Change Monitoring And Generation Of Messages With Time Tag - Siemens CP-8000 User Manual

The activation of the element or function to be controlled is the task of the open-/closed-loop
control function.
For the proper operation of this function, information is required by the open-/closed-loop control
function (e.g. from an interlocking logic) for the choice of a posi-tive or negative confirmation.
The treatment for commands can be activated individually for each command via a parameter.
The treatment for pulse command comprises the following processing functions:
·
Prepare command output procedure
─ Formal check
─ Retry suppression
─ 1 out of n check
─ Direct command or
─ Select and execute command
─ Control location check
─ Command locking
·
Initiate command output procedure
─ Command to application program
·
Monitor pulse duration (only pulse commands)
─ Command output time
─ Return information monitoring
·
Terminate command output procedure
3.3.1.2

Change Monitoring and Generation of Messages with Time Tag

For the generation of messages with process information, the signals in the output process imag-
es that are assigned to an element of a spontaneous information object, are monitored for
change.
The change monitoring takes place in the grid of the cycle time of the open-/closed-loop control
function, in which the signal is assigned to a spontaneous information object.
On a change of the state in a corresponding element of the spontaneous information object,
the generation of the message is initiated.
If a spontaneous information object has been activated for transmission due to a change, a
message with process information is generated. The time tag corresponds either cycle-
synchronous with the current time (resolution corresponds with the cycle time) or the time in-
formation from an assigned spontaneous information object.
SICAM A8000 / CP-8000 • CP-8021 • CP-8022 Manual
DC8-037-2.02, Edition 10.2017
Unrestricted
Function Packages
69