National Instruments FP-CTR-500 Manuale utente

323323B-01 June 2003

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Product and company names mentioned herein are trademarks or trade names of their respective companies.

For patents covering National Instruments products, refer to the appropriate location: Help»Patents in your software,

the patents.txt file on your CD, or ni.com/patents.

FieldPoint Operating Instructions

FP-CTR-500 and

cFP-CTR-500

Eight-Channel, 16-Bit Counter Module

These operating instructions describe how to install and use the

National Instruments FP-CTR-500 and cFP-CTR-500 counter

modules (referred to inclusively as the [c]FP-CTR-500). For

information about configuring and accessing the [c]FP-CTR-500

over a network, refer to the user manual for the FieldPoint network

module you are using.

Features

The [c]FP-CTR-500 is a FieldPoint counter module with the

following features:

• Eight 16-bit counters with individual count input terminals

• Four gate-input channels configurable as either gates or digital

inputs

• Four output channels configurable as either generic digital

outputs or associated outputs for the count-input channels

• Sinking inputs and sourcing outputs, compatible with

12 or 24 VDC devices

• Internal frequency references of 1 kHz and 32 kHz

• Internally cascadable counters

• Software-enabled 50 kHz or 200 Hz lowpass filter on

count-input channels

• On/Off LED indicators

• 2,300 Vrms transient overvoltage protection

• Hot swappable

FP-CTR-500 and cFP-CTR-500 2 ni.com

Installing the FP-CTR-500

The FP-CTR-500 mounts on a FieldPoint terminal base (FP-TB-x),

which provides operating power to the module. Installing the

FP-CTR-500 onto a powered terminal base does not disrupt the

operation of the FieldPoint bank.

To install the FP-CTR-500, refer to Figure 1 and complete the

following steps:

1. Slide the terminal base key to either position X, used for any

module, or position 8, used for the FP-CTR-500 module.

2. Align the FP-CTR-500 alignment slots with the guide rails on

the terminal base.

3. Press firmly to seat the FP-CTR-500 on the terminal base.

When the module is firmly seated, the terminal base latch locks

it into place.

Figure 1. Installing the FP-CTR-500

Installing the cFP-CTR-500

The cFP-CTR-500 mounts on a Compact FieldPoint backplane

(cFP-BP-x), which provides operating power to the module.

Installing the cFP-CTR-500 onto a powered backplane does not

disrupt the operation of the FieldPoint bank.

To install the cFP-CTR-500, refer to Figure 2 and complete the

following steps:

1. Align the captive screws on the cFP-CTR-500 with the holes

on the backplane. The alignment keys on the cFP-CTR-500

prevent backward insertion.

2. Press firmly to seat the cFP-CTR-500 on the backplane.

Alignment

Slot

Key

Latch

Guide Rails

Terminal BaseI/O Module

3. Using a number 2 Phillips screwdriver with a shank of at least

64 mm (2.5 in.) length, tighten the captive screws to 1.1 N ⋅m

(10 lb ⋅in.) of torque. The nylon coating on the screws prevents

them from loosening.

Figure 2. Installing the cFP-CTR-500

Wiring the [c]FP-CTR-500

The FP-TB-xterminal base has connections for each FP-CTR-500

channel and for an external power supply to power the output

channels and field devices. The cFP-CB-xconnector block

provides the same connections for the cFP-CTR-500. The V and

VSUP terminals are all internally connected, as are the C and COM

terminals.

Use a 10–30 VDC external power supply for the output channels.

The power supply must provide enough current to power all of the

loads on the output channels, up to 1 A per channel. Connect the

external power supply to multiple V and VSUP terminals and to

1 cFP I/O Module

2 Captive Screws

3 cFP Controller

4 Screw Holes

5 cFP Backplane

3 5

FP-CTR-500 and cFP-CTR-500 4 ni.com

multiple C and COM terminals as needed to ensure that the

maximum current through any terminal is 2 A or less.

Install a 2 A maximum, fast-acting fuse between the external

power supply and the V or VSUP terminal on each channel. Install

a 1 A maximum, fast-acting fuse suitable for the load at the VOUT

terminal. The detailed wiring diagrams in this document show

fuses where appropriate.

Table 1 lists the terminal assignments for the signals of each

channel. Terminal assignments are also listed on the side panel of

the cFP-CTR-500 and under the slide-in card on the front of the

FP-CTR-500.

Table 1. Terminal Assignments

Channel Name

Terminal Numbers

VIN or VOUT1VSUP2COM

Count Inputs

Count Input 0 117 18

Count Input 1 217 18

Count Input 2 319 20

Count Input 3 419 20

Count Input 4 521 22

Count Input 5 621 22

Count Input 6 723 24

Count Input 7 823 24

Gate Inputs

Gate 0 925 26

Gate 1 10 25 26

Gate 2 11 27 28

Gate 3 12 27 28

Inputs

Each input channel has one input terminal, VIN. Each channel also

has VSUP and COM terminals that can supply power to field

devices. You can connect the eight count-input channels and four

gate-input channels to devices with sourcing outputs. The

[c]FP-CTR-500 has sinking inputs, which means that the VIN

terminal provides a path to common.

The [c]FP-CTR-500 input channels are optically isolated from the

rest of the FieldPoint bank and have current-limiting circuitry. All

the input channels are referenced to the C and COM terminals.

When the voltage across VIN and COM is 10 V or greater, current

flows through VIN and turns on the optoisolator, registering in an

ON state for the channel. When the voltage across VIN and COM

is 6 V or lower, current does not flow through VIN and the channel

is in the OFF state.

Ensure that the sourcing-output devices have OFF state leakage

currents of less than 0.2 mA so they do not generate false ON state

readings.

Outputs

Output 0 13 29 30

Output 1 14 29 30

Output 2 15 31 32

Output 3 16 31 32

1Install a 1 A maximum, fast-acting fuse on each VOUT terminal.

2Install a 2 A maximum, fast-acting fuse on each V and VSUP terminal.

Table 1. Terminal Assignments (Continued)

Channel Name

Terminal Numbers

VIN or VOUT1VSUP2COM

FP-CTR-500 and cFP-CTR-500 6 ni.com

Figure 3. Wiring a Count-Input or Gate-Input Channel to a

Sourcing-Output Device

Figure 4. Wiring a Count-Input or Gate-Input Channel to an Externally

Powered Sourcing-Output Device

Outputs

Each output channel has one output terminal, VOUT. Each channel

also has VSUP and COM terminals that you can use to supply power

to field devices. You can connect the four output channels to

devices with sinking inputs. The [c]FP-CTR-500 has sourcing

outputs, which means that the VOUT terminal provides a path to a

voltage supply.

To next channel

[c]FP-CTR-500

+–

COM

VSUP

VIN Input

Circuitry

Sourcing-

Output

Device

10–30 VDC

External

Power

Supply

2 A max

To next channel

[c]FP-CTR-500

+–

COM

SUP

Input

Circuitry

Sourcing-

Output

Device

External

Power

Supply

(Optional)

2 A max

The [c]FP-CTR-500 output channels are optically isolated from

the rest of the FieldPoint bank and have short-circuit protection

circuitry. In the ON state, a transistor is turned on between the

positive external supply voltage (V and VSUP) and the output

(VOUT). In the OFF state, this transistor is turned off, allowing only

a small leakage current to flow. Ensure that the load on any channel

does not draw more than 1 A.

Caution For a cFP-CTR-500 operating in the 50–60 °C

temperature range, the output current must not exceed

0.75 A on any channel.

In the ON state, the effective resistance between the output (VOUT)

and the supply voltage (V and VSUP) is 0.3 Ω. This resistance

causes a voltage drop between the external supply voltage and the

output voltage. Table 2 lists the actual output voltages based on the

voltage provided by the external power supply.

If the external power supply you are using does not provide one of

the voltages in Table 2, use the following equation to calculate the

actual voltage output.

ActualOutput = Vext – (Iflow × 0.3 Ω)

where ActualOutput is the voltage sourced by VOUT

Vext is the voltage provided by the external power supply

Iflow is the current flow through the VOUT terminal

Table 2. [c]FP-CTR-500 Output Voltages for a 0.5 A Current Flow

VVOUT

10 9.85

12 11.85

24 23.85

30 29.85

FP-CTR-500 and cFP-CTR-500 8 ni.com

Figure 5. Wiring an Output Channel to a Sinking-Input Device

Configuring Count-Input Channels

Channels 0–7 are count-input channels. In FieldPoint software,

you can configure each count-input channel to operate with

attributes and commands. In the Channel Configuration dialog

box, select attributes for each channel from the Attributes menu

and commands from the Commands menu. The following sections

describe the different attributes and commands you can select

when you are configuring the count-input channels. For more

information about using FieldPoint software, refer to the

FieldPoint software help file.

Terminal Count

To set the terminal count, enter a value from 0 to 65,535 in the

Value field. The default value is 65,535. When the count-input

channel exceeds its terminal count, the count resets to 0 and

triggers any outputs associated with it. For more information about

associating outputs with a count-input channel, refer to the

Configuring Output Channels section. The count-input channel

also sends a count trigger to the next count-input channel if that

channel is set to use the previous channel as the count source.

Channel Status

In FieldPoint software, the [c]FP-CTR-500 reports one of the

following statuses: Successful or Overflow since last

read. The default channel status is Successful. If a count-input

channel exceeds the terminal count, the channel resets to 0 and

Load

To next channel

[c]FP-CTR-500

COM

OUT

SUP

1 A max

Sourcing-

Output

Circuitry

–

10–30 VDC

External

Power

Supply

2 A max

starts counting again, and the channel status changes to Overflow

since last read.

Count Source

Select one of the following count sources from the Value menu:

External Count Input, Previous Channel, 1kHzReference,

or 32 kHz Reference. Select External Count Input, 1 kHz

Reference, or 32 kHz Reference to configure the channel so that

it counts low-to-high (off-to-on or rising-edge) transitions of the

count source.

Select Previous Channel if you want the channel to count the

number of times that the previous count-input channel reaches

its terminal value and resets to 0. You can configure multiple

counters to operate as one large counter. You can slave Channel 1

to Channel 0, Channel 0 to Channel 7, Channel 7 to Channel 6, and

so on. If you select this option for all of the channels, no counting

occurs.

Gate Source

Select Gate Input 0–3 from the Value menu to associate a

gate-input channel with a count-input channel. If the count-input

channel uses one of the external gate inputs, counting is enabled

when the gate-input signal is high and is disabled when the signal

is low, as shown in Figure 6. The external device determines the

high and low intervals of the gate-input signal. If you do not

associate a gate-input channel with the count-input channel, select

Always Disabled or Always Enabled. Select Always Enabled if

you want the count-input channel to count at all times, even if there

is nothing wired to the gate input. Always Enabled is the default

value.

Figure 6. Gate Source Set to an External Gate Input

001233334566

Gate

Input

Count

Input

FP-CTR-500 and cFP-CTR-500 10 ni.com

Read Reset Mode

You can configure each count-input channel to reset each time the

FieldPoint network module reads it by selecting Reset on Read

from the Value menu. A read-initiated reset also resets any outputs

associated with the target channel. The default is Don’t Reset

On Read.

Note Read Reset mode is not intended to be used with

FieldPoint Ethernet network modules.

Noise Rejection

Each count-input channel has a software-enabled lowpass filter

that you can set to reject frequencies above 200 Hz or 50 kHz.

Select 200 Hz or 50 kHz from the Value menu to configure noise

rejection. The default is 50 kHz.

Control

You can set the Control command to increment or reset by selecting

Increment or Reset from the Action menu. The increment-control

command increases the count-input channel in value by one. The

reset-control command resets the count-input channel. The control

commands ignore the gate-source setting and gate-input state.

Configuring Gate-Input Channels

Channels 8–11 are gate-input channels. The only difference

between the input circuits of the gate-input channels and those of

the count-input channels is that the gate-input channels do not have

a programmable lowpass filter. The states of the gate inputs can

always be read as simple digital inputs on Channels 8–11.

You do not need to configure anything in software for the

gate-input channels.

Configuring Output Channels

Channels 12–15 are digital output channels. In the Channel

Configuration dialog box of FieldPoint software, you can select

attributes for each output channel from the Attributes menu. The

following sections describe the different attributes you can select

for output channels.

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