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setpoint in the chain must clear the event for the setpoint chain to be operated once
more. Any number of setpoints can be bound into a chain.
Holding Volatile Events
Some events that can trigger setpoint operations may not be continually stored in the
Powermeter because of their volatile nature. Those are pulses sensed via discrete
inputs, pulses generated by the Powermeter, and timer events.
The instrument latches a pulse until the setpoint checks it and clears the event
immediately after that to provide a new event to be latched. If the user wants to bind
such an event with other conditions to operate the setpoint, the event must be held
until other setpoint conditions are fulfilled.
The timer event is cleared immediately after a setpoint is operated to provide the
timer to be run for the next lap. If the user wants to use it for operating multiple
setpoints, he must hold the timer event until the last setpoint is checked.
Using a programmable event flag, the user can store the volatile event by setting the
flag by a dedicated setpoint, and then continuously monitor other conditions being
combined with this flag to operate the setpoint at any time after the event occurred.
NOTES
1.
In the event of power loss, all programmable event flags will be saved. If any setpoint
has been forced operated or released using event flags, it will automatically return to
its state prior to loss of power when power is restored.
2.
The initial status of programmable event flags is undefined. It is therefore
recommended that the user brings an event flag to the expected state before using it.
4.15 On-Board Data Recording
The PM295 is equipped with a large size extended memory module for on-board
data recording. This is a nonvolatile 512K byte RAM with a battery back-up.
Configuring the extended memory and accessing the memory partitions can be made
only through communications. Use the PAS295 companion software to perform
operations on extended memory.
Operation Techniques
77
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