Communications configuring
3-276
System- and communication configuring D7-SYS - SIMADYN D
Edition 12.2003
The function block CDC4 (Communication Distribute Channel 4), sub-
divides a channel in up to 4 channels. The channels may have different
address data, be located on different data interfaces, and have different
data transfer modi as well as channel lengths.
In order that the function block can operate, the receive channel must be
sub-divided into at least 2 transmit channels (CT1- and CT2 input data
are mandatory).
When sub-dividing a channel into only 2 channels, a "0" (zero) must be
configured at initialization inputs CT3 and CT4. AR3, AR4, MO3, MO4,
LT3 and LT4 are, in this case, no longer evaluated.
The receive channel is specified at inputs CTS, AT and MOD. The length
of the net data to be received is obtained from the sum of the transmit
data.
NOTE
If one of the transmit channels is configured in the handshake mode and
precisely this channel is not read-out on the receive side, then the CDC4
function block cannot operate until this one channel has been read-out. In
this case, the block is temporarily inhibited.
3.24.2.3
Compatible net data structure
For blocks CCC4 and CDC4, the net data are unstructured (data type,
octet string). Thus, they are compatible to any net data structure. In order
that the transmitter and the associated receiver can correctly synchronize
with one another, only the net data lengths must be identical.
3.24.3 Diagnostic
outputs
After each processing cycle, the result of the processed data interface(s)
is output at the YEV output of the transmit- and receive blocks as well as
the channel marshalling blocks (CTV, CRV, CCC4, CDC4). The YEV
output is the WORD type; the 16 bits are sub-divided into three areas:
15
14
13
12
11
10 9 8 7 6 5 4 3 2 1 0
Channel statuses
(only CCC4, CDC4)
Channel assignment
(only CCC4, CDC4)
Fault cause
Table 3-91
Diagnostic outputs
3.24.3.1 Fault/error
cause
The possible fault/error cause is displayed in bits 0-7 in the form of a
hexadecimal value (this should not be evaluated bit-coded):
Prerequisites
Data entries at
inputs CT3, CT4
Data entries at
inputs CTS, AT,
MOD
General
Hexadecimal value
