USSI Microlok II Functional description
UM-6800A Rev1.3 July 2005 Page 19 of 27
• When communications have not been established between the master and
a Serial Station, any output messages sent between the master and that
Serial Station contains all 0 values for the Application Variables.
5.1.2. GENISYS PROTOCOL
• The Genisys protocol supports from 1 to 32 Serial Stations per link. This
function will be Non-Vital.
• The Genisys protocol supports addresses between 1 and 255. This
function will be Non-Vital.
• The Genisys protocol supports Serial Stations having from 0 to 512 input
Boolean Bits and 0 to 512 output Boolean Bits in the Application Logic.
There must be at least one input or one output Boolean Bit defined for
each Serial Station. This function will be Non-Vital.
• The Stale Data Time-Out (SDTO) for the Genisys link will have an
allowable range of 1 to 600 seconds in 1 second increments. This time-out
will be reset each time a valid message is received. This Non-Vital
information will be included in the Application Configuration.
• At the expiration of the SDTO, the Serial Station’s System Status Variable
will be cleared. Input values will not be affected. This function will be Non-
Vital.
• The allowable range for the Polling Interval Timer will be 0 to 2.000
seconds in 10 millisecond increments. This Non-Vital information will be
included in the Application Configuration.
• The allowable range for the No-Response Timer will be 30 to 25000
milliseconds in 10 millisecond increments. This Non-Vital information will
be included in the Application Configuration.
6.1. MICROLOK II SOFTWARE
The primary Microlok II software components are the executive software,
which is actually the Microlok II operating system software, as well as the
application specific user-written software. Also included in the Microlok II
software architecture is self-checking diagnostics designed to support fail-
safe operational requirements. The following briefly describes the major
components of Microlok II software.
6.1.1. EXECUTIVE SOFTWARE
The US&S developed Executive software (Operating system) is standard for
all Microlok II systems, and is responsible for the overall vital monitoring and
control of the system. Executive software functionality includes vital input
monitoring, decision making, and commands related to interlocking
functions, monitoring vital input and output channels for intended on/off
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