4-2. LC Programming Approach
U3-1021 4-6 2/99
Westinghouse Proprietary Class 2C
Provided Algorithms
The following Ovation text algorithms are provided for LC applications:
• SLCAIN reads up to 16 analog point values from an LC (or redundant pair of
LCs). The values are read from consecutive registers in the LC static RAM,
starting at a user-specified register. The data format may be specified as integer,
real (Intel floating point format), or real with status word (1W record field).
• SLCAOUT writes up to 16 analog point values to an LC (or redundant pair of
LCs). The values are written to consecutive registers in the LC static RAM,
starting at a user-specified register. The data format may be specified as integer,
real (Intel floating point format), or real with status word (1W record field).
• SLCDIN reads up to 16 digital point values from an LC (or redundant pair of
LCs). The values are read from consecutive registers in the LC static RAM,
starting at a user-specified register. Each digital point occupies one data register
(equivalent to the 1W record field).
• SLCDOUT writes up to 16 digital point values to an LC (or redundant pair of
LCs). The values are written to consecutive registers in the LC static RAM,
starting at a user-specified register. Each digital point occupies one data register
(equivalent to the 1W record field).
• SLCSTATUS reads hardware and user application status values from an LC (or
redundant pair of LCs). The hardware status information returned includes the
watchdog timer status and configuration switch settings. The application status
values can be used to specify a drop fault code and parameters, as well as
auxiliary information required by the specific application. The status
information is placed in packed points.
The LC application program must be designed to convert data to and from the
formats used by the SLC algorithms, as necessary. In addition, the program must
read and write data to the appropriate locations within the LC static RAM
(corresponding to the registers/buffers specified by the SLC algorithms).
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