Block

Mask

Description

The National Instruments ESeries (or NI-60xE) cards features analog inputs, analog outputs, digital I/O lines and counters. This block is used to control one of the two counters to perform pulse width measurement (PWM)

Both the active signal level and resolution can be configured.

This block supports a list of PXI and PCI cards. For more card-specific information, please refer to NI documentation.

Parameters

Bus Type	Select the bus type (PCI or PXI) of the board in this list.
Card Type	Select the card model in this list.
Card index	Index of the card on the bus (for example, if only one card is present in the computer, enter "0" in the corresponding field).
Counter	Each NI60xE board has two counters. Select the counter to be used (0 or 1)
Clock source	Sets the counting clock of the counter to either20MHz or 100kHz. Clock selection has a direct impact on resolution.
Polarity	Indicates if the low or high level of the signal is to be measured.
Output unit	Specifies how the block is to express the measurement.If seconds are selected, the measured time will be expressed in seconds. If the duty cycle is selected, the result will be expressed as a ratio of the measured active time over the period of the signal, hence the importance of the frequency inport.
Input unit	Specifies the unit of the Freq inport (either Hertz or seconds). This parameter is relevant only if the Output unit is set to ratio.
Synchronize	see definition.
Sample Time (s)	see definition.

Inputs

Ref: This input is used to specify the frequency or period of the measured signal depending on the Input Unit parameter. This value is used to evaluate the block output should the ratio be selected in the Output Unit parameter. A convenient way of using this if the measured signal has no fixed frequency is to use a Frequency input block to provide this information.

Outputs

PWM	Returns the measured pulse width, in seconds or as a duty ratio.
Status	This output returns 1 if a new PWM measurement was completed during the previous step, it returns 0 if no new measurement was latched (the PWM output was measured during some previous timestep), and it returns 2 if we can not be sure whether the current PWM value is new or not. This can occur when the pulses to be measured are short compared to the time step, and when the period of the signal is shorter than the time step.
Since last	Returns the time elapsed, in seconds, since the last edge that started a PWM measurement.

Characteristics and Limitations

Connections Requirements

Connect the input signal to be measured to the GATE pin of the selected counter.

Connector Pin Assignments

The following table gives the description of the signals related to the counters and is followed by the connector pin assignments of the various NI E-Series card models.

Signal Name	Signal Description
GPCTRX_SOURCE	Counter clock source
GPCTR1_GATE	Counter gate
GPCTR1_OUT	Counter output
DGND	Digital ground

1) Cards NI-6070E (MIO-16E-1),NI-6052E, NI-6040E (MIO-16E-4), NI-6036E, NI-6035E, NI-6034E, NI-6032E, NI-6030E (MIO-16XE-10), NI-6024E,NI-6023E, NI-6011E (MIO-16XE-50):

68-pin I/O

Pin	Description	Pin	Description
34	ACH8	68	ACH0
33	ACH1	67	AIGND
32	AIGND	66	ACH9
31	ACH10	65	ACH2
30	ACH3	64	AIGND
29	AIGND	63	ACH11
28	ACH4	62	AISENSE
27	AIGND	61	ACH12
26	ACH13	60	ACH5
25	ACH6	59	AIGND
24	AIGND	58	ACH14
23	ACH15	57	ACH7
22	DAC0OUT	56	AIGND
21	DAC1OUT	55	AOGND
20	EXTREF	54	AOGND
19	DIO4	53	DGND
18	DGND	52	DIO0
17	DIO1	51	DIO5
16	DIO6	50	DGND
15	DGND	49	DIO2
14	+5V	48	DIO7
13	DGND	47	DIO3
12	DGND	46	SCANCLK
11	PFI0/TRIG1	45	EXTSTROBE
10	PFI1/TRIG2	44	DGND
9	DGND	43	PFI2/CONVERT
8	+5V	42	PFI3/GPCTR1_SOURCE
7	DGND	41	PFI4/GPCTR1_GATE
6	PFI5/UPDATE	40	GPCTR1_OUT
5	PFI6/WFTRIG	39	DGND
4	DGND	38	PFI7/STARTSCAN
3	PFI9/GPCTR0_GATE	37	PFI8/GPCTR0_SOURCE
2	GPCTR0_OUT	36	DGND
1	FREQ_OUT	35	DGND

2) Cards NI-6071E, NI-6033E, NI-6031E:

100-pin I/O

Pin	Description	Pin	Description
1	AIGND	51	ACH16
2	AIGND	52	ACH24
3	ACH0	53	ACH17
4	ACH8	54	ACH25
5	ACH1	55	ACH18
6	ACH9	56	ACH26
7	ACH2	57	ACH19
8	ACH10	58	ACH27
9	ACH3	59	ACH20
10	ACH11	60	ACH28
11	ACH4	61	ACH21
12	ACH12	62	ACH29
13	ACH5	63	ACH22
14	ACH13	64	ACH30
15	ACH6	65	ACH23
16	ACH14	66	ACH31
17	ACH7	67	ACH32
18	ACH15	68	ACH40
19	AISENSE	69	ACH33
20	DAC0OUT	70	ACH41
21	DAC1OUT	71	ACH34
22	EXTREF	72	ACH42
23	AOGND	73	ACH35
24	DGND	74	ACH43
25	DIO0	75	AISENSE2
26	DIO4	76	AIGND
27	DIO1	77	ACH36
28	DIO5	78	ACH44
29	DIO2	79	ACH37
30	DIO6	80	ACH45
31	DIO3	81	ACH38
32	DIO7	82	ACH46
33	DGND	83	ACH39
34	+5V	84	ACH47
35	+5V	85	ACH48
36	SCANCLK	86	ACH56
37	EXTSTROBE	87	ACH49
38	PFIO0/TRIG1	88	ACH57
39	PFI1/TRIG2	89	ACH50
40	PFI2/CONVERT	90	ACH58
41	PFI3/GPCTR1_SOURCE	91	ACH51
42	PFI4/GPCTR1_GATE	92	ACH59
43	GPCTR1_OUT	93	ACH52
44	PFI5/UPDATE	94	ACH60
45	PFI6/WFTRIG	95	ACH53
46	PFI7/STARTSCAN	96	ACH61
47	PFI8/GPCTR0_SOURCE	97	ACH54
48	PFI9/GPCTR0_GATE	98	ACH62
49	GPCTR0_OUT	99	ACH55
50	FREQ_OUT	100	ACH63

3) Cards NI-6025E