BAL SX602 PFN RT
18/36
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9
Operating mode 'Dynamic and static texts'
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Operating mode
In menu item 01 the setting
is to select (see Chapter 11).
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Output data bytes
In menu item 02 the number of output data bytes (8, 16, 32, 64) is set (see Chapter 11). The number
of input data bytes is 1.
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Configuration inside IO controller
The module "001 Byte IN HANDSHAKE" from file 'RT INPUT/OUTPUT' in the hardware catalog has to
be plugged into slot 1 of the device. A module with the same number of bytes as set in menu point 2,
has to be plugged into slot 2 from file “RT INPUT/OUTPUT” (see Chapter 11). Other configurations are
not allowed.
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Example of configuration
The display is to be controlled with 8 bytes of output data. The configuration of the IO device is as
follows:
Slot 1
001 byte IN handshake
Slot 2
008 bytes OUT handshake and dynamic text
The following settings have to be made in the menu:
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Data transmission
Due to the system the data transfer within the Profinet IO is cyclically. The data in the input and output
range of the IO controller are exchanged cyclically between IO controller and IO device This is why
data modified by the handshake method must be marked as 'new'. The new data are applied once,
whereas their cyclic repetition is ignored.
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Block diagram of the handshake method
After switching to the DATA EXCHANGE status (display parameterized and recognized as Profinet IO
device), the display sets the RxHS bit to the initial value 0. When switching to the DATA EXCHANGE
status, the IO-Controller must likewise set the TxHS bit to 0.
TxHS-Bit:=0
New data
to display?
RxHS-Bit
==
TxHS-Bit?
Toggle
TxHS-Bit
Build new
data block
Write data block (TxHS-
Byte and data) consistently
to output bytes (special
PLC function)
No
Entry of
state DATA-
EXCHANGE
No
The display is ready to receive as soon as the RxHS bit has the same value as the TxHS bit sent last.
Now new data can be transmitted from the IO controller to the display. The controller signals new data
by inverting (toggling) the TxHS bit. The new data and the modified TxHS byte must be written
consistently to the output data area by means of special master functions. After a short processing
time, the display signals again readiness to receive by setting the RxHS bit equal to the TxHS bit
received last.
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