Measurement-computing UL for NI LabVIEW Uživatelský manuál stáhnout pdf (Strana 53)

Universal Library Virtual Instruments (VIs) Counter VIs

MODULO_N - In modulo-n mode, an upper limit is set by loading the PRESET register

with a maximum count. When counting up, if the maximum count is reached, the

counter will roll-over to 0 and continue counting up. Likewise, when counting

down, if the count reaches 0, it will roll over to the maximum count (in the

PRESET

DataEncoding Selects the format of the data that is returned by the counter (Binary or BCD).

IndexMode Selects which action will be taken when the Index signal is received. IndexMode

must be set to

INDEX_DISABLED whenever Quadrature is set to NON_QUAD or when

Gating is set to ENABLED.

INDEX_DISABLED - The Index signal is ignored.

LOAD_CTR - The counter is loaded whenever the Index signal ON the LCNTR pin

occurs

LOAD_OUT_LATCH - The current count is latched whenever the Index signal on the

LCNTR pin occurs. When this mode is selected, the

CIn() function returns the

same count each time it is called until the Index signal occurs.

RESET_CTR - The counter is reset to 0 whenever the Index signal on the RCNTR

pin occurs

InvertIndex Selects the polarity of the Index signal. If set to DISABLED the Index signal is

assumed to be positive polarity. If set to

ENABLED the Index signal is assumed to be

negative polarity.

FlagPins Selects which signals will be routed to the FLG1 and FLG2 pins.

CARRY_BORROW - FLG1 pin is CARRY output, FLG2 is BORROW output

COMPARE_BORROW - FLG1 pin is COMPARE output, FLG2 is BORROW output

CARRYBORROW_UPDOWN - FLG1 pin is CARRY/BORROW output, FLG2 is UP/DOWN

signal

INDEX_ERROR - FLG1 is INDEX output, FLG2 is error output

Gating If Gating is set to ENABLED (True), the RCNTR pin will be used as a gating signal

for the counter. Whenever

Gating=ENABLED, IndexMode must be set to

DISABLE_INDEX.

ErrCode Error code returned from the Universal Library. Zero if no error occurred. Use the

ErrMsg VI to convert

ErrCode into a readable string.

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Measurement-computing UL for NI LabVIEW Uživatelský manuál Strana 53