3 Product Description HIMax System
HI 801 001 E Rev. 4.01 Page 42 of 122
DANGER
If the output noise blanking
is active, the time values set in the HIMax system must
be recalculated.
Take into account that a safe reaction to an existing interference can be delayed up
to 2 * safety time
if a transient interference is suppressed by the processor module
(X-CPU) as well as by the output noise blanking.
Only activate the output noise blanking after receiving consent from the HIMA Cus-
tomer Support.
3.6 Alarm and Sequence of Events Recording
The HIMax system is able to record alarms and sequence of events (SOE).
3.6.1 Alarm and Events
Events are state changes of a variable that are performed by the plant or controllers and
are provided with a timestamp.
Alarms are events that signalize an increasing risk potential.
The HIMax system records the state changes as events specifying the time point when they
occurred. The X-OPC server transfers the events to other systems such as control
systems, that display or evaluate the events.
HIMax differentiate between Boolean and scalar events.
Boolean Events:
Changes of Boolean variables, e.g., of digital inputs.
Alarm and normal state: They can be arbitrarily assigned to the variable states.
Scalar Events:
Exceedance of the limit values defined for a scalar variable.
Scalar variables have a numeric data type e.g., INT, REAL.
Two upper limits and two lower limits are possible.
For the limit values, the following condition must be met:
Highest limit ≥ upper limit ≥ normal area ≥ lower limit ≥ lowest limit.
An hysteresis can be effective in the following cases:
- If the value falls below the upper limit.
- If the value exceeds the lower limit.
An hysteresis is defined to avoid a needless large number of events when a global variable
strongly oscillate around a limit.
HIMax can only create events if they are configured in SILworX, see Chapter
5.2.6.
3.6.2 Creating Events
Both the processor module and certain types of I/O modules are able to create events. In
the following sections, these I/O modules are referred to as SOE modules.
Creating Events on the Processor Module
The processor module uses global variables to create the events and stores them in the
buffer, see Chapter
3.6.3. The events are created in the user program cycle.
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