STRASBAUGH, INC.
7AF SECS/GEM Interface Ver. 1.9 February 19, 2002 5-17
Strasbaugh Confidential
5-17
Table 14 7AF Related Variables
Variable Name VID
EQUIPMENTSTATE 17
PREVIOUS EQUIPMENTSTATE 16
PREVIOUSPROCESSSTATE 14
PROCESSSTATE 15
5.3.6 Related Collection Events
Many of the 7AF's collection events relate to process state changes. For a complete listing of these, see "Appendix B --
Collection Events".
5.4 Data Collection
5.4.1 Variables
The 7AF has a fixed set of Variables which can be read by the Host. Each Variable is identified by a unique Variable ID
(VID). The Variables which exist are shown in "Appendix A -- Variables".
There are three types of Variables: Status Variables, Data Variables, and Equipment Constants. The Host can read
Variables of any type, but can set values only for Equipment Constants. The Host can read values for Status Variables and
Equipment Constants whenever the 7AF is On-Line, but values for Data Variables are typically meaningful only
immediately after certain Collection Events (CEIDs), and so are typically reported only in Event Reports (S6F11).
5.4.2 Are You There
The Host can send S1F1 at any time to determine if the SECS link is operational. The 7AF responds with S1F2, if the
equipment is in the ONLINE and COMMUNICATING states. This indicates Model Number (MDLN) and Software
Revision Number (SOFTREV).
5.4.3 Host Requests Status
The Host can send S1F3 when the Equipment is On-Line to read Equipment Constants from the 7AF.
The Host can send S2F13 when the Equipment is On-Line to read Equipment Constants from the 7AF.
For this Equipment, S1F3 and S2F13 with a list of VIDs are essentially the same. That is, either message can return
Variables of any type. However, S1F3 with a zero-length list will return only VIDs of type SV, and S2F13 with a zero-
length list will return only VIDs of type EC.
5.4.4 Setting Equipment Constants
The Equipment Operator can change the value for Equipment Constants. Once the Operator has changed an EC value, the
Equipment will note the EqConstChange Event (CEID 7). The VID for the changed EC will be reported to the Host in the
variable ECIDCHANGE (VID 258).
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