National Instruments FieldPoint FP-DIO-550 User manual

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FieldPoint™Operating Instructions
FP-DIO-550 and cFP-DIO-550
Eight-Channel Digital Input,
Eight-Channel Digital Output Module
These operating instructions describe how to install and use the
National Instruments FP-DIO-550 and cFP-DIO-550 digital I/O
modules, referred to inclusively as the [c]FP-DIO-550. For
information about configuring and accessing the [c]FP-DIO-550
over a network, refer to the user manual for the FieldPoint network
module you are using.
Features
The [c]FP-DIO-550 is a FieldPoint digital I/O module with the
following features:
• Eight digital input channels compatible with sinking, sourcing,
and differential devices
• Eight sourcing digital output channels
• Up to 30 VDC digital input
• Up to 30 VDC, 250 mA digital output
• On/Off LED indicators
•250V
rms CAT II continuous channel-to-ground isolation,
verified by 2,300 Vrms , 5 s dielectric withstand test
• Hot swappable
Installing the FP-DIO-550
The FP-DIO-550 mounts on a FieldPoint terminal base (FP-TB-x),
which provides operating power to the module. Installing the
FP-DIO-550 onto a powered terminal base does not disrupt the
operation of the bank.
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FP-DIO-550 and cFP-DIO-550 2 ni.com
To install the FP-DIO-550, refer to Figure 1 and complete the
following steps:
1. Slide the terminal base key to position X.
2. Align the FP-DIO-550 alignment slots with the guide rails on
the terminal base.
3. Press firmly to seat the FP-DIO-550 on the terminal base.
When the module is firmly seated, the terminal base latch locks
it into place.
Figure 1. Installing the FP-DIO-550
Installing the cFP-DIO-550
The cFP-DIO-550 mounts on a Compact FieldPoint backplane
(cFP-BP-x), which provides operating power to the module.
Installing the cFP-DIO-550 onto a powered backplane does not
disrupt the operation of the bank.
To install the cFP-DIO-550, refer to Figure 2 and complete the
following steps:
1. Align the captive screws on the cFP-DIO-550 with the holes
on the backplane. The alignment keys on the cFP-DIO-550
prevent backward insertion.
2. Press firmly to seat the cFP-DIO-550 on the backplane.
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.
1 I/O Module
2TerminalBase
3 Alignment Slot
4Key
5Latch
6 Guide Rails
1
3
2
4
5
6
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© National Instruments Corp. 3 FP-DIO-550 and cFP-DIO-550
Figure 2. Installing the cFP-DIO-550
Wiring the [c]FP-DIO-550
The FP-TB-xterminal base has connections for each FP-DIO-550
input and output channel, and for an external power supply to
power field devices. The cFP-CB-xconnector block provides the
same connections for the cFP-DIO-550.
Each input channel has two input terminals, IN+ and IN–. Each
output channel has one output terminal, VOUT, and one COM
terminal. All eight output channels are referenced to the COM
terminals. The C and COM terminals are all internally connected.
Connect the positive lead of the external power supply to both
V terminals and the negative lead to both C terminals. Ensure that
the current through each V terminal can never exceed 2 A.
1 cFP I/O Module
2 Captive Screws
3 cFP Controller Module
4 Screw Holes
5 cFP Backplane
2
2
1
3 5
4
4
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Install a 2 A maximum, fast-acting fuse between the external
power supply and the V terminals. The wiring diagrams in this
document show fuses where appropriate.
Table 1. Input Terminal Assignments
Channel
Terminal Numbers
IN+ IN–
In 0 1 2
In 1 3 4
In 2 5 6
In 3 7 8
In 4 17 18
In 5 19 20
In 6 21 22
In 7 23 24
Table 2. Output Terminal Assignments
Channel
Terminal Numbers
VOUT COM
Out 0 9 10
Out 1 11 12
Out 2 13 14
Out 3 15 16
Out 4 25 26
Out 5 27 28
Out 6 29 30
Out 7 31 32
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© National Instruments Corp. 5 FP-DIO-550 and cFP-DIO-550
Digital Input
The [c]FP-DIO-550 has eight current-limited input channels with
optical isolators. Each channel has two input terminals, IN+and
IN–. When the voltage across the IN+and IN–terminals is at least
11 V, signal current flows through the input and turns on the optical
isolator, and the channel is ON. The current-limiting circuitry
limits the amount of current flow to 7 mA.
When the voltage across the IN+and IN–terminals is less than 5 V,
the channel is OFF. When the voltage is between 5 and 11 V, the
channel may be ON or OFF.
The input channels are floating, which means that they do not share
a common ground reference. Make sure that there is no more than
30 V difference between any two input terminals.
Figure 3 shows the input circuitry of a single channel.
Figure 3. [c]FP-DIO-550 Input Circuit
The devices you connect to the [c]FP-DIO-550 should have
OFF-state leakage currents of less than 300 μA to ensure that
they do not cause false ON readings.
Digital Input Filter
Each input channel has a filter that can prevent electrical noise
from causing false readings. In Measurement & Automation
Explorer (MAX), you can select a value from 0 to 65,535 μs for the
digital input filter on each channel. The filter rejects pulses that are
1 μs or more shorter than the length you select. If you select 0 μs,
the filter is disabled.
IN+
IN–
Status
Indicator
Optical
Isolation
[c]FP-DIO-550
Current
Limiter
VC
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Input Latching
In MAX, you can configure each input channel to operate in either
standard mode or latch mode. In standard mode, the channel
returns a value of TRUE when the input is high and FALSE when
the input is low. In latch mode, the channel latches to one value
when it detects a specific input signal state and retains that value
until you reset the channel. The two latch modes are Latch TRUE
on high and Latch FALSE on low. If the channel is in Latch TRUE
on high mode, it returns TRUE when it detects a high input signal
and continues to return TRUE until the channel is reset, regardless
of subsequent changes to the input signal. If the channel is in Latch
FALSE on low mode, it returns FALSE when it detects a low input
signal and continues to return FALSE until the channel is reset. To
unlatch and reset the channel, send the Reset Latch command.
Note If the input signal matches the value that the
channel is configured to detect when you put the
channel in one of the latch modes, the channel latches
immediately. Similarly, if you attempt to reset the
channel when the input signal is in the state that the
channel is set to detect, the channel will not reset.
You can use input latching to detect short signal pulses that
software polling might otherwise miss.
Connecting a Differential-Output Device
to the [c]FP-DIO-550
You can connect a differential-output device to an input channel of
the [c]FP-DIO-550. Connect the positive lead to the IN+ terminal
of the channel and connect the negative lead to the IN– terminal of
the channel. Refer to Figure 4.
Figure 4. Connecting a Differential-Output Device
to One Channel of the [c]FP-DIO-550
IN–
IN+
Input
Circuitry
Differential
Output
Device
VC
+
–
[c]FP-DIO-550
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© National Instruments Corp. 7 FP-DIO-550 and cFP-DIO-550
Connecting a Sinking-Output Device
to the [c]FP-DIO-550
You can connect an externally powered sinking-output device to an
input channel of the [c]FP-DIO-550. A sinking-output device
provides a path to ground. Connect the positive terminal of the
power supply to the IN+ terminal of the channel and connect the
output terminal of the device to the IN– terminal of the channel.
Refer to Figure 5.
Figure 5. Connecting an Externally Powered Sinking-Output Device
to One Channel of the [c]FP-DIO-550
Connecting a Sourcing-Output Device
to the [c]FP-DIO-550
You can connect an externally powered sourcing-output device to
an input channel of the [c]FP-DIO-550. A sourcing-output device
provides a path to a voltage source. Connect the output terminal
of the device to the IN+ terminal of the channel and connect the
negative terminal of the external power supply to the IN– terminal
of the channel. Refer to Figure 6.
Figure 6. Connecting an Externally Powered Sourcing-Output Device
to One Channel of the [c]FP-DIO-550
IN–
IN+
Input
Circuitry
Sinking-
Output
Device
(NPN)
VC
+
–
[c]FP-DIO-550
External
Power
Supply
(30 V Max)
IN–
IN+
Input
Circuitry
Sourcing-
Output
Device
(PNP)
VC
+
–
External
Power
Supply
(30 V Max)
[c]FP-DIO-550
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Digital Output Circuit
The [c]FP-DIO-550 digital output channels are optically isolated
from the rest of the FieldPoint bank. The channels are sourcing
outputs, which means that the output terminal provides a path to
a voltage supply.
In the ON state, a transistor is turned on between the V terminal
and the VOUT terminal. 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
250 mA.
Caution Do not short-circuit outputs to C or COM
terminals. Short circuits can damage the outputs. Check
all wiring carefully before applying power.
In the ON state, the maximum effective resistance between the
VOUT terminal and the V terminal is 200 mΩ. This resistance
causes a voltage drop between the external supply voltage and the
output voltage. Table 3 lists the minimum output voltages based on
the voltage provided by the external power supply.
Table 3. [c]FP-DIO-550 Output Voltages for 250 mA Current Flow
VVOUT
10 9.95
12 11.95
24 23.95
30 29.95
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© National Instruments Corp. 9 FP-DIO-550 and cFP-DIO-550
Figure 7. Digital Output Circuit
If the external power supply you are using does not provide one of
the voltages in Table 3, use the following equation to calculate the
actual voltage output.
ActualOutput = Vext – (I0×0.20 Ω)
where ActualOutput is the voltage sourced by VOUT
Vext is the voltage provided by the external power supply
I0is the current flow through the VOUT terminal
Output Pattern Matching
Pattern match mode enables you to configure output channels to
respond directly to specific patterns of states on the input channels.
In MAX, you can configure each output channel to turn on or off
if the input pattern occurs. Also, you can configure each output
channel to latch on or off until it is reset or to update continually
based on the input pattern.
VOUT
COM
C
[c]FP-DIO-550
Optocoupler Output
Protection
V
Load
2 A
Max –
+10–30 VDC
External
Power
Supply
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