User Archive Read Manager; Function Block "Fb_Ua_Rm - Siemens SIMATIC PCS 7 System Manual

3.2

User Archive Read Manager

The User Archive Read Manager consists of the "FB_UA_RM" function block and executes
the following functions:
● Reading one or more data records from the OS user archive to a data block on request
● Transferring read data to the requesting block
● Monitoring communication (generation of alarms)
No picture objects are required for the User Archive Read Manager. Execution of the User
Archive Read Manager is triggered via the interconnected APF modules.
3.2.1

Function block "FB_UA_RM"

Upon request, the "FB_UA_RM" function block reads data from an OS user archive via the
"BRCV" communication block (SFB13). It transfers the read data to the requesting block in the
AS.
Communication between the requesting block and the "FB_UA_RM" function block occurs at
the AS level using the "UDT_UA_R_REQ_ST" (request) and "UDT_UA_R_ST" (feedback)
structures.
The "FB_UA_RM" block can manage a maximum of 128 requests. Each request occupies a
separate structure input (UDT_UA_R_REQ_ST). The requesting block transfers its uniquely
identifying ID (REQ_ID) to the structure.
The read data are made available at an output structure (UDT_UA_R_ST) and identified with
the REQ_ID associated with the job. As a result, the requesting block is able to recognize that
the data belong to its read request.
OS tags are used to coordinate the data communication between the AS and OS. Appropriate
scripts associated with the function block and its functionalities are triggered for operator
control at the OS level.
Advanced Process Functions Engineering Manual
System Manual, 07/2016, A5E38719921-AA
Configuring AS-OS communication
3.2 User Archive Read Manager
15