Honeywell VRX180 user manual Cems Block Average Prompts, Cems Rolling Average CEM Rolling Avg

Programming Function Blocks and Features

CEMS Block Average

Outputs a block mean average CVn OV over the specified Average Period. The average is calculated from input samples taken at equally spaced Sample Periods. All samples are discarded at the end of the Average Period and the Average Period begins again.

Samples are ignored when Calibrate Hold is ON(1). After the Average Period the new average is calculated using only the samples taken before and after the Hold. If no valid samples are taken, the output maintains its previous value.

Table 4-48 describes the CEMS Block Average prompts. See Table 4-2 for additional prompts.

Table 4-48 CEMS Block Average Prompts

Prompt	Range/Selections		Definition
RANGE LOW	OFF or number		Enter the output’s display limits. Output is not clamped or
			flashed when it exceeds these limits.
RANGE HIGH
INPUT	OFF, analog parameter, number	Input to be averaged
RESET	OFF, discrete parameter, 0, 1		When discrete is ON(1), average is reset to zero; when
			ON(1)-to-OFF(0), average restarts.
TIME UNITS	SECONDS, MINUTES, HOURS,		Time units of the averaging period
	or DAYS.
AVERAGE PERIOD	OFF or number		Number of time units per average period.
SAMPLE PERIOD	OFF or number		Number of time units between samples. Must divide
			evenly into Average Period.
CALIBRATE HOLD	OFF, discrete parameter, 0, 1		When ON(1), no samples are taken and the output is held.

CEMS Rolling Average (CEM Rolling Avg)

Outputs a rolling mean average CVn OV over the specified Average Period. Average is updated every Frame Period thereafter. Samples are taken at every scan cycle of the instrument, except when Calibrate Hold is ON(1).

Inp ut
Time	between samples	= 1 machine scan	cycle
Frame	Period
	Average Period
	First average
		Second average
			Third average

Figure 4-15 CEMS Rolling Average

Table 4-49 describes the CEMS Rolling Average prompts. See Table 4-2 for additional prompts.

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