Block

Mask

Description

This block programs one counter/timer of a National Instruments NI6602 card in position measurement mode and returns the current encoder value.

The counter is programmed in Encoder X1 mode. The Index channel of the external signal connected to the counter is supposed to be high when Channel A and Channel B are low.

The counter is reset during model initialization. During execution, it can also reset on the index pulse, or the reset can be controlled from an inport of the block.

Parameters

Bus Type	This pop-up menu enables the user to select the bus type of the target computer where the NI6602 card is installed. The options are PCI or PXI.
PCI index	Enter the PCI index (see definition)of the card on the PCI (or PXI) bus.
Counter	Specify the counter to which gate pin the input signal is connected.
Clock Source	Three clock sources are available: 100 KHz, 20 MHz and 80MHz. This selection has a direct impact on the timing precision of the measurement.
Encoder Reset	This parameter allows choosing if the counter will be reset when the index pulse is detected, or when an edge is detected at the inport of the block.
Synchronize	see definition.

Inputs

Rst	This inport appears only if the Encoder Reset parameter is set to 'On inport edge'.The reset of the counter occurs when the Rst inport goes from 0 to1 or from 1 to 0.

Outputs

Freq	Returns the current value of the encoder.

Characteristics and Limitations

Connections Requirements

Connect the channel A signal to the Source pin of the counter, the channel B signal to the UpDown/Aux pin, and the Index (channel Z) signal to the Gate pin of the counter.

Connector Pin Assignments

Pin	Description	Pin	Description
1	+5V	35	RG
2	SOURCE(0)	36	GND
3	GATE(0)	37	Reserved
4	Reserved	38	Reserved
5	OUT(0)	39	GND
6	UP_DOWN(1)/AUX_LINE(1)	40	UP_DOWN(0)/AUX_LINE(0)
7	SOURCE(1)	41	GND
8	GATE(1)	42	GND
9	OUT(1)	43	RG
10	PFI_0	44	PFI_1
11	GND	45	PFI_2
12	PFI_3	46	GND
13	PFI_4	47	PFI_5
14	GND	48	PFI_6
15	PFI_7	49	GND
16	OUT(7)	50	GND
17	UP_DOWN(7)/AUX_LINE(7)	51	GATE(7)
18	GND	52	SOURCE(7)
19	RG	53	OUT(6)
20	GND	54	UP_DOWN(6)/AUX_LINE(6)
21	GATE(6)	55	GND
22	SOURCE(6)	56	RG
23	OUT(5)	57	UP_DOWN(5)/AUX_LINE(5)
24	GND	58	GATE(5)
25	SOURCE(5)	59	GND
26	OUT(4)	60	UP_DOWN(4)/AUX_LINE(4)
27	GND	61	GATE(4)
28	SOURCE(4)	62	GND
29	OUT(3)	63	UP_DOWN(3)/AUX_LINE(3)
30	GND	64	GATE(3)
31	SOURCE(3)	65	GND
32	OUT(2)	66	UP_DOWN(2)/AUX_LINE(2)
33	GND	67	GATE(2)
34	SOURCE(2)	68	GND

Direct Feedthrough	No
Discrete sample time	No
XHP support	Yes
Work offline	No

RT-LAB Documentation

OpNI6602 Encoder