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The CP 521 SI (Serial Interface) communications module is a powerful I/O
module with its own central processor.
A separate manual is available for this module. It can be ordered under the
order number 6ES5 998–1UD11.
The following is an overview of the module's mode of operation.
Function
The CP 521 SI can be used for unidirectional and bidirectional data ex-
change.
Unidirectional Data
For unidirectional data traffic, the CP 521 SI is provided with a printer driver.
Exchange
If the printer driver is used, the following must be connected to the serial
interface of the CP 521 SI:
This enables you to log process states and process disturbances. The output of
messages on the printer does not extend the response time of the program-
mable controller.
The following messages and texts can be output:
The message texts are stored on an EPROM or EEPROM memory submodule
(up to 8/16 Kbytes).
Bidirectional Data
The following drivers are implemented for the bidirectional data exchange:
Exchange
The use of these drivers enables the transmission of data frames between the
CPU and an I/O device connected to the CP 521 SI.
The maximum data flow rate is 6 bytes of user data per 2 program cycles; i.e.
at a program cycle time of, for example, 50 ms a maximum of 60 bytes per
second can be transmitted.
ET 200U Distributed I/O Station
EWA 4NEB 812 6087–02b
A printer with TTY interface (active) or
A printer with V.24 (RS 232C) interface.
Message texts, which you have configured on a memory submodule in
data blocks DB 2 to 63.
Time of day and date, which are provided by the module's own clock
Values for variables which are transmitted to the CP 521 SI via the I/O
bus.
ASCII driver, transparent
ASCII driver, interpreting
"3964(R)" driver
SINEC L1 driver, master (point–to–point link)
SINEC L1 driver, slave
Terminal driver
Function Modules
9-69
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