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Siemens SIMATIC S5 CP 523 Manual Page 17

Serial i/o module.
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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

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