User Programmable Events - Satec System 295 Installation And Operation Manual

The setpoint will be operated continuously at specified intervals when the gating
conditions are fulfilled, and will be stopped when they are not. For example, the user
can perform time-gated data recording each 5 seconds for two hours from 8:00 to
10:00, or generate pulses through relay output each one second with the pulse
duration of 0.5 second to flash an alarm signal when high current on any phase
exceeds the predefined threshold, etc.
NOTE
The timer expiration is a volatile event. It can trigger the setpoint operation, but will be
cleared immediately as the setpoint is operated, to provide the next timer run. This will
cause the setpoint to be released. The user may not trigger multiple setpoints with the
same timer, because the first of them will always intercept the timer event, and at the time
that other setpoints are checked, the timer event will simply not exist. To use the timer
event for multiple setpoints, you will need to hold the timer event using programmable
event flag, and than use the flag as a trigger.

4.14 User Programmable Events

Eight user programmable events are provided by the PM295 for remote (manual)
control over setpoint operations, and for more sophisticated setpoint programming.
Each event can be asserted or cleared independently by setting (ON) or clearing
(OFF) the dedicated event flag. The user can do that via communications, or by a
setpoint action. Each programmable event can be used to trigger operation of any
number of setpoints. For more information on using programmable events, see
Section 4.17.7 "Setpoint Programming Techniques".
Manual Setpoint Operations
Each setpoint can be manually operated or released. To provide manual control over
the setpoint operations, the programmable event can be connected to the end of a list
of the present setpoint conditions using an OR/AND tie. With an OR operation, a
manual operate condition will be asserted when the user sets the event flag to ON.
With an AND operation, a manual release condition will be asserted if the event flag
is cleared. Two event flags can be used to provide both manual operate and release
commands for the setpoint.
Binding the Setpoints
The event flags can be used to attach one setpoint to another when the number of
conditions for the setpoint operation or the number of the setpoint actions need to be
enlarged. In both cases, the first setpoint in the chain should set some event flag, and
the others should monitor the event to be operated at the time the flag is set. The last
76 Operation Techniques