note:
In Communications mode, the CP 523 can also be operated without a memory submodule, in
which case the parameter setting data for the serial interface is then transferred from the user
program to the CP.
Integral real-time hardware clock
The CP 523 has an integral real-time hardware clock. The clock can be set and read either with a
programmer or in the user program.
The clock is optimized for an ambient temperature of 25 °C. A correction factor can be pro-
grammed to compensate for this temperature dependency. This correction factor can be trans-
ferred to the CP from the user program or it can be programmed in DB 1 on the memory submo-
dule.
Addressing
The CP 523 is addressed as an eight-byte input/output module in I/O areas P, O, IM3 and IM4. You
can set the desired start address of the module in eight-byte steps via DIP switches on the mo-
dule ( 5).
Note:
Byte numbers 0 to 7 specified in this manual always refer to the start address set:
Example: You have set start address 128 with the DIP switches.
Byte 0 has address 128+0=128
Byte 7 has address 128+7=135
EWA 4NEB 811 6044-02a
Technical Description
2-3