Honeywell VRX180 user manual Parameters that control a profile’s execution, Discrete inputs

Setpoint Profiler

5.3 Parameters that control a profile’s execution

Coordinating operation of multiple profilers

In a multi-profiler instrument the profiles in a program can be totally unrelated to each other, that is, you can give them different times and settings. If you want the profilers to be coordinated, you must configure each profiler that way. For example, if you want all your profilers to be started by the same signal, you must configure each profiler with the same START parameter. The Copy Block function in the Program menu lets you copy parameters from one profiler to another.

SPP synchronization

Allows a multiple SPP user to synchronize several SPPs for when one enter hold due to a guaranteed hold, the others will enter hold and when the one that entered hold leaver hold the others will leave hold also. This is done by using a block output status called SG (status guaranteed hold) that is high when the block is in guaranteed hold mode. If different SPPs are used, the SPPx SG outputs should run through an OR block and then the output of the OR block back to the SPPx HOLD input. The SG status output may be viewed on the discrete status screen.

Discrete inputs

You can program a profiler with discrete inputs that enable you to reset, start, hold, advance, shut down, or fast forward through the profiler, hot start the profiler from a live process variable, increment a ramp segment, or enable/disable guaranteed soak. See Table 5-2.

Note that some discretes are edge-sensitiveand some are level-sensitive. Edge-sensitive means that the action is triggered by the discrete’s transition from OFF to ON (rising edge) or from ON to OFF (falling edge). The changing status is what triggers the action, not the status itself. Some discretes, such as START, are rising edge-sensitive only and are not affected by a falling edge. When START’s discrete goes ON, the profiler starts to run; when the discrete goes OFF, the profiler continues running.

Level-sensitive means that one action occurs while the discrete is ON and another action occurs while the discrete is OFF. The status is what causes the action, not the changing status. Fast forward’s discrete is level-sensitive; that is, the profiler will run in fast forward while the discrete is ON but not while it is OFF.

Table 5-2 Parameters That Control Profiler Execution

Paramet	Definition	Triggere	Conditions	Result
er name		d by	present
START	Starts Profiler from Ready, Hold, or End state.	Rising	Profiler in Ready or	Profiler
	Activated by operator menu or by discrete input.	edge	End state	starts to
	May be connected to the F1 key (SY1F1).			Run.
RESET/	The behavior of this parameter depends on START.	Rising	Start is	Profiler
RUN	If the START discrete input is programmed with a	edge	programmed with a	changes to
	discrete, then switching RESET/RUN from OFF to		discrete parameter	Ready and
	ON resets an Ended, Hold, or Ready profiler to the		& profiler is in	goes to
	starting value of segment 1.		Ready or Hold or	Segment
	If the START discrete input parameter is not		End	#1.
		Rising	START is not	Profiler
	programmed with a discrete, then switching	edge	programmed with a	changes to
	RESET/RUN from OFF to ON resets an Ended,		discrete parameter	Ready and
	Hold, or Ready program to the starting value of		& profiler is in	goes to
	segment 1 and to the profiler’s Ready state. On a		Ready or Hold or	Segment
	transition from ON to OFF, starts an Ended profiler.		End	#1.
		Falling	START is not	Profiler
	RESET/RUN does not affect a running program.	edge	programmed with a	goes to
	May be connected to the F3 key (SY1F3).		discrete parameter	Segment #1
			& profiler is at End	and starts
				to Run.

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