Siemens SIMATIC S5 CP 523, Manual

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CP 523 Technical Description
2 Technical Description
2.1 Principle of the CP 523
The CP 523 handles data transfer with a peripheral device autonomously. Data transfer between
the CPU and the CP 523 must always be started by the CPU by sending a job request to the CP 523.
Typical jobs would be, for example, ”Print message text number 20” in Print mode or ”Receive a
message frame from a peripheral device” in Communications mode.
Figure 2-1. Schematic Representation of the CP 523
RS-232-C (V.24) serial
interface or TTY
interface
(25-pin subminiature D
Cannon connector) of
peripheral device (printer,
barcode reader, CP 523,
etc.)
CP 523
EPROM / EEPROM
memory submodule
DB1 (parameter setting data
for the serial interface and
configuration data for the
format of message text
printouts)
DB2 to 255 (up to 4095
message texts)
RAM
Send mailbox
Receive mailbox
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buffer
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Micro-
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Operating system
memory
Integral real-time
clock
Internal bus
8-byte
transfer
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S5 Bus
Print mode
The "Print message text XY" job request causes the message text stored in the memory submodule
under the number XY to be transferred to the printer via the serial interface. Current values of
variables, time of day and date can be entered in the message text during this process. You can
configure up to 4095 different message texts and store them in the memory submodule. You can
also include control commands for the printer in the message text. These are then executed on
printout (double-width type on/off).
EWA 4NEB 811 6044-02a
2-1