Siemens SIMATIC PCS 7 Function Manual page 8

Overview of the Block Description
● Attr. (Attribute)
Table 1-3 Parameter properties
Abbreviation Attribute
Q Interconnectable
The I/O can be interconnected with another output of the same type.
U Hidden in the CFC
The I/O is not displayed in CFC (for example, the message ID), since this in supplied by the block itself or by
the OS block. This default setting can be changed in the CFC.
OCM
Parameters identified by the "+" character can be monitored and controlled using the
corresponding OS block.
Valid values
Valid limit within the range of values of the data type
Operating control and monitoring of ...
If an OS block exists for the PLC block, the fields on the faceplate are described in the table.
8
Additional characteristics of the parameter when used in CFC. Input and output
parameters that are not interconnected can have parameters assigned (input/output
parameters only with online FCs).
Output parameters cannot have values assigned and can be transferred in CFC by
interconnecting them to an input of the same data type.
Additional or deviating parameter properties will be specified as follows:
SIMATIC BATCH Interface Blocks V7.1
Function Manual, 03/2009, A5E02171101-01