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 generate a pulse train with variable frequency and duty cycle.

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.
Active level	Indicates if the low or high level of the signal is to be measured.
Frequency unit	Specifies the unit of the frequency input (Hzor seconds)
Duty unit	Specifies the unit off the duty input, which can be expressed either in seconds or as a ratio of the active time over the period. Ex: 0.25 means the signal is active one-fourth of the period.
Minimum frequency	This parameter indicates the minimum frequency to be generated by the block. A 32-bits counter can generate a period of several minutes, should a small value appear on the frequency inport, the counter will start generating such a cycle which might be a nuisance for any application. This parameter provides protection by setting the smallest possible frequency to be generated. Still, if the value you provide here is smaller than the physical limit of the card (imposed by the clock source resolution and the 24-bit counter), the "Minimum frequency" will be reset to the latest.
Reset on pause	Specifies if signal generation is to be interrupted when the model is paused.
Synchronize	see definition.

Inputs

Freq	This input is used to specify the frequency, either in Hz or seconds (see parameters), of the generated signal.
Duty	Fraction of the period during the signal is active.Can be expressed either in seconds or as a ratio of the active time over the period. Ex: 0.25 means the signal is active one fourth of the period.

Outputs

Error: If the block cannot generate a PWM waveform with the specified "frequency" and "duty", it will output en error.

Following is a list of errors the block may output.

Error Number	Description
-1	Frequency value is less than the minimum accepted.
-2	Duty cycle is out of range.
-3	Active time is a negative value.
-4	The active time is longer than the frequency allows.
-5	Frequency and duty cycle are set to zero..

Characteristics and Limitations

Connections Requirements

The generated signal is available at the OUT 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
GPCTRX_GATE	Counter gate
GPCTRX_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