Communications configuring
3-262
System- and communication configuring D7-SYS - SIMADYN D
Edition 12.2003
Task ID
PR
Possible response IDs
PRR
0 0,6
1 1,6
2 2,3,6
3 2,6,7
4 3,6,7
5 4,5,6
6 4,6,7
7 5,6,7
8 2,6,7
9 3,6,7
10 4,6,7
11 5,6,7
Table 3-88
Task ID PR, response ID PRR
3.22.1.7 Task/response
assignments
If the @DPH central block set-up a task at its outputs, issued from a DPI
block, then it waits until this task is responded to in the specified
TIMEOUT. (Initialization input RCM, there is no TIMEOUT for RCM=0.).
In this case, the value RCM specifies the number of sampling times
which block @DPH waits for a response from the issued task before a
TIMEOUT message is generated. The inputs of the @DPH block are
checked at each cycle in order to define the response. If a response is
present at the inputs, which matches the task which was issued, then this
is transferred to the DPI block.
3.22.1.8 Cascading
By changing input IC with input EN set, a task is transferred to the central
block. If the response is received, or if input EN is not set, then output QC
is set.
A ”Round Robin” topology can be configured using several DPI blocks by
connecting the QC outputs with the IC inputs; in this case, the
interconnected DPI blocks can issue, one after the other, a task to the
central block. In the configuring example, block DPI1 would first issue a
task to the device; if DPI1 was to receive a response to this task (in this
case, it could also involve a TIMEOUT), then it negates its output QC.
Thus, DPI2 becomes active. By interconnecting to form a ring (QC from
DPI2 connected with IC from DPI1), it is ensured that only one DPI is
active. However, we would like to expressly point out that a non-activated
DPI block (connection EN is 0) does not diminish the ring functioning, as
a negation of input IC is also repeated at output QC.
Sequence
Sequence
